CHAPTER 4. STATION WIRING
Installing the Z1A Emergency Transfer Unit
If a Z1A emergency transfer unit is used with CO trunks that require
ground start, a ground start switch must be installed on each telephone
to be used for emergency transfer. Ground is provided on the twenty-fifth
pair of leads on each purple row/connecting block associated with a
switch cable. Ground is connected to the third pair of a 3-pair terminal
appearance. This pair becomes the second pair at the information
outlet. A ground start switch is mounted on the side of the telephone
and wired to the ground and ring leads inside the terminal.
Figures 4-31 and 4-32 show the connections on 110-type terminal
blocks and 66-type connecting blocks, respectively, at the trunk/auxiliary
field for a telephone used only for emergency transfer. Figures 4-33 and
4-34 show the connections on 110-type terminal blocks and 66-type
connecting blocks, respectively, at the trunk/auxiliary field for a
telephone used for emergency transfer as well as a normal extension.
4-54
Summary of Contents for System 75
Page 1: ...AT T AT T System 75 and System 75 XE Wiring...
Page 2: ...AT T AT T System 75 and System 75 XE Wiring 555 200 111 Issue 2 August 1989...
Page 16: ...System Wiring Figure 1 2 System Uniform Wiring Plan 1 7...
Page 17: ...CHAPTER 1 INTRODUCTION Figure 1 3 Sample Uniform Wiring Installation 1 8...
Page 29: ...CHAPTER 2 HARDWARE 66 110 Type Figure 2 1 Block Diagram of System 75 or 75 XE Installation 2 2...
Page 35: ...CHAPTER 2 HARDWARE 66 110 Type Figure 2 4 110A Type 100 Pair Terminal Block 2 8...
Page 36: ...110 Type Hardware Description Figure 2 5 110A Type 300 Pair Terminal Block 2 9...
Page 98: ...Typical System Equipment Room Floor Plans 3 15...
Page 143: ...CHAPTER 3 EQUIPMENT ROOM DESIGN 3 60...
Page 144: ...Equipment Room Hardware And Cabling Installation 3 61...
Page 162: ...Equipment Room Hardware And Cabling Installation 3 79...
Page 163: ...Equipment Room Hardware And Cabling Installation 3 80...
Page 197: ...Tables Table 4 A Recommended Protectors 4 42 v...
Page 212: ...Adjunct Powering 4 15...
Page 214: ...Adjunct Powering 4 17...
Page 216: ...Patch Cord Jumper Installation And Administration 4 19...
Page 241: ...CHAPTER 4 STATION WIRING 4 44...
Page 244: ...Miscellaneous Wiring Installation 4 47...
Page 246: ...Miscellaneous Wiring Installation 4 49...
Page 252: ...Miscellaneous Wiring Installation 4 55...
Page 254: ...Miscellaneous Wiring Installation 4 57...
Page 314: ...CHAPTER 5 AUXILIARY EQUIPMENT INSTALLATION 5 41...
Page 324: ...CHAPTER 5 AUXILIARY EQUIPMENT INSTALLATION 5 51...