Reverse telnet to Cisco router async serial port unstable

Unanswered Question
Feb 20th, 2009

I have a 3640 Cisco router that is connected to an EF Johnson communication device's console port. The router is connected using a serial port (NM-4A/S) and Cisco RS232 serial cable.

I have configured the router's serial port to async mode (physical-layer async) and set the async line to -

transport input telnet

transport output telnet

speed 2400

stopbits 1

Using the configuration above, I manage to reverse telnet to the serial port and access to the EF Johnson's console port login prompt. I could perform some basic functions once login but when I tried to perform a file upload (into the EF Johnson device), it failed halfway.

The file uploading works fine if I connect to the EF Johnson device through a modem dial-up line. I connect a modem to the device and another modem to my PC. From my PC, I initiates a dial-up to the EF Johnson modem and logs in. The modem connection is established using 9600bps, 8 databits, 1 stopbit and no parity.

Need all the help I can get.

Thank you.

I have this problem too.
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