Nortel Networks DCT1900 manual General, Jumpers

Technical Product Manual - DCT1900

Installation Instructions, Digital Trunk Unit (DTU-T1, CAS) - REX-BRD0021 or 2/ROFNB 157 13/2

CHAPTER 12

Digital Trunk Unit (DTU-T1, CAS) - REX-BRD0021 or 2/ROFNB 157 13/2

12.1General

The DTU–T1 provides 48 communication channels with the PBX via two 1.544Mbit/s links.

Maintenance

The DTU–T1 has the following field–exchangeable parts (see Figure 12-1 for placement & orientation):

z DTU–T1 CAS Firmware RYS 105 660 (Factory Installed)

12.2Board Description

The DTU–T1 Board contains two identical Digital Trunk Circuits (DTC1 and DTC2), each with their own identical connectors and LEDs.

Jumpers

The line length selection can be adjusted with the three jumpers, 1, 2, and 3 (see Table 13-1).

Cables

The DTU-T1 interfaces via 100 ohm twisted pair cable only (AWS1034)

Connectors

The DTU–T1 board has two connectors on the front, one for each DTC. The connectors are for twisted pair connections to the PBX.

LEDs
Each DTC has its own LEDs:
LED1	Green	: Normally on. Power On LED
LED2	Red	: Normally off. Watch–dog LED
LED3	Red	: Normally off. Board not polled LED
LED4	Red	: Normally off. Board Error LED

12.3Installation

1.Place the DTU–T1 Firmware PROMs and set the jumpers (see Figure 12-1 and Table 12-1).

2.Insert the DTU–T1 on to the card guide in the specified board position.

3.Gently push the board into the backplane connector until it locks. Don’t use any force.

4.Connect the cable, AWS1034, to the front of the board.

Install-DCT1900/R8/mw	12-1
© 2000-2005