E1 Clocking Back to Back 3925 Routers.

[shaucall46]

Just to get this clear as having issues with a E1 link with CRC's at one.

Router A

Network-Clock-Participate WIC 1

Controller E1 0/1/0

clock source internal

Router B

No Network- Clock Participate WIC 1

Controller E1 0/1/0

clock source line

Telco kit is unframed and passes clocking

Should router B have clock participate for WIC 1?

We currently have controllers set as UNFRAMED but guess we can set to NO-CRC4 both ends and telco will pass this.

Any thoughts appreciated.

[mavespig]

Hi,

Is Telco providing already the clocking signal? In that case, both sides should be configured for Clock source line.

If Telco is not providing a clocking signal, then your configuration is correct. try to add network-clock-participate and network-clock-select on both sides.

If there are still CRC's, you can connect a physical loopback interface on one E1, do a ping test and verify that there are no CRCs. After that you can verify the other side.

You can use this guide as reference:

http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a008010059a.shtml

Hope this helps

Marco