CHAPTER 4. STATION WIRING
Table 4-B. Recommended Protectors
PROTECTORS
Primary *
3B1A
(carbon)
79A Fuse
3B1E-W
(wide gap
gas tube)
3C1S
(solid state)
Primary
Secondary
(w/heat coil)
4B1C
Data Link Protector
(carbon)
(one or eight ckts)
4B1E-W
(wide gap
gas tube)
4C1S
(solid state)
Sneak Current
Protectors *
SCP-1
* A sneak current protector is always required when a 3-type
primary protector is used.
Requirement:
If protectors other than those listed in Table 4-B
are to be used in domestic installations, they must
be UL Iisted/approved. Also any protectors to be
used in Canadian installations must be CSA
certified.
The maximum range for protection of out-of-building digital voice terminals
using a primary and a secondary (data link) protector is 5000 feet when using
24 awg wire and 4000 feet when using 26 awg wire. The secondary (data
link) protector used with the 7400-type digital voice terminal is an isolation
transformer and requires that the voice terminal be locally powered by an
external power supply or through the ac power cord provided with some of
the 7400-type voice terminals.
Except for the secondary (data link) protector, all the recommended
protectors are plug-in 5-pin untis. There is a variety of 25-, 50-, and 100-pair
protector panels that are equipped with 66-, or 110-type connecting blocks
and/or RJ21X connectors. The secondary (data link) protector is equipped
with 110-type connecting blocks and must be used with a primary protector.
4-42
Содержание System 75
Страница 1: ...AT T AT T System 75 and System 75 XE Wiring...
Страница 2: ...AT T AT T System 75 and System 75 XE Wiring 555 200 111 Issue 2 August 1989...
Страница 16: ...System Wiring Figure 1 2 System Uniform Wiring Plan 1 7...
Страница 17: ...CHAPTER 1 INTRODUCTION Figure 1 3 Sample Uniform Wiring Installation 1 8...
Страница 29: ...CHAPTER 2 HARDWARE 66 110 Type Figure 2 1 Block Diagram of System 75 or 75 XE Installation 2 2...
Страница 35: ...CHAPTER 2 HARDWARE 66 110 Type Figure 2 4 110A Type 100 Pair Terminal Block 2 8...
Страница 36: ...110 Type Hardware Description Figure 2 5 110A Type 300 Pair Terminal Block 2 9...
Страница 98: ...Typical System Equipment Room Floor Plans 3 15...
Страница 143: ...CHAPTER 3 EQUIPMENT ROOM DESIGN 3 60...
Страница 144: ...Equipment Room Hardware And Cabling Installation 3 61...
Страница 162: ...Equipment Room Hardware And Cabling Installation 3 79...
Страница 163: ...Equipment Room Hardware And Cabling Installation 3 80...
Страница 197: ...Tables Table 4 A Recommended Protectors 4 42 v...
Страница 203: ...CHAPTER 4 STATION WIRING Figure 4 4 3 Pair to 4 Pair Wiring Labeling From Equipment Room to Information Outlet 4 6...
Страница 205: ...CHAPTER 4 STATION WIRING Figure 4 5 4 Pair Station Wiring Labeling From Equipment Room to Information Outlet 4 8...
Страница 212: ...Adjunct Powering 4 15...
Страница 214: ...Adjunct Powering 4 17...
Страница 216: ...Patch Cord Jumper Installation And Administration 4 19...
Страница 241: ...CHAPTER 4 STATION WIRING 4 44...
Страница 244: ...Miscellaneous Wiring Installation 4 47...
Страница 246: ...Miscellaneous Wiring Installation 4 49...
Страница 252: ...Miscellaneous Wiring Installation 4 55...
Страница 254: ...Miscellaneous Wiring Installation 4 57...
Страница 277: ...CHAPTER 5 AUXILIARY EQUIPMENT INSTALLATION Figure 5 1 Connections for Loudspeaker Paging and Music on Hold 5 4...
Страница 314: ...CHAPTER 5 AUXILIARY EQUIPMENT INSTALLATION 5 41...
Страница 324: ...CHAPTER 5 AUXILIARY EQUIPMENT INSTALLATION 5 51...