ISDN Interfaces
RBSU/RBSS Interface Units
Strata CTX I&M 10/02 5-15
ISDN Interfaces
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 5-11).
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 5-11).
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 5-11).
1. Align the two connectors carefully while observing the “UP” arrows on the R40S.
2. Plug the R40S onto the RBSU.
Figure 5-11 Location of RBSU Plug-on PCBs
UP
UP
UP
UP
UP
UP
R40S1A-CM V.1
RBSU
Optional RBSS1A
REBS
R40S
2761
(always install)
Optional PS-1 Power Supply
Two-circuit Subassembly
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