Critical Communications: Dispatch

Question   How do I connect to a Vertex Standard VXR-7000 Repeator?   Answer   See attached             © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How do I change Zones/Channels on a Kenwood radio with Telex Dispatch products?   Answer   The Telex Consoles do not have the ability to directly change zones on a radio, this would be done in either the IP-223 or IP-224. The frequency you select on the console would correspond to the F-Tone on the Per Line Setup page in the IP-223/4. In that same section look at the far right hand side and you will see two columns labeled System and Channel. The System column is the zone that you want the radio to change to when the console selects that channel. In turn the IP-223/4 will also change to that channel in that zone. So in practice let’s say the IP-223/4 has F1, F2, F3 set to zones 1,2,and 3 for the channels 1,2,3 respectfully: Now if this is submitted and saved to eeprom, the IP-223/4 will now change channels to zone 1 channel 1 when the IP-2002 selects F1. If the console selects F2 then the radio will change to zone 2 channel 2. If the console selects F3 then the radio will change to zone 3 channel 3.         © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How do I troubleshoot audio noise with High Powered Control Stations?   Answer   When using a high power transmitter connected to the IP-223, such as a 100 watt base station, electrical noise can be a problem when the station un-keys.  What can be done to diagnose and resolve the problem? Provide the IP-223(s) with a power supply that is electrically isolated from the transmitter. Properly ground the IP-223 Keep power leads away from audio lines Use double shielded coaxial cables Be sure the antenna is as far from the equipment rack as possible Make sure the power leads to the transmitter are of sufficient size for the current draw         © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   What are possible causes of poor audio in Telex Radio Dispatch Systems?   Answer   Telex Radio Dispatch systems have operating requirements which need to be established and verified, in order to insure good quality audio across a system.  Here are some fundamental parameters that installers and technicians need to be aware of, which, if not properly ascertained, may be causes of poor quality audio in the system: Levels are a foundational issue with Telex radio systems. Improper digital audio levels are one of the most common defects that impair system audio quality. This means that the digital transmit audio and digital receive audio must be “proportional.” “Proportional” means that the sampling and conversion of the analog signals must be in the proper binary value “window.”  Generally this would be indicated by a VU Meter bar graph deflection of about 2/3 to ¾ scale at voice peaks. Improper digital audio levels are the result of improper analog levels going into the CODEC. Digital audio that is too low or too high will degrade re-constitution of digital back to analog audio at the end points. The Telex “VU Meter” program allows measurement of the digital audio levels at different points in the network, (see the Knowledge Base articles on Optimal Analog to Digital Conversion in the IP-223, and Telex Dispatch VU Meter Program.) VU Meter gives a graphic and numeric indication of digital sampling with multicast traffic. Microphones The quality of the transmit audio of the entire system depends heavily upon the quality of the signal originating from the microphone.  The microphone is where the “tires touch the road” in the system, and a poor quality microphone cannot be compensated for by any external means. The highest quality radio system will not sound good if the microphone is of poor quality, improperly adjusted, or improperly used.  The microphone is the last component in the system that should be a low price based selection. Poor microphone audio is often caused by improper use of the microphone, or the wrong type of microphone for the application.  Without a doubt, the headset mic is the best choice for any dispatching application, whether pubic safety, or not. The headset mic is always at a consistent distance from the dispatcher’s mouth, and the close proximity minimizes background noise, and promotes a very consistent voice transmit level.  