Nortel Networks DCT1900 - Manual (Page 254)

Technical Product Manual - DCT1900
Installation Instructions, Modular Cabinet – Power Cabling
19-4 Install-DCT1900/R8/mw
© 2000-2005
19.3 Installation
Modular Cabinet Powered by an External 300 Watt –48Vdc Power Supply
When the Modular Cabinet is powered by an external -48V power supply, Base Station power can
be supplied to the CLUs/SLUs in the following ways:
z to maximum 3 CLUs/SLUs via the backplane PW-BP connection on the MCCB
z to maximum 4 CLUs/SLUs via the PW–EXT connection on the MCCB
The advantage of powering via the backplane is that the Base Station is switched off when the
Modular Cabinet is switched off by the switch on the cabinet.
When combining both methods, a maximum of 7 CLUs/SLUs can be provided with Base Station
power.
Modular cabinet powered by a -48Vdc PBX power supply
When the modular cabinet is powered by a -48Vdc PBX power supply, Base Station power can
be supplied into the CLUs/SLUs in the following ways:
-
to a maximum of 3 CLUs/SLUs via the PW-BP connection on the MCCB
- to a maximum of 7 CLUs/SLUs via the PW-EXT connection on the MCCB
When combining both methods, a maximum of 9 CLUs/SLUs can be provided with Base
Station power.
Base Station Power Supplied to a Maximum of 3 CLUs via the Backplane
Fig.19–5 gives a schematic diagram of this configuration. Fig. 19-6 gives the cable diagram of this
configuration.
Fig. 19-5 Schematic Diagram of Powering the Modular Cabinet
and 3 CLUs/SLUs by an External Source
1. Connect a power cable from terminal block A to the DC power source.
Note:
The positive pole of the external DC source is connected to the ground of the Modular Cabinet via
the backplane and a jumper from the (+) side of the input filter.
Backplane
Modular Cabinet
Internal
External
Source
-48V
PW-BP
MCCB
CLU/
SLU
A
B
WARNING
When using the PBX power supply, make sure that the capacity of the
supply is sufficient to power both the PBX and the Modular Cabinet.