Bosch Building Technologies

    Showing results for 
    Search instead for 
    Did you mean: 

    IP-223 has Intermittent PTTs in Tone Mode


    What are some reasons I get intermittent PTTs in Tone Mode with Analog Consoles and IP-223‘s?



    When using a legacy console with RoIP transport, under certain conditions PTT activation at the radio end (Tone Mode IP-223) may not be consistent. There are two main reasons this can occur:

    Signal level into the tone remote panel or tone controlled radio is too high or too low. Both insufficient signal level, or excessive signal level can cause the decoder to become unreliable. Increasing or decreasing the level into the decoding device may reveal the optimum set point. Ideally, the set point should be centered in the decoding signal “window”. This point may vary from one decoder device to another.

    Doubling of the LLGT. If the Console Mode IP-223 does not have the PTT Notch filter on, a 2175 Hz sine wave is sent out with the console audio. At the radio end the Tone mode IP-223, a second LLGT tone is added. The constant variation in phase of these two beating signals will cause problems with intermittent decoding. Only the Tone mode IP-223 should be generating the LLGT. Be sure the Console mode IP-223 has the PTT Notch ON.

    © 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.


    Version history
    Last update:
    ‎04-08-2020 07:00 PM
    Updated by:
    Labels (1)