Chapter 14.pdf, Chapter 14, 1 general – Nortel Networks DCT1900 User Manual

Page 217: 2 board description, 3 installation

Technical Product Manual - DCT1900

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

Install-DCT1900/R8/mw

14-1

HAPTER

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

LTU2 - REX-BRD0019A or ROFNB 157 25/2

14.1

General

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

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

LTU Firmware - REX-SW0012 or RYS 105 661

LTU2 Firmware - REX-LTU2FW 01/1H

Note: LTU2 can only be used with CPU2 board.

14.2

Board 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.

LTC1 – LTC4: connection of PBX line 1 to 4

LTU Ground: connection of signalling earth (ELR)

LTC5 – LTC8: connection of PBX line 5 to 8

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

14.3

Installation

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

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

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