Nortel Networks DCT1900 - Manual (Page 293)

Technical Product Manual - DCT1900
Installation Instructions, Modular Cabinet – LTU Cabling
Install-DCT1900/R8/mw 23-1
© 2000-2005
C HAPTER 23
Modular Cabinet – LTU Cabling
23.1 Introduction
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.
Fig. 23–1 Ground Strip with Shielding Clamps
Shielding clamps at the front row
Shielding clamp at the back row