#T1 LOOPBACK CABLE SERIAL#
Using a RJ45 and looking from the connector side up, with the cable end point towards yourself, count from left to right.Ī useful troubleshooting aid is to make a single loopback connector, pins 1 -5 and 2-4 This will let you test the serial interface to the T1 interface termination. What pins do I need to connect for a T1 loopback cable? If you are using a T1-WIC card, don't forget the following command: What are the Cisco cables for DTE to DCE back to back?ĬAB-V35MT and CAB-V35FC (Cisco 2500 or other high density serial connectors) A third way is to make a T1 back-to-back cable and then connect the two routers through the DSU/CSUs. A second way is to get a serial to V.35 DTE and DCE cable set and connects the two V.35 connectors together. One way is purchase the special cable that allows you to connect the routers together. With two routers you can have them back-to-back with or without a T1 link. Basically you are connecting Pin 1 to 4 and Pin 2 to 5.Yes you can. Below are is the pin out for a loopback plug using Orange and Orange White. If you put in a T1 loopback plug in a smartjack and the carrier does not see the loop, the problem is on their side of the network.
#T1 LOOPBACK CABLE CODE#
So the color code would be Orange White – Orange – Space – Blue – Blue White on one end and Blue – Blue White – Space – Orange White – Orange on the other end of the cable.Ī T1 loopback plug can quickly clear your side of the network. I typically just do the green – green white – brown white – brown routine.įor a T1 cross-over, we need to swap 1 and 2 with 4 and 5. for the spaces you can just insert any cable as those pins are not used. So below are the pin-outs for a T1/E1 cable and cross, as well as a loopback plug.įor a straight T1 cable, its Orange White – Orange – Space – Blue – Blue White – Space – Space – Space. Now T1 cables are something that we do come across quite often in our day to day jobs, and occasionally we need a cable or need to extend a cable. If you need to make a console cable that would be a roll cable – Orange White – Orange – Green White – Green – Blue White – Blue – Brown White – Brown on one end and Brown – Brown White – Blue- Blue White – Green – Green White – Orange – Orange White on the other end (Pins 1-8 and then 8-1) So one side will be 568A – Green White / Green / Orange White / Blue / Blue White / Orange / Brown White / Brown and the other will be 568B Orange White / Orange / Green White / Blue / Blue White / Green / Brown White / Brown. This swaps the transmit and receive pair in order to make the cross over cable. Now, for a cross-over you make one end of the cable 568A and the other end 568B. So it is Orange White / Orange / Green White / Blue / Blue White / Green / Brown White / Brown. To make a TIA/EIA-568B cable, the color coding similar, just that the green and orange pairs are reversed. To make a TIA/EIA-568A cable, the color coding is Green White / Green / Orange White / Blue / Blue White / Orange / Brown White / Brown. The reason I want to mention both is because they come into play in a cross-over cable. The more commonly found one is 568B, but on occasion you will find 568A cabling in some older sites. When it comes to Ethernet cabling there are two common types – 568A and 568B – of wiring. Here is a quick image of a RJ45 head with the pins numbered.
#T1 LOOPBACK CABLE HOW TO#
I figured I would post up some info on how to make Ethernet cables, Cross-over Ethernet cables, T1/E1 cables, and cross-over T1/E1 cables. Networking Wiring – oh the joys of needing a cable and not having one with you or the length that you need.
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