Clocking for Two T-1s

[4bsmith]

I have a remote router with two T-1 controllers on separate WICs.  WIC 2 is a T-1 WAN connection back to the home office, while WIC 3 is a PRI to the telco.  I have the two configured for clocking as follows:

network-clock-participate wic 2

network-clock-participate wic 3

network-clock-select 1 t1 0/3/0

Both controllers are set to clock source line.  The other end (home office) of the T-1 on WIC 2 is set to clock source internal.

Slip seconds and serial port errors on controller/serial 0/3/0 are all zero

Slip seconds and serial port errors on controller/serial 0/2/0 are relatively high  (About 118 slip seconds per interval with many CRC errors)

My question is this: How can I cause 0/3/0 to receive clock from telco, as it does now, while causing 0/2/0 to receive clock from the other T-1 linking the remote site to the home office?  I need a means of eliminating the slip seconds and serial port errors.

[gerald.suiza]

can you post the output of sh controllers? you can also try to set the clock to independent if the WIC-MFT supports it.

[Collin Clark]

You state you have 2 T1 WIC's but you are talking about 3 of them. Can you clarify and post the config of the controllers?

[4bsmith]

Just two WICS with controllers 0/2/0 and 0/3/0.  I posted the output below.

[vmiller]

Make everything source clock from the telco. Unless you are running your own carrier level services.

Assuming every circuit is telco provided, While you see a point to point link, the service is provisioned across

any number of carrier facilites. your sites are just the endpoints. take your circuit timing from them.

[4bsmith]

Both are clocked from the telco, but there are two different telcos involved.

[vmiller]

That shouldn't matter.

Has this service ever worked error free or is it new?

Did you set the Home office T-1 to clock source line ?

What does the far end T-1 look like regarding errors & slips ?

[4bsmith]

This is a long established service.  I am new to the organization and am trying to clean up lingering VoIP issues.  The service has historically had slips.

The home office end is participating in network clock provided by Qwest and is set to internal, while the distant end is participating in network clock provided by Frontier and is set to line.

The home office T-1 has consistent zero slips and errors, while the distant end is consistently taking slips and errors.

[vmiller]

OK, Ignore the fact you have two carriers.

set the HO timing to network. right now the timing is sourced by the router.

What it looks like is your transmit from ho is just enough out of synch with the timing provided by the carriers to create slips at the far end.

[4bsmith]

Both ends are now set to line, but now both ends are experiencing slips. 

[vmiller]

Interesting.

1. I'd take one leg out for testing with the carrier, have them loop to device and test. see what they get.

    repeat the test for the other leg with the other carrier.

capture any results.

It could be at the handoff between frontier  and qwest.

[4bsmith]

Here is the output of show controllers:

T1 0/2/0 is up.

  Applique type is Channelized T1

  Cablelength is short 110

  No alarms detected.

  alarm-trigger is not set

  Soaking time: 3, Clearance time: 10

  AIS State:Clear  LOS State:Clear  LOF State:Clear

  Version info Firmware: 20090408, FPGA: 13, spm_count = 0

  Framing is ESF, Line Code is B8ZS, Clock Source is Line.

  CRC Threshold is 320. Reported from firmware  is 320.

  Data in current interval (110 seconds elapsed):

     0 Line Code Violations, 0 Path Code Violations

     15 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     15 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

  Data in Interval 1:

     0 Line Code Violations, 0 Path Code Violations

     118 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     118 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

  Data in Interval 2:

     0 Line Code Violations, 0 Path Code Violations

     118 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins

     118 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs

[gerald.suiza]

i would not ignore that you have two carriers since the carriers have different clock sources and you have participates cconfigured. what i would do is try and set them to independent on the controller. just my 2c's