I had an interesting experience recently as I was sent to extend from the Verizon DMARC to a CISCO router located in a shopping mall a 56 kbps line. Only thing was, I did not know that the pinout configuaration at the DSU/CSU was different from a T1 Pinout (1, 2, 4 and 5) of which I have installed many in my lifetime. So, just in case some one else runs into this, the pinout for a 56/64 kilobit circuit is 1, 2, 7 and 8. Here is also a handy link for reference: https://www.ciscosystems.com/en/US/...4/software/user/guide/boapin.html#wp4769 . I am sure that if it has happened to me, it might just happen to someone else. Just want to pass on a tip to others that might run into this situation in the future.............especially if you are in the Rent - a - Tech business
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Hey man I was wondering for what reason would I need to put in a crossover cable at a T1 Dmark extension? I have been working on one for a few days and bout pulled my hair out (although I aint got much) but what would be the reason for it not to work even after I punched down all four pair? Can you help me?
I have seen it with some of the ClEC's IAD where you need a T1 crossover cable instead of the standard T1 cable. I think it is the way the port was configured from the carrier. You know for a T1 cable you use pins 1,2 and 4,5 for a straight cable and reverse one end to make a crossover cable.
Zapato, I know this post is from a long time ago, but I have a question if you are still around. Is that 1,2,7,& 8 straight through, or 1,2 to 7,8(and visa versa)? Since it only shows one side I was thinking it was straight through. If it is straight through, wouldn't a standard patch cord work, and the other pairs are just ignored?
The reason for the question is I did in install yesterday, and used a standard patch and it did not work. That is when they told me, use 1,2,7 & 8. I asked were they crossed(1,2 to 7,8) and the engineer acted like he had no idea what I was talking about. Obviously since a cable has two ends. I wanted detail, but I didn't get any.
I ended up using the standard patch cable, cutting off one end. So we have
Conn - 1 1- W/O 2- O/W 7- W/Br 8- Br/W
Conn - 2 1- W/Br 2- Br/W 7- W/O 8- O/W
All the other pins have their normal 568b colors, but since they are not used I am assuming they are ignored.
After I redid the cable and installed as requested, the circuit went from down/down to up/down. I do not know if it is a provider issue or a problem with my cable.
56K circuit is 1,2 - 7,8 straight through. If you setup requires a cross-over then somethings wrong. If with your cross-over it half works, I would try and reterminate the cable.
Hello. I hope this is the right forum. I don't gave much experience with csu/dsu wiring, so please forgive me.
We had a telco provider extend a 56k circuit from the demarc to our computer room. I always thought that there should be two pairs. However, I only have one pair. Is there something I am missing?
This circuit will be going directly into my cisco router (wic).
My wiring was straight through for my question. A standard patch cord would(and did)work fine. The customer insisted I hand make a cable using only 1,2 and 7,8, because they were sure the extra pairs were causing the circuit to fail. I knew that was hoey, but I couldn't prove it to them. At least not until two weeks later when AT&T finally got the circuit provisioned properly...
