Terry Kennedy wrote:
A few revisions back, can't remember how far, the dsp code started to allow setting of the transmiter power levels. This was under line interface options, transmitter level (-db), the same as the quads used to have. They also had the same -11db setting as the quads did. I have had better luck with the quads ( and some old analog multitech modems ) by lowering the power level to -13db. It helped two different problems, disconnects and the long training sessions that never would connect. I was about to start changing these levels to -13db when I noticed that 3com has changed the default setting from -11db to -10db in 2.0.51. In all previuos releases they were set at -11db. Anyone out have any input on this? Does anyone know how to get measurements from the ct1s to determine what the correct level should be?
I changed our DSP's to -13db when I read the following in the release notes for 2.0.81 <quote> Adjustable Transmit Level Adjustable transmit level provides the ability to configure the modems for optimum performance. Ranges: -3 to -30 dBm for digital T1 line sources. A setting of -13 dBm (S39=13) is recommended for calls over digital lines (T1 or PRI). </quote> We have seen no ill effects from this setting. We had problems with what you describe above, long training sessions that wouldn't connect. I don't know yet if this setting has made an improvement. What I would like to know is why the recommended setting is not the default setting? - To unsubscribe to usr-tc, send an email to "majordomo@xmission.com" with "unsubscribe usr-tc" in the body of the message. For information on digests or retrieving files and old messages send "help" to the same address. Do not use quotes in your message.