64 lines
2.4 KiB
Plaintext
64 lines
2.4 KiB
Plaintext
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The Autodial
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Proudly Presents
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'What happens when you call..'
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Preface:
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--------
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This file was written by information for the greater 408 & 415 area codes.
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Information contained in this file may not be accurate for all areas.
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The Local office:
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-----------------
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Assuming you want to call cousin Harry in New York, you would pick up the
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phone and dial. There is much more to it than that. When you pick up the
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phone, the voltage drops and the ESS send you dial tone. Now upon hearing the
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tone you proceed to dial '212-732-9087' the ESS recognizes the '212' as an out
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of area call, so it employs the ccis to place your call.
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The CCIS:
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---------
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Now your end office checks the traffic on the long distance trunks and selects
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the least busy. Your ESS then signals the ESS in New York to call 212-732-9087.
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It does this by CCIS.. The following tones are sent from your ESS to New York's
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ESS 'KP-212-732-9087-ST'
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The End of the Connection:
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--------------------------
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After the above tones are recieved by New York A long Distance line is
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released to your end office by the CCIS Net COntrol. You hear a faint click or
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two in the entire three - five seconds it takes to place the call. You hear a
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ringing signal and the CCIS signals your end office to begin billing. Yes the
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ESS is designed to bill the calling party during the ringing.
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Line Home?:
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-------------
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Now supposing Uncle Harry is talking to someone. When the call hits his ESS,
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it (ESS) looks for a make busy flag. If it encounters one it then checks to see
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if Uncle has a make busy override flag (call waiting) if he does you hear a
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ring, if not you get a busy signal.
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A few words on Blue Boxes:
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--------------------------
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With the superfast trunk orders made by the CCIS & ESS blue boxing has become
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obsolete. Unless of course you happen to live in an area that is not owned by
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Bell or AT&T then you can box in and out of the lines faster than they
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(GTE,etc.) can. This is due to the fact that the other guys have to lease
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Bell's older, antiquated trunks which never were designed to handle ESS or CCIS.
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Foot Notes:
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-----------
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ESS = Electronic Switching System
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CCIS= Common Channel Intra-office signalling
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GTE = General telephone & electric
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(Sprint,Telenet,Sylvania.)
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(c)opy freely I don't care
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all rights reserved
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The Autodial.. of Autodial Associates
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Call The Works BBS - 1600+ Textfiles! - [914]/238-8195 - 300/1200 - Always Open
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