[c-nsp] CT3 Timing issue

[Walter Keen]

Typically on TDM line cards, more notably on Cisco equipment, there seems to be a clock per interface (sometimes not per card). 
With carrier TDM equipment (sonet switches, etc) it's typically a clock per chassis. 



----- Original Message -----

From: "Natambu Obleton" <nobleton at fasttrackcomm.net> 
To: "Walter Keen" <walter.keen at rainierconnect.net> 
Cc: cisco-nsp at puck.nether.net 
Sent: Tuesday, June 5, 2012 3:41:57 PM 
Subject: RE: [c-nsp] CT3 Timing issue 

Yeah. We have external BITS clocks, and secondary timing from the local exchange carrier. I will try line timing after hours tonight. If I terminate the T1's the same PA-MC-T3 I don't have slips, so the PA-MC-T3 must have a clock on the card.... 

-- 

Natambu Obleton, CISSP CCNA 
Senior Network Engineer 
FastTrack Communications, Inc. 
970.828.1009 

-----Original Message----- 
From: Walter Keen [mailto:walter.keen at rainierconnect.net] 
Sent: Tuesday, June 05, 2012 3:59 PM 
To: Natambu Obleton 
Cc: cisco-nsp at puck.nether.net 
Subject: Re: [c-nsp] CT3 Timing issue 

In most cases, a topology like this will have the ONS's synced to GPS time, or some accurate clock (or line clocking if your ONS connects to another provider, but GPS is typically preferred) and then I would DEFINITELY use line clocking on the PA-MC-T3, unless you have the capability through a clock card to connect the 7204 to the same timing source as the ONS uses (ie: GPS derived clock) Whenever possible, keep all devices in sync with a common clock 




----- Original Message ----- 

From: "Natambu Obleton" <nobleton at fasttrackcomm.net> 
To: cisco-nsp at puck.nether.net 
Sent: Tuesday, June 5, 2012 2:17:54 PM 
Subject: [c-nsp] CT3 Timing issue 

Hello, 

I have a customer with a 2xT1 MPPP link to my 7204. The T1 come in to the 7204 on different PA-MC-T3 cards. The PA-MC-T3 cards plug into my ONS 15454 SONET network. When I have timing set on the CPE to one of the T1s the other T1 gets slips and vice versa. Both of the PA-MC-T3 are set for internal timing. Shouldn't their timing be the same or should I have these setup for line timing? Thanks. 

-- 

Natambu Obleton, CISSP CCNA 
Senior Network Engineer 
FastTrack Communications, Inc. 
970.828.1009 

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