Keep in mind that although some dispatchers do not like to wear headsets, no other type of mic will produce as consistently good sound quality as well as a headset mic. Desktop and gooseneck microphones are designed to be used at a specific distance from the dispatcher’s mouth, and when that distance is exceeded, audio quality degrades, and more background noise is picked up along with the voice.It is common to find a desk mic used at a much greater distance than intended, and this creates less than optimal voice audio quality. Obviously, a microphone gain setting that is too high can also create a similar problem, with excessive pickup of background noise, and excessive voice amplitude. Too low of gain setting, and the voice amplitude will be too soft and accompanied by noise. Again console mic audio in a RoIP system is adjusted by watching the VU Meter deflection at the console, using a loud talk test. Once the best deflection is attained, further gain adjustments at the radio end ensure proper transmitter modulation, and optimal audio quality. Voice peaks are a recommended reference point for calibration. Tones may not be as accurate for modulation calibration, as digital conversion does not reproduce single frequency sine waves as well as voice modulation. Control Stations Control station radios need to be run across the test bench to insure that they meet all performance specifications. Once installed on site, transmit modulation levels need to be re-verified, once the overall system alignment is completed. Mic Jack Audio Some radios use the mic jack as the TX audio interface. Be aware that such low level signals are susceptible to local sources of electrical noise, and shielded cables should always be used. RF Most installations use multiple control stations in a single rack or shelf arrangement. RF leakage can infiltrate wiring of all kinds, so it is important to minimize any radiation that may occur in the vicinity of the system equipment. Keep lead lengths as short as possible. Using outside antennas located as far away from equipment as is possible is important, especially when using high power base stations. Use double shielded RF antenna cables to insure that minimal RF radiation is occurring locally at the rack. iDen phones and similar can generate all kinds of pulse mode interference, especially if the antenna is not cabled to an external location. A loose antenna cable connector can create a lot of RF radiation near the radio. When in doubt, shield everything and make sure connections are tight. Amplified speaker cables and microphone cables are very susceptible to pulse mode RF interference. High Noise Floor Areas For example, if you are planning a power company dispatch center installation, and you have 345,000 volt transmission power lines next to the building, you may have a noise problem. Similarly, areas near commercial radio and television broadcasting towers may also have a very high RF noise floor that must be considered. Control station interfaces should be located out of the area of these types of noise sources if possible. If installation away from these noise sources is not possible, extra care should be used to shield all wiring.  Faraday shielding is the best method of eliminating electrical noise induced from radiating sources. Noise Present via Supplied AC Power Variations and transients in AC power can contribute to system noise. Using UPS power supplies or power conditioners can help eliminate AC power noise present on the supply lines. Verifying that the equipment room supply outlets are properly wired and correctly grounded is good practice. Improper grounds can be a significant factor in noise. Telex equipment should always have case grounds installed. DC Power Telex equipment in racks should have a common DC power supply, rather than each one on a separate power supply. A power supply plugged into an improperly grounded outlet will almost always cause AC noise. Network Network topology can cause VoIP audio problems if there are bandwidth restrictions, or if shared services are causing packet queuing, or data collisions. If operating on a shared network, use VPN Tunnels. Many Telex customers have had good results with products such as DCB (Data Communications for Business) tunnel boxes.           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How do I set up an IP-223 for BCD Channel Control?   Answer   Many radios are capable of being channel steered via external BCD (Binary Coded Decimal) control. The IP-223 is capable of generating BCD channel control via the bit lines at the DB-25 connectors. The BCD outputs are controlled by the F-Tones generated from the console, and are specified in the F-Tone tables, in the Per Line Settings of the IP-223. BCD bit lines are assigned to the DB-25 pin numbers as follows: 8 -   Dig 0 21-  Dig 1 9 -   Dig 2 22 – Dig 3 10 – Dig 4 23 – Dig 5 20 – Dig 6 The range for the digital output number is 0 to 128, as shown in Table 16, on page 161 of the IP-223 manual. Using pin 20 for COR limits the range to 0 to 63. Assignment of the BCD output values are accomplished in the Per Line Settings page of the IP-223, shown in Figure 1 below. Enter the desired numeric values for each F-Tone in the Digital Output column, (some applications may require the entry of the compliment of the channel number.)  Set IP-223 jumper J8(Line 1) and J30(Line 2) for the appropriate pull up voltage (+5, +12, or floating.) To verify operation of the BCD control, measure the voltage on the LSB bit line, D0, and watch for state changes as the F-Tone number is changed.   Figure 1 - Function Tone Set Up in Per Line Parameters           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How do I deal with IP-223 "False Transmit Keying" in 2 Wire Console Mode?   