Installation guide

NetVanta 4305 Hardware Installation Guide Appendix A. Connector Pin Definitions

Dial Backup (DBU) Connectors

Table A-9 describes the pinouts for the following modules: 56/64K, T1/FT1 (1st generation), and T1/

FT1+DSX-1 (1st generation).

Table A-10 describes the pinouts for the following modules: Serial, E1/FE1, E1/FE1 with G.703 Drop, T1/

FT1 (2nd generation), Dual T1 NIM, and T1/FT1+DSX-1 (2nd generation).

Table A-9. DBU Connector Pinouts

Pin Name Description

1 R1 Network–Ring 1

2 T1 Network—Tip 1

3 — Unused

4T Network–Tip

5 R Network–Ring

6-8 — Unused

Table A-10. DBU Connector Pinouts

Pin Name Description

1-2 — Unused

3 R1 Network–Ring 1

4 R Network–Ring

5T Network—Tip

6 T1 Network—Tip 1

7-8 — Unused

An optional DIM is required for dial backup applications.