06-22-2006 07:35 AM - edited 03-03-2019 03:46 AM
I have two routers cisco 1720 with 56/64 DSU/CSU WIC and t1 dsu/csu wic and a cisco 1602 with t1 dsu/csu wic . I wanted to connect them back to back for testing purposes. Itried using a crossover cable and I couldn't get a link for both of them is there something that I'm missing or doing wrong in here? I tried to search for this and the only thing that keeps on popping up was to use a Serial Cable which both routers don't have serial inputs. Thank you in advance for advices and answers.
06-22-2006 08:00 AM
you try out one the router with clockrate command, i mean one route configure as DCE and other is DTE
2) Check keepalive timing
3) check encapulation
4) otherwise also tried tested cross cable
06-22-2006 08:35 AM
make sure you are having correct cross cable for T1...for T1 its configuration is
1 <--->4
2 <--->5
4 <--->1
5 <--->2
check it out for this...
hope this will help you
rate this post if it helps
regards
Devang
06-22-2006 08:58 AM
First make sure you have a correct cross cable. I assume you are attempting to connect a wic-1dsu-56k4 and a wic-1dsu-t1.
These use different pinout. A t1 uses 1,2,4,5 a 56/64 uses 1,2,7,8. I have not made a cable like this but I suspect you should be able to use 1-7,2-8,4-1,5-2 where the first number in the pair is the t1 end of the cable.
Now you must reconfigure also the t1 card to run as a fractional using only the first channel.
06-22-2006 11:23 AM
To beat a dead horse:
A T-1 uses cable pairs 1-2 and 4-5. So, your cable would cross these two pairs.
Pin 1 on one side goes to Pin 4 on the other end. Pin 2 goes to 5, 4 goes to 1,
and 5 goes to 2. All you need to do is have one side provide clocking on the line,
just as a serial interface would.
1 orange/white
2 orange
3 white/green
4 blue
5 white/blue
6 green
7 white/br or bl
8 br or bl
1 blue
2 white/blue
3 white/green
4 orange/white
5 orange
6 green
7 white/br or bl
8 br or bl
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