Answer   IP-223s in Console mode, when used with a 2 wire configuration, are known to be suseptible to decoder falsing (the decoder thinks it is receiving a Transmit tone burst) when receiving high level receive signals.  This makes the IP-223 momentarily shift from Receive Mode to Transmit Mode.  The short burst of transmit audio not only causes noise on the channel, but often causes the transmitter to actually change channels, which results in dispatch traffic accidently being broadcast on incorrect channels. Two wire mode is susceptible to this because the transmit and receive audio are on the same pair of wires, and so the decoder is exposed to the receive traffic as well as transmit traffic from the console.  Voice frequencies of approximately 1950 Hz and above, with signal levels approaching 0.0 dB peaks at the input of the IP-223, can trigger this phenomenon. Resolution Changing the configuration of both ends of the circuit to 4 wire will eliminate the problem.  When 4 wire conversion is not available, a reduction of receive audio level into the radio end IP-223 should minimize, if not eliminate the problem.          © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How do you convert Voting Systems from Analog to IP Based with Telex Equipment?   Answer   Conversion of an analog voting system to IP transport is a common mode of system upgrade being successfully done in many locations.  Careful consideration must be given to several aspects of the change in the system configuration in order to achieve good results. The first consideration is planning the network topology to have minimal bandwidth constrictions and packet delays. Ideally, packets moving across the network carrying audio will need to have the most logically direct path possible from port to port…ideally an isolated flat network. The network should be designed with enough bandwidth so that all lines of the IP-223s should be able to function simultaneously without restrictions. It is necessary to configure network timing parameters so that all receiver audio traffic arrives at the voter with nearly the same propagation time, regardless of which receiver site it originates from…something on the order of plus or minus 10 ms. Some latency is acceptable, as long as it is virtually uniform, from all sites. Obviously the audio level characteristics from each receiver site would also need to be matched as closely as possible. Analog audio levels need to be very consistent from site to site. Example: GE Analog Voter system conversion to IP based audio: A typical GE “valley voted” system uses a 1950 Hz status tone to determine when receive traffic is present, and that the receiver and transmission line are functional. The status tone is continuous when no signal is present. The voter cards also use the status tone for line level compensation to provide consistent audio levels regardless of which line is in use. Status Tone Transmission A continuous status tone cannot be used with the IP-223, as packets from receiver to receiver will become largely out of sync over time. Also the CODECs are designed for voice audio rather than a continuous tone and thus a tone will have distortion. One possible workaround is to generate the 1950 Hz locally, just ahead of the voter, and gate it with received audio from the IP-223. A circuit would have to be installed at the voter that generates the status tone the voter is looking for, and passes voice audio during receive activity. Such devices are available from third party vendors. The second change needed to the voter system would be to re-configure it for “vote and hold”, rather than continuous voting during mobile PTTs. The first receiver voted locks in until the mobile PTT drops. This avoids problems that would occur with continuous voting, which can create echoes from audio streams not being in sync.           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How can I troubleshoot IP Console and Gateway Audio Transport across a network?   Answer   On initial set up of a console system, often the most frequent problem is the failure of Consoles and IP-223s to communicate across the network.  Common causes of this are: Typos in addressing, such as multicast addresses and port numbers not matching on end to end devices. Firewall turned "ON" in console computers Multicast being blocked across the network due to router settings, etc Use of the Telex “VU Meter” program (download at http://www.telex.com/us/dispatch/file?i=97544&lg=eng) is an excellent and quick way to determine if data is present on the correct port numbers. Open VU Meter with the appropriate multicast address and port number entered in the blanks. Turn the program on. Send a test call on the TX or RX port numbers and see if VU Meter indicates digital audio activity. You may open multiple instances of VU Meter to simultaneously monitor TX and RX port numbers.  