5
TABLE OF CONTENTS
Contents
Chapter
Page
1.
Specifications .............................................................................................. 7
1.1 G.703 Interface ...................................................................................... 7
1.2 Data-Communications Interface .......................................................... 7
1.3 Data-Communications Control Signals ............................................... 8
1.4 Other Physical Specifications ............................................................... 9
2.
Introduction .............................................................................................. 11
2.1 Functional Description ....................................................................... 11
2.2 Timing Theory .................................................................................... 13
2.2.1 CCITT G.703 Signalling ............................................................ 13
2.2.2 G.703 Codirectional Timing ..................................................... 13
2.2.3 Tail-End Clocking ...................................................................... 17
2.2.4 G.703 Codirectional Rules ......................................................... 17
2.3 Rate-Conversion Rules ........................................................................ 19
2.4 Physical Description ............................................................................ 19
3.
Installation .................................................................................................. 20
3.1 Unpacking ........................................................................................... 20
3.2 Site Requirements ............................................................................... 20
3.3 Setting Jumpers ................................................................................... 21
3.3.1 Overview ..................................................................................... 21
3.3.2 The Jumper-Setting Procedure ................................................. 23
3.4 Installation in 19-Inch Racks .............................................................. 23
3.4.1 Overview ..................................................................................... 23
3.4.2 Installing a Single Unit in a 19-Inch Rack ................................ 24
3.4.3 Installing Two Units in a 19-Inch Rack ..................................... 25
3.5 Connecting Power and Data Cables .................................................. 27
3.5.1 Power Connection ..................................................................... 28
3.5.2 G.703 LINE Connection ............................................................ 29
3.5.3 DTE Connection ........................................................................ 30
3.5.4 Async Secondary-Channel Connection .................................... 30