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Basic T1 CSU setup settings

Posted on 2007-11-27
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Last Modified: 2010-04-21
I'm having problems getting my T1 connection up and could use some advice...

I have the following:
1. Two brand new Cisco 1841's each with a dual port T1 card in slot 1. (not a CSU/DSU combo card)
2. Two brand new Adtran TSU ACE CSU's  2nd Gen (1202295L1) www.adtran.com 
3. A point to point T1 (DS1) connection through Verizon.
The line details are:
      B8ZS       ESF      No timing on the line - I must provide timing.

Everything is hooked up. There are no alarms on the CSU's.
I've set the timing on the CSU on one side to 'Internal' and on the other CSU I set it to 'Network'.
Verizon tested the line and said there are no apparent problems.
Cisco says both routers are correctly configured.
I talked with Adtran support and they said that I should default the CSU's and only change the timing (one internal and one network) and the settings should be correct.

The line at location #1 goes up up for a few minutes and then goes down again.
interface Serial0/1/0
 description Verizon P2P to Corporate
 bandwidth 1536
 ip address 10.160.26.1 255.255.255.252
 no fair-queue

Serial0/1/0                10.60.26.2      YES manual up                    down

*Nov 27 17:41:47.344: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0, changed state to up
*Nov 27 17:42:07.344: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0, changed state to down
*Nov 27 17:42:17.344: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0, changed state to up
*Nov 27 17:42:37.344: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/
0, changed state to down

The line at location #2 just stays down.

interface Serial0/1/0
 description Verizon P2P to Mine 83/HCGS/402895//GTEW
 bandwidth 1536
 ip address 10.60.26.2 255.255.255.252
 no fair-queue

Serial0/1/0                10.160.26.1     YES NVRAM  up                    down

What next?
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Question by:Matrix1000
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Accepted Solution

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tvman_od earned 2000 total points
ID: 20363004
Is it possible to bring both routers to your desk and connect with T1 "cross-over" cable? This would allow you to make sure that you are clear and all your equipment works or doesn't. Another test is a hard-loop on one of the sides. You use HDLC protocol which should comeup right away, when you loop the line on other side.

Thake a look at this article
http://www.cisco.com/en/US/docs/ios/12_0/dial/command/reference/drsyncs.html

Pay attention to "clock rate"  and "clock source" commands.
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Author Comment

by:Matrix1000
ID: 20384863
That ws a great Idea and I believe it worked!  I took all the gear from both locations, made a T1 crossover cable (which i didn't realize you could even do) and tested each server and CSU.. then switched the Serial cards between routers and figured out it was a bad Cisco serial card.
The bad card was brand new, but went UP UP, UP DOWN repeatedly in both routers.
I'm in the process of doing an RMA.
THANKS!
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Author Closing Comment

by:Matrix1000
ID: 31411259
Great Job!
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