Verification that audio data is being sent out on the correct address, but not arriving at the far end of the network may indicate a problem with network configurations, that is, blocking of multicast traffic. Please note that some newer switches are intelligent enough to contain routing functions, which can be unintentionally enabled in some situations.           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How are IP-223s interfaced with Tone Controlled Radios?   Answer   In 2 wire mode the wires are connected to the DB-25 connector at pins 13 and 25. In 4 wire mode the TX pair is connected to DB-25 pins 13 and 25, and the RX pair is connected to pins 12 and 24. The corresponding radio connections will be specified by the manufacturer. Some models have built in tone remote adapter boards, and some may require a tone remote adapter board between the IP-223 and the radio.           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How can I integrate a legacy analog console into a Telex RoIP system?   Answer   Legacy TRC (Tone Remote Control) consoles send analog voice and signaling tones down copper pairs to control remote radios.  In a system conversion from copper to RoIP, the IP-223 is able to convert the console signals into data, which is sent across the network to a far end IP-223 in Tone mode. This IP-223 re-constitutes the data back into analog signals, and sends them to the tone remote adapter/control station transmitter.  (The console end IP-223 must be configured for Console mode to perform this conversion) Receive audio is likewise digitized by the radio end IP-223, and sent across the network back to the Console mode IP-223, which again converts the data back into analog audio that is played back as console receive audio. Configuration of the IP-223s Note: Jumpers MUST be configured correctly for the unit to work.  An incorrect jumper setting can waste hours of unnecessary troubleshooting time.  Consult your application notes and manual to determine the correct jumper settings for your application. We recommend that you double check them. It is also important to be sure that the Console mode IP-223 2175 Hz PTT Notch filter is ON.  This prevents two sets of 2175 tones being sent to the radio end of the system (one from the Console mode IP-223 and one from the Tone mode IP-223), which will create a beat frequency, and thus create impossibly unstable tone decoding. Crossover: When converting a legacy tone console to a Telex RoIP system, it is necessary to connect the console outbound audio (TX pair) to the IP-223 RX pair (dB-25 pins 12 and 24), and the console inbound audio (RX pair) to the IP-223 TX pair (dB-25 pins 13 and 25). Software Settings The Parallel Console checkbox in Per Line settings must be checked when using Console Mode. All Function Tones that will be used need to be enabled. Tone and Frequency durations, frequencies and magnitudes must match the radio end TRC decoder requirements Connection in 2 Wire or 4 Wire? If a choice of 2 Wire or 4 Wire configuration is available, there is no doubt that 4 Wire is the best option.  With separate TX and RX audio paths, the possibility of  random loud RX signals audio causing TX decoder to falsely recognize as a TRC tone burst, is eliminated.  This problem is commonly manifested by erratic momentary mode changes from RX to TX modes while receive traffic is active.  This can even cause the radio to change channels randomly as decoder thinks it is supposed to change channels. 4 Wire also normally provides better audio quality and more stable levels over time, especially when long runs of copper leased lines are used, and the false decoding issue is not a factor in 4 Wire.  Figure 1 - Tone Remote Control (TRC) Burst Level setting Most consoles use standard TRC levels and frequencies based on a LLGT (Low Level Guard Tone, sometimes called Hold Tone) of -20 db.  The voice audio portion of the signal normally occupies a level window of approximately -20 to 0.0 dB. Motorola consoles often use a slightly lower TRC level window…a LLGT of about -30 dB.  The voice window will also be correspondingly lower.  This will require a slightly lower LAM level setting in the IP-223 than the typical -35 dB.  The IP-223 is normally able to work reliably with a Motorola legacy console if aligned carefully. If you are unable to obtain consistent TRC keying, verify that your console is sending standard tone frequencies, durations and levels that match what the radio is expecting. Dead key the console (PTT with no voice) and measure the LLGT with a Transmission Test set or TIMS Test Set on the console TX pair.The LLGT should be stable at approximately -20 dB, or with some Motorola consoles, -25 dB to -30 dB.  Adjust accordingly to present this level to the input of the IP-223. Perform a loud voice test and see that the peaks do not exceed approximately 0.0 dB.  The IP-223 should consistently display “CTX F1” at all voice levels from quiet to maximum peak.If the levels peak at greater than 0.0 dB, the IP-223 “CTX F1” display may drop out.  This can be caused by excessive peak levels at the input of the IP-223 CODEC.  