AT&T Telephone DS1/DMi/ISDN-PRI Instrukcja Użytkownika Strona 119
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SYNCHRONIZATION OF DIGITAL FACILITIES
5-29
CONCLUSIONS ON SYNCHRONIZATION
Make no assumptions regarding synchronization. Reverify items such as the availability of a
synchronization source, the clock stratum, and compatibility of every T1 span. The best guarantee is
written confirmation that the local exchange carrier, AT&T Communications, or other vendor will
either synchronize to a System 75, System 85, Generic 1, Generic 2, or provide an appropriate
synchronization reference.
Develop a diagram showing the network synchronization plan. Make multiple copies of this diagram
and keep a copy at each switch site. This diagram is essential for installing, administering, and
tuning up a DS1 network. Such a diagram can also be used by maintenance personnel to troubleshoot
network problems associated with synchronization.
USE OF GENERIC 2 AS A SYSTEM CLOCK REFERENCE
To provide increased reliability, it is recommended that (for all cases) the primary and secondary
system clock references be placed in different modules. Tips on how best to use DS1 as a clock
reference are provided next.
ISDN-PRI Trunk Facilities (ANN35 or TN767 with TN755)
ISDN-PRI trunks may terminate on a 4ESS toll office, 5ESS digital CO, System 85 R2V4, Generic
1, Generic 2, or compatible vendor’s switch. Depending on other considerations, any of these
terminating connections may be selected as a synchronization reference, either primary or secondary.
Line-Only Mode DS1/DMI-BOS (ANN11_ or TN767)
When using a line-only mode interface for synchronization purposes, the following facts should be
known:
●
●
Since the D4-channel bank (or equivalent) at the far end will be timed to the signal received from
a DS1, no slips should occur on a line-only mode DS1 facility. Because of this, slip counts from
line-only mode DS1s should not be used in the process of determining the health of a clock
reference (that is, they would tend to make the reference appear to be in better condition than it
may be).
Line-only mode DS1s should not be used as system clock references unless it is known for certain
that the incoming DS1 is locked to the AT&T reference frequency. Normally a DS1 facility
terminating directly on the far end D4-channel bank will not be locked to the AT&T reference
frequency.
- AT&T 1
- DEFINITY 1
- CONTENTS 11
- CONTENTS xv 15
- ABOUT THIS DOCUMENT 19
- 1. INTRODUCTION 25
- INTRODUCTION 26
- DS1 TRANSMISSION AND CABLING 74
- 4. THE DIGITAL LOSS PLAN 83
- THE DIGITAL LOSS PLAN 84
- PRIMARY FREQUENCY REFERENCE 110
- DIGITAL TRANSMISSION FACILITY 111
- (Generic 2) 191
- ● Numbers between (0 and 255) 213
- Selection basis 219
- CIRCUIT PACK 247
- SYSTEM-PARAMETERS CUSTOMER 251
- OPTIONS 251
- DS1 CIRCUIT PACK screen 256
- TRUNK GROUP screen; 257
- GROUP MEMBER 257
- ASSIGNMENTS 257
- SYSTEM PARAMETERS 258
- CUSTOMER-OPTIONS 258
- PROCESSOR CHANNEL ASSIGNMENTS 260
- INTERFACE LINKS 260
- DATA MODULE screen 263
- NETWORK-FACILITES 267
- CBC TRUNK GROUP USAGE 275
- ALLOCATION 275
- TRUNK GROUP 280
- DIAL PLAN RECORD screen 281
- TRUNK GROUP screen 283
- DIAL PLAN RECORD 284
- NETWORK-FACILITIES screen 285
- 8. MAINTENANCE AND ALARMS 289
- MAINTENANCE AND ALARMS 290
- ≥ ES ≥ 2460 in 41 minutes 298
- ADMINISTRATION REQUIREMENTS 304
- ABBREVIATIONS 355
- GLOSSARY 359
- GLOSSARY GL-13 371
- GLOSSARY GL-17 375
- GLOSSARY GL-19 377
- INDEX IN-13 393
Hotpoint HDA3600 podręczniki
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