In our site we have a lots of 2800 routers that host WIC-2T(1 port for normal working, 1 port for backup - it will be plugged when the 1st port fail). Those backup ports are left dusty and may not be used for years, so we can't know that if they are still in a good condition to serve the traffic or not.
Is there any fastest way to test the backup serial port without adding configuration? I'm thinking about signal tester (like a cable tester) but don't know where I can find it.
Could anybody advise the better way or any commercial interface tester that will help? Please......
Thanks in advance.