56/64 CSU/DSU Back to Back

[nivas]

I bought 2 56/64 k CSU/DSU WIC.
Can someone help me on setting it as DCE/DTE.
Can someone point me in the right direct on how do I do the back to back connection please.

[HermeszData]

I bought 2 56/64 k CSU/DSU WIC.
Can someone help me on setting it as DCE/DTE.
Can someone point me in the right direct on how do I do the back to back connection please.

These interfaces are similar to the WIC-1DSU-T1 interfaces and are used many times for Frame Relay connections. However the pin-outs are different.

To connect these back to back you use a crossover cable with RJ45 plugs on each end. the cable pin-out would be a follows:
1 ---> 7
2 ---> 8

Once you have the cabling correct, you would set one interface to provide clocking by issueing the clock source internal sub interface commmand (this would become your DCE interface). on the second interface you use the clock source line command (this would become your DTE interface)

Hope this helps.

[HermeszData]

Thanks for your reply on CSU/DSU cabling and clock rate. Isn't the crossover like below. What was the cable u mentioned. I thought below is the crossover
1-->3
2-->6
3-->1
6-->2

Can you please tell me what was the cable u mentioned

What you have listed above is a "Standard Ethernet" crossover. That will not work on your interfaces.

The 56k/64k CSU interfaces use pins 1,2 and 7,8

Check out the link below. in that thread is a link to the Cisoc site where cable types and pinouts are described!

http://www.lammle.com/discussion/showthread.php?t=1689 (http://www.lammle.com/discussion/showthread.php?t=1689)

[nivas]

That went just perfect.
I used the console cable ( rolled cable ) to connect both 56/64 k WAN interface card. Setting up routers as DCE and DTE can be obtained from CISCO document ID 10265

[HermeszData]

That went just perfect.
I used the console cable ( rolled cable ) to connect both 56/64 k WAN interface card. Setting up routers as DCE and DTE can be obtained from CISCO document ID 10265

That is not the best way because with a rolled cable (console cable) you have the pins as follows:

1 ---> 8
2 ---> 7
|
7 ---> 2
8 ---> 1

The correct pinout is:
1 to 7
2 to 8
7 to 1
8 to 2

Although many of those interfaces may work, some are sensitive to polarity.

Keep that in mind!

[king smith]

I am running win XP
I have changed the cmos battery. I have set to automatically synchronize with windows time sever and reset the system clock from cmd command. The clock will run as long as the PC is up and running but once it is shut down and rebooted the clock stays at the time it shut off.