Nortel Networks DCT1900 manual Installation, Modular cabinet powered by a -48Vdc PBX power supply

Technical Product Manual - DCT1900

Installation Instructions, Modular Cabinet – Power Cabling

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:

zto maximum 3 CLUs/SLUs via the backplane PW-BP connection on the MCCB

zto 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.

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.

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.

B		PW-BP
A			CLU/
	Backplane	MCCB
			SLU
External
Source	Internal
-48V		Modular Cabinet

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.

19-4	Install-DCT1900/R8/mw
	© 2000-2005