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# Demark Wiring bonnded t1

Posted on 2008-10-30
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Hi Experts
Qwest installed 2 bonded T1's. At the demark there are 4 rows of terminals (4 each)
Circuit 1
Yellow/Black/Red/Green
Yellow/Black/Red/Green

Circuit 2
Yellow/Black/Red/Green
Yellow/Black/Red/Green

I have a cable with 1and 2 for receive and 4 and 5 for xmit
My question is which terminal (Yellow/Black/Red/Green) do I connect 1and 2& 3 and 4?

Thanks!
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Question by:5wa2
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LVL 57

Expert Comment

Should be:

Red = 1
Green = 2
Yellow = 4
Black = 5
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Author Comment

Thanks giltjr
So to recap the connections should look like this?
Circuit 1
Yellow/Black/Red/Green       1
Yellow/Black/Red/Green       2

Circuit 2
Yellow/Black/Red/Green       4
Yellow/Black/Red/Green      5

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LVL 57

Accepted Solution

giltjr earned 500 total points
No, a single T1 has four wires.  Without knowing exactly what DMARC equipment you have it shuld be more like:

Circuit 1
Yellow/Black/Red/Green connect 4/5/1/2

Yellow/Black/Red/Green  connect nothing

Circuit 2
Yellow/Black/Red/Green connect 4/5/1/2

Yellow/Black/Red/Green connect nothing

You may want to contact the T1 provider.  The way this normally works is that:

1 = Ring = Red
2 = Tip =  Green
4 = Ring1= Yellow
5 = Tip1 = Black
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Author Comment

Hmmm& a little more confused&.

This is a DS1C, 2 bonded T1s. The Router/CSU/DSU has 2 T1 jacks T1 has a jumper in place from Qwest. The second T1/T2 is where the supplied 4 wire RJ45 is inserted. But apparently this will be an 8 wire RJ45

I can grab a photo of the DMARC if that will hep?

Thanks for the help.
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LVL 57

Expert Comment

Let me see if I get this right.

Your router has two T1 DSU/CSU's.

Qwest gave you, or you ordered, a DS1c.

The DMARC is attempting to split the DS1c back into two independent T1's so that it will look like you have two T1's going into your router.

0

LVL 57

Expert Comment

Oh wait, you have two DS1c.  What DSU/CSU model do you have in the routers?
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Author Comment

Its a Dual T1/FT1 (1200872L1)& one DS1c ( comprised of 2 T1s)

Thanks!
0

LVL 57

Expert Comment

O.k. the more questions I asks the more confused I get.  A T1 only has 4 wires, there is no such think as a 8-wire T1.  Now I beleive a DS1c would have 8-wires, one for each T1.  But that would mean that all 8-wires would go into 1 RJ-45 connected and into 1 DSU/CSU.

Who is the local telco company?  You may have to ask them what the hand off is.

So you have a single DS1c that you need to split into two T1's?

Assuming that whatever the DMARC is is actually splitting the DS1c into two T1's (which I have no clue why they wouldn't have just provided two T1's) then then I believe that my post 22852559 should work.

This will make the router see two T1's, which if you want to "bond" together you will need to do via the router either  at the layer 2 or layer 3 level, depending on what you are using this for.

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Author Comment

Sorry for the confusion&

The local telco is Qwest. There are 2 T1s at the DMARC. The router was pre configured off site by Qwest then shipped to me.  Qwest installed a jumper (pass through?) on the T1 port on the CSU/DCU leaving the T2 jack open for the RJ45.

It sounds like I should remove the jumper on the T1 port (CSU/DSU) and bring each (4 wire) into the corresponding CSU/DSU port. It makes sense as these T1s will be bonded& I just wonder why the router had an intentional jumper on the T1 Jack CSU/DSU.

Thanks again for the help&
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Author Closing Comment

Thank you for the assistance.
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