Toshiba Strara CTX Series Installation And Maintenance Manual page 161

Install the RBSS
Step 3:
If one or two additional BRI-NT circuits are required, install the RBSS (see
Note
1. Align the four connectors carefully while observing the "UP" arrows on the REBS.
2. Plug the RBSS onto the RBSU.
Install the R40S
Step 4:
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.
Optional RBSS1A
Two-circuit Subassembly
Figure 5-11 Location of RBSU Plug-on PCBs
Strata CTX I&M September 2002
UP
UP
2761
UP
R40S1A-CM V.1
RBSU
UP
Optional PS-1 Power Supply
R40S
ISDN Interfaces
Figure 5-11).
REBS
(pre installed on RBSU1 -
not used on RBSU2)
UP
UP
5-13