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Appendix A. Pinouts
A-4 TSU IQ+ User Manual 61200275L1-1
Table A-6. 4-Wire, V.34, and BRI ISDN DBU Card
Pin Assignments
Table A-7. Pin Assignments for the PRI DBU Card
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 1 B+D ISDN
1-3 - Not Used
4T Network-Tip
5 R Network-Ring
6-8 - Not Used
Pin Name Description
1 R1 RXDATA-RING Receive data from the net-
work
2 T1 RXDATA-TIP Receive data from the net-
work
3UNUSED--
4 R TXDATA-RING Send data toward network
5 T TXDATA-TIP Send data toward network
6,7,8 UNUSED --