| darthfeces 2002-12-06, 12:06 pm |
| SETTING UP BACK TO BACK CSU/DSU
This is for those working with the modular routers with the WIC-DSU-T1 cards installed.
The original document is now available at the Cisco web site. It was originally available only to internal Cisco SE’s
http://www.cisco.com/warp/public/471/75.html#command
You can connect 2 WIC1-T1-DSU Back to Back by using a Cross-Over cable between the CSU/DSUs.
Back-to-back configuration of the 4-wire CSU/DSU has the following restrictions:
You cannot use a clock rate of auto on either side of the back-to-back setup.
You cannot use a clock rate of 64.
You cannot use switched-56 operation.
Constructing a Cross-Over Cable
A 4 wire T-1 cross-over cable uses (1->4, 2->5, 4->1, 5->2)
A 4 wire 56k cross-over cable uses (1->7, 2->8, 7->1, 8->1)
T1 CSU/DSU Configuration
Set one CSU/DSU to clock source internal, and the other CSU/DSU to clock source line. The linecode, framing, data-coding, and timeslots must be set the same on both CSU/DSUs.
Four-Wire 56k CSU/DSU Configuration
Set one CSU/DSU to clock source internal, and the other CSU/DSU to clock source line. On the CSU/DSU with internal clock, the clock rate must not be auto. Both CSU/DSUs must be set for service-module 56k network-type dds. |
