AT&T Telephone DS1/DMi/ISDN-PRI Manual de usuario descargar pdf (Pagina 314)

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101

B-l0 SAMPLE INSTALLATION AND MAINTENANCE PROBLEMS

DS1

OR DMI

INTERFACE

DS1 OR DMI

INTERFACE

PRIMARY REFERENCE

LOCATION A

PRIMARY REFERENCE

LOCATION B

Figure B-10. Leavenworth Loop on the Primary Reference

DS1 OR DMI

INTERFACE

LOCATION A

SECONDARY REFERENCE

DS1 OR DMI

INTERFACE

LOCATION B

SECONDARY REFERENCE

PRIMARY REFERENCE

DS1 OR DMI

INTERFACE

LOCATION C

Figure B-11. Leavenworth Loop on the Secondary Reference

Make no assumptions when synchronizing digital networks; don’t take any aspect of synchronization

for granted and avoid Leavenworth loops. It is better to suffer the problems from high slip rates than

to risk losing all services provided by the switch.

It is necessary that the network synchronization diagram be maintained and be available at all switch

locations.

D4 Synchronization Problems

The D4-channel banks are used in a variety of applications. Primarily, these include interfacing an

analog switch or analog CO to a digital switch. The D4-channel bank is capable of internal stratum-4

timing, or loop timing via the office interface unit (OIU-1/OIU-2) circuit pack located in the

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AT&T Telephone DS1/DMi/ISDN-PRI Manual de usuario Pagina 314

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