User Guide

ISDN Interfaces

RBSU/RBSS Interface Units

7-18 Strata CTX I&M 06/04

Step 3: Install the REBS

Note The REBS provides a basic part of the RBSU/RBSS circuit functionality; therefore, it must

always be installed on the RBSU (see Figure 7-13).

1. Align the two connectors carefully while observing the “UP” arrows on the REBS.

2. Plug the REBS onto the RBSU.

Step 4: Install the RBSS

Note If one or two additional BRI-NT circuits are required, install the RBSS (see Figure 7-13).

1. Align the four connectors carefully while observing the “UP” arrows on the REBS.

2. Plug the RBSS onto the RBSU.

Step 5: Install the R40S

Note If ISDN PS-1 backup power for TE devices is required, install the R40S (optional PCB) (see

Figure 7-13).

1. Align the two connectors carefully while observing the “UP” arrows on the R40S.

2. Plug the R40S onto the RBSU.

Figure 7-13 Location of RBSU Plug-on PCBs

R40S1A-CM V.1

RBSU

Optional RBSS1A

REBS

R40S

2761

(always install)

Optional PS-1 Power Supply

Two-circuit Subassembly