Nortel Networks DCT1900 manual LTU supports 8 two wire analog connections to a PBX

Technical Product Manual - DCT1900

Installation Instructions, Line Termination Unit (LTU) – REX-BRD0007 or ROFNB 157 02/6 and LTU2 - REX-BRD0019A or ROFNB

CHAPTER 14

Line Termination Unit (LTU) – REX-BRD0007 or ROFNB 157 02/6 and LTU2 - REX-BRD0019A or ROFNB 157 25/2

14.1General

The LTU supports 8 two wire analog connections to a PBX.

Maintenance

The LTU contains the following field–exchangeable part (see Figure 14-1):

zLTU Firmware - REX-SW0012 or RYS 105 661

zLTU2 Firmware - REX-LTU2FW 01/1H

Note: LTU2 can only be used with CPU2 board.

14.2Board Description

Jumpers

Not applicable.

Connectors

The LTU has 4 connectors at the front by which Line Termination Circuits (LTCs) are connected to the PBX/Centrex.

1.LTC1 – LTC4: connection of PBX line 1 to 4

2.LTU Ground: connection of signalling earth (ELR)

3.LTC5 – LTC8: connection of PBX line 5 to 8

4.Pin a is tip, pin b is ring. Pins a’ and b’ are not used.

LEDs
LED1	: Normally on. Power On
LED2	: Normally off. Watch–dog
LED3	: Normally off. Board not polled
LED4	: Normally off. Board Error

14.3Installation

1.Insert the LTU gently into the card guide in its specified board position (See Figure 14-1).

2.Gently push the board into the back connector until it locks. Do not use any force.

3.Connect the connectors from cable set NTM/TSRNB 101 31 to the front of the board.

Install-DCT1900/R8/mw	14-1
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