Specifications

92
CSU/DSU MS DBU
Appendix A. Pinouts
The following tables give the pin assignments for the connectors on the back
of the CSU/DSU MS DBU, the DBU cards, and the SNMP Ethernet Module.
For more information on the connectors, see Chapter 2.
Table A-1. Pin Assignments for Telco Connector
Pin Name Description
1 R1 Transmit Data from DSU to Network—Ring 1
2 T1 Transmit Data from DSU to Network—Tip 1
3-6 — Not Used
7 T Receive Data from Network to DSU—Tip
8 R Receive Data from Network to DSU—Ring
Table A-2. Pin Assignments for DBU Card Connectors
Pin Name Description
4-wire Switched 56
1 R1 Transmit Data from DSU to Network—Ring 1
2 T1 Transmit Data from DSU to Network—Tip 1
3-6 — Not Used
7 T Receive Data from Network to DSU—Tip
8 R Receive Data from Network to DSU—Ring
V.34 and 1B+D ISDN
1-3 — Not Used
4 T Network—Tip
5 R Network—Ring
6-8 — Not Used