I have configured a serial interface on a WIC-2T on 1841 IOS 12.4(15)T5 for reverse telnet (9600 8-N-1) and connected a terminal to the interface.
(a) characters typed in a router telnet session (telnet 10.132.210.22 2002) correctly appear on the terminal screen.
(b) however characters typed on the terminal keyboard do NOT appear on the router telnet session. I know that the characters are transmitted on the line correctly (shown by line monitor).
The same problem does not occur when using the AUX port on the same router (telnet 10.132.210.22 2001) with essentially identical configuration:
interface Serial0/0/0
physical-layer async
no ip address
encapsulation slip
line aux 0
exec-timeout 15 0
modem InOut
no exec
transport input all
transport output all
line 0/0/0
exec-timeout 0 0
modem InOut
no exec
transport input all
transport output all
stopbits 1
#sh line
Tty Line Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
0 0 CTY - - - - - 0 0 0/0 -
1 1 AUX 9600/9600 - inout - - - 1 0 0/0 -
0/0/0 2 TTY 9600/9600 - inout - - - 1 0 0/0 Se0/0/0
