I am facing problem with one Channelised E1 connectivity from Cisco 7613 router.
Sonet interface on 7613 router is configured as channelised for 63 E1s. But when we are extending one E1 connectivity toward customer router(on E1 controller card) the same is showing as "Serial Down, Line protocol down" at customer end and at cisco 7613 router "serial is UP, line protocol down" . However we have checked the LOOP from both the routers toward each other. getting the same fine from one end to other .. but still link / serial at customer router is not coming up.
Can anyone suggest... may there is any possibility of problem with configs or its purely a transmission end issue (but please rememeber that loop are fine from 7613 router interface toward customer end interface & vice-versa).