You'll need to purchase an external CSU/DSU to connect to the 2500. Usually
uses a V.35 cable between router and CSU/DSU. Then connect the internal
CSU/DSU of the 2600 to the external CSU/DSU. T-1s use pins 1&2 and 4&5.
Create a rollover cable swapping those two pairs and you're good to go.
Rememb
Given that you are sending channelized data from the 2600, you will need an
external CSU for the 2500 to return the channelized data from the 2600 back
to serialized data. The cabling between the two CSU's is a simple crossover
cable where the pinout is:
1 -- 4
2 -- 5
4 -- 1
5 -- 2
Then
You will need a CSU/DSU, for one of the 2500 routers... then a loopback line
cable (easy to make). then you could do what you are wanting... But to
behonest with you, when you hook up 2 serials together, you are simulating a
wan connection, default is T1 unless you change the bandwidth command...
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