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PC Paintbrush Image  |  1994-09-30  |  132.8 KB  |  316x312  |  8-bit (155 colors)
   ocr: switchblock speech circuit group switcholock signalling chonnel - data link data channel voice - trequency ichonnel mod dem dem Ivoice mod processor signol lling trequency signailing - processor L terminal - ichonneu terminal voice Trequency link dato channel signalling chonnel signalling link common chonnel signalling system note:- VF channel and modems may be reploced by digital arcurt Fig- 11.1 Basie schernarie common channel signalling