If this happens, slightly reduce the input level.The IP-223 gains may be adjusted via software, or a hardware pot. It is good practice to do a quick check of the digital output level going out onto the network with the Telex “VU Meter” program.  The bar graph deflection should be peaking in the range of about ½ to ¾ of full scale. Transmitter deviation should be checked for correct values with a console voice test.  Receive levels should be in approximately the same level range as transmit, to provide acceptable volume at the console.           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How can I better understand IP-223 jumper settings?   Answer   IP-223 jumper settings allow a great deal of flexibility in regards to the range of uses for the device.  Correct jumper settings are critical to every application.  Although many Telex application notes specify the required jumper settings for certain types of radio models, some radios are not covered and the technician must determine which settings are correct for their particular application. Explanations on the purpose of the settings are expanded upon here to assist in determining the best configuration.  Refer to the jumper chart in the IP-223 manual to idenfity specific jumper numbers based on the PCB revision.  2 Wire vs. 4 Wire Four wire mode consists of two pairs of conductors, one for TX, one for RX.  In the 2 wire form, the TX and RX signals are summed onto the same wire pair, which conserves resources but can also create problems in certain circumstances, and is generally more difficult to obtain a stable alignment with.  4 wire mode generally produces better quality audio than 2 wire mode. Balanced vs. Single Ended Locally controlled mobile radios are typically high impedance, single ended input and output lines.  Single ended refers to an unbalanced signal pair, in which one conductor is grounded and the other carries the AC signal above ground potential.  Radio audio impedances are generally considerably higher than 600 ohms, and may be 10K or greater.  Balanced audio refers to two conductors that provide forward and return paths, neither of which is referenced to ground.  Check specifications on your radio to determine which mode of connection is applicable. RX Input Impedance RX impedance may be 8 ohms, 600 ohms, or 10K ohms, depending on the source used.  A connection to a speaker for example would be 8 ohms.  Again, check the radio specifications to confirm the optimal value to be used. TX Output The transmit output level range has two options:  High or Low.  High is the most common value, but low may be required in certain systems requiring lower output levels.  Digital I/O Pull Up Voltage This jumper determines the pull up voltage for BCD (Binary Coded Decimal) channel steering bit lines.  It may be set for +5 volts, or floating (jumper set to hang on center pin).  This setting is determined by the radio requirements.  This jumper is only applicable to radios requiring BCD control. J23 This jumper needs to stay in the "B" position.  (It is intended for a future feature in the IP-223)           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How do you troubleshoot parasitic RF problems in Telex RoIP equipment racks?   Answer   In some installations, stray RF energy can infiltrate audio lines and data lines, causing erratic operation of RoIP devices. Certain modes of radio frequency transmission can be especially prone to causing interference. Pulse type modulation that occurs in cellular TDMA systems, certain types of trunking system modulation, as well as high power transmitters, are common sources of problems. For example, a typical symptom of this phenomenon is PTT dropout. When the transmitter comes up to full power, it’s controlling IP-223 may drop the PTT, as a result of RF getting into the data stream and corrupting it. Eliminating locally radiated RF energy is the first step in determining the cause of the problem. Put a dummy load on the transmitter and retest it. If the problem ceases, chances are you have found the problem. Steps can then be taken to eliminate radiation of the RF from cables, nearby antennas, etc. In this case the antenna was too close to the equipment rack, and once it was mounted further away, the problem disappeared.   Similar procedures can identify other sources of radiating RF energy as the cause of the problem. Antenna cables with poor grounds, bad connectors, cables being too close together, etc, can cause simillar problems.           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   What do the modes of operation support?   Answer   The IP-223 is capable of six different modes of operation.  Here are some explanations to help you understand the basics of how each mode works: Console Mode - Console mode is used to adapt an analog, tone controlled console so that it's signaling and voice audio can be transported across an IP network.  At the far end (radio end) of the network, a second IP-223 converts the data back into analog voice and regenerates the analog MSK tones.  The radio end IP-223 (in Tone Mode) can control a tone remote adapter panel, or tone controlled radio.  