AT&T Telephone DS1/DMi/ISDN-PRI Manuel d'utilisateur télécharger pdf (Page 37)

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INTRODUCTION

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end, one framing bit is inserted in each succeeding 193rd bit-position of the DS1 signal. The receive

end uses the framing pattern to synchronize the end of one 24-channel block and the beginning of the

next, to identify the channels that contain embedded signaling information, and to detect errors.

NOTE: This 4K-bps facility data link is designed to maintain and supervise a DS1 facility.

However, this link is used by a System 75 and System 85 DS1s only for transmitting yellow

alarms.

Each 24-frame entity, spanning one ESF cycle, is called the ESF superframe. Figure 1-6, DS1 Signal,

Framing Format, and ESF Superframe (24 Frames), shows an ESF superframe.

NOTE:

For RBS, frames 6, 12, 18, and 24 carry signaling information.

Figure 1-6. DS1 Signal, Framing Format, and ESF Superframe (24 Frames)

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 395 396

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AT&T Telephone DS1/DMi/ISDN-PRI Manuel d'utilisateur Page 37

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