Nortel Networks DCT1900 - Manual (Page 380)

Technical Product Manual - DCT1900
Maintenance, Part Replacement
5-4 Maint-DCT1900/R8/mw
© 2000-2005
- Execute Add command for the New Base Stations in the Base Stations window.
z SLU boards:
-
Execute Replace command for the CLU. Remove and re-insert into new position.
- Refresh Radio Exchange and Base Station windows.
- Execute Remove command for the old CLU position.
- Execute Add command for the New Base Stations in the Base Stations window.
5.7 Adding Boards
New boards placed into the system are automatically detected by the CPU within 1 minute.
5.8 Fuses
In a Modular Cabinet system, the following replaceable fuses are found:
Modular Cabinet – Fuses near power switch
Left fuse, in + rail, red wire:
z Protection against overload AC.
z Protection against overload DC supply (non–earthed).
z Protection against reversed DC supply (non–earthed) connection.
z Protection against reversed PBX (–48V) connection.
z Protection against DC supply with grounded – rail.
Right fuse, In – rail, black wire.
z Protection against overload PBX supply with grounded + rail (–48V).
z Protection against overload AC.
z Protection against overload DC supplies (non–earthed).
z Protection against reversed DC supply (non–earthed) connection.
Replacement:
1.
Switch off Modular Cabinet.
2. Replace fuse.
3. Switch on Modular Cabinet.
Modular Cabinet – Fuse near power switch to Backplane
z Protects backplane.
Modular Cabinet – Fuses on the MCCB in Modular Cabinet
The fuses on the MCCB are only used for the "external power" connection.
Front fuse:
z Protection against overload in Base Station powering via PW3/4/5/6.
Rear fuse:
z Protection against overload in Base Station powering via PW1/2/7.
Replacement:
1.
Remove the power cable connected to PW–EXT.
2. Replace the fuse.
3. Re–connect the power cable.