Nortel Networks DCT1900 manual Digital Trunk Unit DTU-E1 REX-BRD0002 or 2/ROFNB 157 13/1

Technical Product Manual - DCT1900

Installation Instructions, Digital Trunk Unit (DTU–E1) – REX-BRD0002 or 2/ROFNB 157 13/1

CHAPTER 11

Digital Trunk Unit (DTU–E1) – REX-BRD0002 or 2/ROFNB 157 13/1

11.1General

The DTU–E1 provides 60 communication channels via two 2 Mbit/s links.

Maintenance

The DTU–E1 has the following field–exchangeable parts (see Figure 11–2 for placement & orientation):

zDTU–E1 CCS Firmware Set NTM/RYSNB 101 17/3

zDTU–E1 CAS Firmware Set RYS 105 664

zThe DTU–E1 Firmware Set is delivered as a separate item

11.2Board Description

The DTU–E1 Board contains two identical DTCs (DTC1 and DTC2), each with their own identical connectors and LEDs.

Straps

By means of straps, the type of cable to be used can be selected: coaxial pairs or 120 ohm twisted pairs (symmetrical). In Figure 11–1 an overview of the strap settings is given, for the location refer to Figure 11–2.

Note:

The straps should be placed in the twisted pair position (120 Ω).

Coax/twisted pair straps DTC1 and DTC 2

Coax (connection closed)

Twisted pair (connection open)

Not allowed

Not allowed

Fig. 11–1 Strap Settings DTC1/DTC2

Connectors

The DTU–E1 board has 4 connectors at the front, two for each DTC. One is for coax cable and the other one is for twisted pair cable connection. See Figure 11-2.

Install-DCT1900/R8/mw	11-1
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