35%-40% Dial-in Disconnect rate for NM16AM Analog Modems on 2610.

[s.hakopian]

I'm having problems with Dial-in connections. Everything is ok but the disconnect after about 1-7 minutes. According to the syslogs & traps the case is Lost Carrier. Sudden retains are initiated. I've checked the Earthing, the peak voltage to nol is 3-5 vpp.

Any Ideas on this, Any clues , Hints to check.

Thanks in advance.

Hakopian

hakopian@softhome.net

[jeff]

Do the lines come in as Analog (POTS) or are they derived from a T carrier (Digital) and converted?

[s.hakopian]

Yes they are Analog (NM16AM Module & POTS).

SNR is OK about 28-32.

Did you have such a case?

About every other call is disconnected from remote (Client Side, Lost Carrier).

Any suggestions.

Great appreciations.

[jeff]

If you're sure calls are being disconnected from remote client side, then I'd check the modem options. It may be a case of one of the control signals dropping. Are you using software Flow Control (Xon/Xoff) (bad) or hardware flow control? (RTS/CTS) (good) . Look at how RTS, CTS, CD, DTRetc. are optioned. You may want to nail up CTS, or ignore DTR etc.

[s.hakopian]

The same modems work with other Rases well, No disconn.

The users are out of my reach. And the flow is hardware.

The case is, all of a sudden retrain is initiated on modems i think it's because of poor line qualities.

Do you know of any line quality checking techniques to ensure of that part?

Thanks.

[jeff]

Well, there is specialized Test Equipment to check Analog phone lines, but it's not cheap. Call the Phone Company and have THEM test the lines for you!