Nortel Networks DCT1900 manual Red Normally off. Watch-dog LED not significant

Models: DCT1900

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Technical Product Manual - DCT1900

Installation Instructions, Digital Trunk Unit (DTU-T1, CCS) - REX-BRD0025 or 2/ROFNB 157 13/3

CHAPTER 13

Digital Trunk Unit (DTU-T1, CCS) - REX-BRD0025 or 2/ROFNB 157 13/3

13.1General

The DTU–T1 provides 46 (23B+D) communication channels via two 1.544Mbit/s links (primary rate interfaces).

Maintenance

The DTU–T1 has the following field–exchangeable parts (see Figure 13-1 for placement & orientation):

zDTU–T1 CCS Firmware RYS 105 650

zThe DTU–T1 CCS Firmware is pre-installed on the board.

13.2Board Description

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

Cables

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

Jumpers

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

Note:

The jumper settings should be 3 O, 2 O and 1 C if the DTC is externally looped back via the twisted pair connector.

Connectors

The DTU–T1 board has 4 connectors at the front, two for each DTC. Only the twisted pair connector is used. See Figure 13-1.

LEDs

 

 

Each DTC has its own LEDs:

 

LED1

Green

: Normally on. Power On LED

LED2

Red

: Normally off. Watch–dog LED (not significant)

LED3

Red

: Normally off. Board not polled LED

LED4

Red

: Normally off. Board Error LED

13.3Installation

1.Place the DTU–T1 Firmware PROMs and check the strap setting (see Figure 13-1).

2.Insert the DTU–T1 into 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

13-1

© 2000-2005

 

Page 213
Image 213
Nortel Networks DCT1900 manual Red Normally off. Watch-dog LED not significant