Cisco ISR 4431 NIM-1T Cabling Issue

[gregngng1]

We are building up a set of replacement Cisco ISR 4431's in the lab that are replacing some EOL equipment out in the field. We have the Cisco CAB-SS-449MT cables, which are the Cisco smart serial 10 foot 449 cables. In the previous routers, when this cable plugged into the serial port it showed as Cable type: RS-449 and connected. When we plug these cables into our ISR 4431 NIM 1-T serial port, the port and controller still show as down. Is this normal, as it is not how the other engineer remembers the live system working?

Thanks!

[Georg Pauwen]

Hello,

the cable is the right one, the problem is likely the network clock synchronization. Try and configure the below:

1. configure terminal

2. network-clock synchronization automatic

3. controller [t1|e1] slot/bay/port

4. clock source line primary

5. network-clock input-source priority controller [t1|e1] slot/bay/port

6. exit

Check this link for details:

https://www.cisco.com/c/en/us/td/docs/routers/access/4400/feature/guide/isr4400netclock.html