Our telco is providing 56 t-1 across 2
channelized DS-3s. We terminate the
ds-3's into adtran atlas 800's Then we
map the T-1's out individual t-1 ports.
We connect these individual t-1's to an
8540 with C85MS-8TI-IMA's installed using
t-1 cross-over cables.
The adtran gets it's clocking from the ds-3.
The 8540 ports are clocked as network-derived
and the ima's are set to common clock.
The far end of these connections are also set
network derived and common for the ima's.
These connections then leave the 8540 on an
oc-3 to point to point atm interfaces on an
oc-3 card in a 7500 router.
We have a few t-1 connections that are stand
alone connects and not ima'd on the 8540.
These connections interrmittently go down then
come back up. Yet there are no errors registered
on the interface or its subinterfaces in the show interface.
The telco has been kind enough to to provide
hard loops at test points from end to end.
On 3 out of 4 of these no ima's I am able to
ping the local interface ip address and they
past all tests. The fourth shows interface
up but doesnt repond to the pings.
I am hoping my issue here is timing or that
I forgot a command somewhere.