Nortel Networks DCT1900 manual Modular Cabinet LTU Cabling, Introduction

Technical Product Manual - DCT1900

Installation Instructions, Modular Cabinet – LTU Cabling

CHAPTER 23

Modular Cabinet – LTU Cabling

23.1Introduction

This chapter describes the installation of the cabling between the LTU(s) and the PBX. The LTU cable set, NTM/TSRNB 101 31, consists of two 12 pair cables terminated in one 25 pair amphenol connector. The other end of each cable ends in three Ericsson half connectors. Refer to Chapter 26, Modular Cabinet cables, for a cable schematic and physical description.

Each LTU cable is designed to connect three LTU boards, thus 24 analog extensions, to a single 66 Block. The cable terminates in a 25 pair male amphenol connector which mates with a Siemens 66m250 Block or the connector can be cut off and the cables punched down on other types of blocks. Refer to Table 23-1 for a pin out of the cable

The Modular Cabinet is provided with a ground strip to connect the cables from the LTUs and the CLUs to ground. These ground connections are necessary for EMI suppression reasons.

Note:

The orientation of the shielding clamps shall be according to Figure 23-1. If the clamp is positioned at the wrong side, remove the clamp and position it properly.

Shielding clamp at the back row

Shielding clamps at the front row

Fig. 23–1 Ground Strip with Shielding Clamps

Install-DCT1900/R8/mw	23-1
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