Nortel Networks 1000M warranty Procedure Installing a Pftu

Page 148 of 456 Installing Power Failure Transfer Units

Installing a PFTU

Use the following procedure and any instructions provided with the Power Failure Transfer Unit (PFTU) to install and connect PFTUs.

Procedure 13

Installing a PFTU

1Install a PFTU according to the manufacturer’s instructions.

2Attach the yellow PFTU label to the designation strip, indicating the top connector as P1 and the bottom connector as P2.

3Install two NE-A25B type 25-pair cables from connectors P1 and P2 on the front of the PFTU to the PFTU termination area at the MDF.

4Cross-connect wiring for PFTU operation as shown in Table 6.

Table 6

MDF cross-connections for PFTU operations

Description	Connection
–48 V DC	PFTU connector P1, pin 49
+ return (GND)	PFTU connector P2, pin 49 and MDF GND
All grounds on system monitor cable	MDF GND
Console cable pin 11	PFTU connector P1, pin 25
Console cable pin 36	MDF GND
LFBEN (line forced bypass enable)	PFTU connector P1, pin 50
LFBENR (line forced bypass enable return)	MDF GND
MDF GND	PFTU connector P2, pin 24

Note: At connector P1 on the PFTU, pins 25 and 50 are labeled SWE for “switch enable.” When pin 25 is grounded by the attendant console or pin 50 is grounded by the system monitor, line transfer is activated.

5For AC-powered systems, install the A0367916 auxiliary power supply.

a.Attach the unit to the wall using screws in the four mounting holes.

b.Connect a #24 (or larger) AWG wire from the –48 V connection on the auxiliary power supply to the PFTU termination area on the MDF.

NN43021-310 Standard 02.01 December 2007