[c-nsp] Possible T1 clocking problem.

[Jay Hennigan]

On 4/17/12 11:46 AM, Joseph Mays wrote:
> We're setting up an HDSL4 t1 across two copper pairs. This is the first time I've ever turned up a T1 that was not telco provided. The smartjacks show the T1 as up (and extremely good quality, actually, strong signal and not a single bit error). On the CO side the T1 goes to a T3 multiplexer which is plugged into a channelized T3 card in an AS5400. On the remote end the T1 is plugged into T1 WIC in a 2600.
> 
> Both ends show the T1 interface up, line protocol is down. Encapsulation is PPP, but all I ever see are errors. I've confirmed the wiring and every other aspect of the physical layer.
> 
> Here is the show interface info from the AS5400 6 minutes after clearing counters on the interface.

Clocking problems will usually come up but show slips.

Things to check:

Framing - B8ZS throughout (including the mux ports)?
Linecode - ESF throughout?

And a fat-finger that had us going for a while, staring at it wasn't
immediately obvious...

"timeslots 24" isn't the same as "timeslots 1-24".  :-)


--
Jay Hennigan - CCIE #7880 - Network Engineering - jay at impulse.net
Impulse Internet Service  -  http://www.impulse.net/
Your local telephone and internet company - 805 884-6323 - WB6RDV