AR1220 serial interface problem

Latest reply: Sep 1, 2014 13:33:28 1702 2 0 0


I am experiencing a problem with serial interfaces connected to modems which are remotely power fed over twisted pairs. 

The serial interfaces do not detect the signals coming from the modem. I would like to know if there is a configuration for this kind of scenario.

Thanks in advance

Atair Camargo

Network Administrator

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Created Aug 30, 2014 01:29:04 Helpful(0) Helpful(0)

Do you have some simple diagrams to show the problem?
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Created Sep 1, 2014 13:33:28 Helpful(0) Helpful(0)

AR1220 serial interface problem-1545695-1

Hello, this is my basic scenario. I am experiencing a problem with the DTE router and modem connection. I use a Serial to V.35 cable. (There is no problem with the modem or the router, they work with other connections). 

I started having problems where my ISP deliveries modem NTU-R (remotely power fed equipment).

The serial interface indicates "down hard", both physical and protocol is down.

I tried some setups like "undo detect dsr-dtr" "invert receive clock", but none of them have other result. I check the serial interface with other connections and they worked perfectly.

Any ideas?

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