The radio end IP-223 is also capable of controlling a radio locally.  (See more on Local and Tone modes below)  The Console Mode IP-223 also converts receive packets back into analog audio for the receive side of the console radio traffic. Note: Console mode also supports E&M input logic to generate remote radio keying when control tones are not present.  Tone Mode - A Tone Mode IP-223 normally controls a radio at the remote end of the network.  It receives data from the network that originates from IP console or an analog tone generating device, such as a legacy console connected to an IP-223 in Console mode.  The IP-223 at the radio end of the system converts the digital IP information back into voice and tone signaling, which drives a tone remote adapter, or tone controlled radio.  Receive audio is also sent back to the console in a similar manner. Local Mode -  This mode is normally used at the radio (remote) end of the system and controls the radio with PTT, COR, TX and RX audio, via a direct connection to the radio auxiliary connector.  In some systems, channel control is used via the IP-223 BCD logic or by using serial control methods. Phone Mode - Phone Mode allows the IP-223 to interface to a POTS line via a Telex TDI adapter.  It allows basic telephone line functions to be provided through a C-Soft console. iDEN Mode - iDEN mode allows the IP-223 to interface with a Falcon class POC (Push to Talk over Cellular) mobile phone system.  An NI-223+ is required to interface the radio handset with the IP-223.  The radio can be operated as a cellular phone, or POC phone. TETRA Mode - TETRA Radio Mode Tetra Radio Mode allows interface to the Sepura SRM-2000/3500 mobile radio.  Similar to the iDEN Mode, the TETRA radio can be operated as a POC mobile, or cellular phone.             © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   I'm having issues trying to transport MSK (MDC or FleetSync) data across IP links (IP-223 to IP-223), and only works half the time reproducing the MSK at the far end - what can I do to fix this?   Answer   There is no good answer to your question - when you look at Audio sampling rates, VOCODER algorisms/compression rates, audio packetizing for network transport, physical network transport and the regeneration of audio, these all play a part in the units ability to recreate inserted audio at the far end of IP transport.  The operation you require is not supported, we only decode MDC in the IP-223 and display it on consoles as a special ANI packet because of these known issues.             © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   What EFJohnson radios can the IP-223 serially control?   Answer   The IP-223 can control the following EFJohnson radios: 5300R and 5300ES. Serial control of these radios is accomplished when using the IP-25300 interface in addition to the IP-223. The IP-25300 will interface with the radio and connect to the IP-223 as a RS-485 serial converter. The radio features controlled are listed below: Monitor Clear/Secure operation Radio PTT ID for incoming calls are decoded and displayed on the console. EMERGENCY PTT ID for incoming calls are decoded and displayed on the console.   Please note that with the EFJ5300SLES radio requires a special pig tail connector for proper operation. You'll need to purchase from EFJohnson: P/N 5975357-746-01 - Description- Accessory Pigtail Connector.         © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   What Kenwood radio features can the IP-223 control?   Answer   The IP-223 supports basic channel change, TX/RX audio and PTT  for most radios.  We also offer serial control of some Kenwood radios (TK-x80, -x90, -x150, -x180 and TK-5x10) that enable additional features listed below. ANI Channel Change (up to 99 frequencies) Scan ON/OFF Emergency Decode ***Scan Mode channel update*** Only on x150/x180 and TK-5x10 **Add/Delete channels from scan list** Only on x150/x180 The following optional Telex cables can help speed installation: • P/N F.01U.117.822      Description IP223CAB150/180 - IP223-Kenwood TK-150/180 and TK-5x70 cable. • P/N F.01U.117.823    Description IP223CAB90 - IP223-Kenwood TK-90 cable. If attaching two (2) serially controlled devices to a single IP-223, a serial port splitter cable is required: • P/N F.01U.117.818    Description IP223DB9Splitter - Serial Port splitter cable DB-9.         © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   Multicast doesn't seem to be working on my Telex Dispatch system - What are good next steps to troubleshoot for possible network issues?   Answer   The problem can come from many reasons, the two most common are the following: 1. The TTL value entered isn't high enough for the number of router hops and Multicast packets are being pruned by the network before reaching the end point unit.  Try increasing the TTL value. 2. By default WAN or Layer 3 networks will not pass multicast traffic, a good next step to test overall port number addressing.  