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RSU INSTALLATION MANUAL 9

Chapter 3.

RSU Cable Preparation And Laying

3.1. INTRODUCTION

Following are the main cables required for RSU installation apart from the other

cables mentioned in C-DOT SBM RAX/DSS MAX-L/XL installation manual.

a. RSU Clock cable.

b. Digital Trunk Cables on RSU side.

c. Digital Trunk Cables on Central Module (CM) side.

d. BP Terminal cable on RSU side.

Co-axial cable is used to prepare the clock cable for RSU. Clock cable will be

connected between ETS (Enhanced Remote Time Switch) card slot position and TSC

(Time Switch Controller) card slot position on each copy of TSU. Since the

connections on the contact blocks at both ends are not one-to-one, care needs to be

taken by the installer while fixing it on the mother-board.

Digital Trunk Cable on RSU side is connected from Time Switch Unit to DDF. On

CM side, it is connected between Bus Termination Unit (BTU) and DDF. The shield

at DDF end of these cables are connected to chassis ground. Other end of the cable

shields (RBM and CM side) should be left open to isolate the ground.

Assembly of the digital trunk cable on RSU side also provides connection to an

ACIO cable. For ACIO part, jumper wire with PVC sleeve may be used.

BP terminal cable is optional only. This may be required for debugging switch units

in case RBM is totally cut off from the parent exchange and it is having critical

switch unit faults.

One CRP terminal is extended through modem on RSU side for maintenance

functions. This does not require any additional cables as Modem is normally

supplied alongwith a cable which is having D-type 25 pin connectors on both ends.

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Multitech BL-Series Bedienungsanleitung Seite 11