Nortel DMS-100 Series Maintenance Manual page 35

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Table of Contents

Table 1 Circuit breaker assignment for FSP in OPM

The FSP NT6X25BC in the NT8X01AB, AC, BB and BC contains the

OPM grounding network

The cabinet ground bar in the end-access compartment connects to the OPM

principal GND. The user provides the GND according to local utility codes

and operating company requirements. Maximum recommended

ground-to-earth resistance is 25 Ω.

Refer to the following figures:

nine dc circuit breakers to control power distribution to each electronic unit

and two additional circuit breakers. These circuit breakers are CB10 and

CB11. The CB10 and CB11 can connect to optional equipment like the

fiber units and channel banks. Refer to the previous table for breaker

assignments.

eight QFF-type fuses to fuse dc links to alarms, fans and SD circuit packs

OPM Main Ground Bar Terminations NT8X01AA OPM-640/NT8X01BA

OPM Grounding Network NT8X01AB OPM-640/NT8X01BB OPM-256

OPM Grounding Network NT8X01AC OPM-640/NT8X01BC OPM-256

DMS-100 Family OPM Maintenance Manual ISN07 (TDM)/SN07 (DMS) and up

OPM maintenance summary 1-19

Optional equipment shelf (only in the NT8X01AB,

AC, BB and BC)

Optional equipment shelf (only in the NT8X01AB,

AC, BB and BC)

Troubleshooting