Configure a number of devices for "point to point" Unicast instead of "point to multi-point" Multicast: Enter the IP address of the far end IP unit into the Multicast address field of the local IP unit.  Do this for both ends. If console and radio traffic now work using Unicast the network is not configured correctly for Multicast traffic and you need to work with the IT manager for resolution.          . © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How do I program the IP-223 to operate in TONE mode?   Answer   Programming the IP-223 to operate in TONE mode. First set jumpers for either 2 or 4 wire operation, open unit. For either 2 or 4 wire set J3, J9, J11, J16 and J21 (Line 1) or J19, J20, J25, J28 and J29 (Line 2) to "B" position. For 2-Wire set J33 and J34 (Line 1) or J5 and J6 (Line 2) to "A" position, set J14 (Line 1) or J24 (Line 2) to "B" position. For 4-Wire set J33 and J34 (Line 1) or J5 and J6 (Line 2) to "B" position, set J14 (Line 1) or J24 (Line 2) to "A" position. Close unit   Now connect your 2 or 4-Wire control line to the correct IP-223 DB-25 I/O port. For 2-Wire connect the (TX/RX) wires to Pins 13 and 25 For 4-Wire connect the TX (Out to radio) wires to Pins 13 and 25, connect the RX (In from radio) wires to Pins 12 and 24. Once your jumpers and wire connections are set you will need to place the IP-223 line into Tone mode. To do this, follow the steps below.      Log into the web page of the IP-223.      Click on the Multicast address setup picture at the top of the page.      Use the Line Type drop down for line 1 or line 2 and set it to TONE mode.      Now Click on the Submit button at the bottom of the page.      Now click on the Save To EEPROM and click on Save Parameters.      Now that line of the IP-223 is set to TONE mode will emit PTT tones. The next steps you need to take is to set levels. You will need a alignment handset to help you. If you do not have one then you may use C-Soft to key up the IP-223. Once you have the IP-223 keying up then you can now set the levels. To set levels do the following:      Using a transmission test set or similar device, measure the audio on the TX pins of the IP-223      Using a small screw driver, adjust the TX pot on the front of the IP-223 for the line under test.      Set the Low Level guard tone to the level you desire, typical is -20dbm into a loaded circuit.      Key up the IP-223 with C-Soft or the handset, measure the voice audio on the TX pins of the IP-223, typical is 0dbm peaks into a loaded circuit.     You should see the radio key up when you PTT from C-Soft or the handset.           © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   What does Dispatch products due in the cases of missed packets (lost due to jitter or errors)?   Answer   The products have a jitter buffer that allows for packets to be reordered if delivered out of sequence, if this buffer empties due to lost packets the unit will stop and restart once the "Packet delay before playback" buffer is filled.    The product looks at the source and destination address, when a correct incoming port number is recognized the unit will lock in on that source address and ignore packets coming from another source address until the first source stops sending then the second source has access. There is no protection against multiple packets from the same source address with the same multicast and port numbers as this shouldn't happen.  Add to this the same sequence bit in the packet (echoes) should never be allowed. Packets not received or lost before their play sequence (bit) time in the buffer are lost and next packets in the buffer pulled in.             © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.  

Question   How much current and voltage does the IP-223 have on the digital output pins?   Answer   The IP-223 has jumpers (J8 for line 1 and J30 for line 2) to set the output voltage of either 5V DC (A position) or 12V DC (B position). Its current through 10K resistor is 1.2mA at 12V DC or 0.5mA at 5V DC.             © Copyright Bosch Security Systems All rights reserved. Text, images, graphics, sound, animations and videos as well as the arrangement of the same in Bosch offline knowledgebase (help file) are protected by copyright and other intellectual property rights. The content of these offline knowledgebase may not be copied, disseminated, altered or made accessible to third parties for commercial purposes. Some Bosch web sites may also contain text, images, graphics, sound, animations and videos subject to third party copyrights. Warranty Note This information is provided by Bosch Security Systems ''AS IS'' and without warranty of any kind, expressed or implied, including (but not limited to) any implied warranties of merchantability, fitness for any particular purpose or non-infringement. While the information provided in believed to be accurate, it may include errors or inaccuracies. Bosch Security Systems will not be liable for any damages of any kind arising from use of this tool, including, but not limited to, direct, indirect, incidental, punitive and consequential damages.