Instruction manual

ATLAS 800 Series System Manual Option Module Pinouts

Engineering Guidelines

NxT1 HSSI/V.35 Option Module

The NxT1 HSSI/V/35 Option Module (P/N 1200771L1) uses a single 50 pin SCSI-II interface (or V.35

interface using an optional adapter cable) to combine eight T1s of data (a combination of eight using the

four NxT1 HSSI/V.35 Module T1 ports and other T1 ports installed in the system). See Pinouts 30 and 31.

Pinout 30. NxT1 HSSI/V.35 Module (RJ-48C)

Pin Name Description

1 RxData - Ring (R) Receive data from the network

2 RxData - Tip (T) Receive data from the network

3Unused —

4 TxData - Ring (R1) Send data towards the network

5 TxData-Tip (T1) Send data towards the network

6,7,8 Unused —

Pinout 31. NxT1 HSSI/V.35 Module (50-pin SCSI-II and V.35 Winchester)

(+ Side)

(- Side)

Direction Description

1 26 — HSSI SG - Signal Ground

2 27 O HSSI RT - Receive Timing

3 28 O HSSI CA - DCE Available

4 29 O HSSI RD - Receive Data

5 30 O HSSI LC - Loopback Circuit C

6 31 O HSSI ST - Send Timing

7 32 — HSSI SG - Signal Ground

8 33 I HSSI TA - DTE Available

9 34 I HSSI TT - Terminal Timing

10 35 I HSSI LA - Loopback Circuit A

11 36 I HSSI SD - Send Data

12 37 I HSSI LB - Loopback Circuit B

13 38 — HSSI SG - Signal Ground

— 39 — Ancillary to DCE (Reserved)

14 — I V.35 RTS - Request to Send

15 40 I V.35 TT Terminal Timing