112 lines
5.9 KiB
Plaintext
112 lines
5.9 KiB
Plaintext
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+============================================================================+
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! !
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! BUSY VERIFICATION CIRCUIT part ][ By: The Wizard of the World of Cryton!
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! !
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+============================================================================+
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[1]: Busy Verification circuits allow an operator to bridge the path between
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two connected ports, to verify that either or both are busy, and to speak to
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parties using the monitored ports (3-way conference). These circuits are
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considered to be service port circuits. One complete busy verification circuit
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consists of two PWBA's: 814434-026 and 814434-046. This figure shows the
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difference between a normal call connection and a busy verification connection
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as well as showing the interconnection of circuits associated with a busy
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verification call.
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Normal Call Connection Versus Busy Verification Connection
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----------------------------------------------------------
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NORMAL CALL CONNECTION:
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+----------+ +----------+ +-----------+
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+------+ | | | | | TIMESLOT |
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Phone<--->|PORT A|<------>|- - - - - |<--->|- - - - - |<--->|- - - + |
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+------+ |PORT GROUP| |PORT GROUP| | ! |
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-------+ |MUX/DEMUX | | CONTROL | | ! |
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Phone<--->|PORT A|<------>|- - - - - |<--->|- - - - - |<--->|- - - + |
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+------+ | | | | |INTERCHANGE|
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+----------+ +----------+ +-----------+
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BUSY VERIFICATION CONNECTION:
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+----------+ +----------+ +-----------+
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+------+ | | | | | TIMESLOT |
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Phone<--->|PORT A|<------>|- - - - - |<--->|- - - - - |<--->|- - - + |
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+------+ |PORT GROUP| |PORT GROUP| | ! |
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-------+ |MUX/DEMUX | | CONTROL | | ! |
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Phone<--->|PORT A|<------>|- - - - - |<--->|- - - - - |<--->|- + + |
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+------+ | | | | | ! ! |
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| | | | | ! ! |
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BUSY +--------+ | | | | | ! ! |
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VERIFI- | + - - -|<----->|- - - - - |<--->|- - - - - |<--->|- + ! |
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CATION | * - - -|<----->|- - - - - |<--->|- - - - - |<--->|- - - + |
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CURCUIT | + - - -|<----->|- - - - - |<--->|- - - - - |<--->|- + |
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+--------+ | | | | | ! |
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| | | | | ! |
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TO/FROM +------+ | | | | | ! |
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MONITOR<->|PORT C|<------>|- - - - - |<--->|- - - - - |<--->|- + |
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ING OP. +------+ | | | | |INTERCHANGE|
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+----------+ +----------+ +-----------+
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[2]: The busy verification circuit consists of three operational amplifiers
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and three sets of XMT OUT and RCV IN leads. See diagram...
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Busy Verification Circuit, Block Diagram
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----------------------------------------
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Amplifier A
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|\ +-----+
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+------------>| \_____XMT_OUT_\| |
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! +------->| / /| |
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! ! |/ |CODEC|
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! ! RCV IN | |
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! ! +---------------------| |
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! ! ! Amplifier B +-----+
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! ! ! |\ +-----+
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*------------->| \____XMT_OUT_\| |
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| ! *---->| / /| |
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! ! ! |/ |CODEC|
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! ! ! RCV IN | |
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! *-------------------------| |
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! ! ! Amplifier C +-----+
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! ! ! |\ +-----+
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! ! +---->| \____XMT_OUT_\| |
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! +-------->| / /| |
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! |/ |CODEC|
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! RCV IN | |
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+------------------------------| |
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+-----+
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The inputs to each amplifier are the RCV IN signals from the two sets of leads
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not associated with that amplifier. Each RCV IN signal is the output of one of
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three CODEC's on PWBA 814434-026. The output of each amplifier is an XMT OUT
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signal, which is the input to one of three CODEC's. With this arrangement, two
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of the sets of busy verification circuit leads are switched into the two
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conversation paths that provide two-way communication between the two ports to
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be monitored. Signals on both paths then are fed into the amplifier associated
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with the third set of leads. This third set of leads is switched to the port
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that serves the monitoring operator. Thus, the XMT OUT lead from the third set
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carries voice signals from both monitored ports for transfer to the operator.
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The RCV IN lead of the third set carries the operators message to the parties
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on both monitored ports.
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[3]: Each of the operational amplifiers has unity gain. A coupling capacitor
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and voltage divider on the RCV IN analog input provides the proper frequency
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response and signal level for the amplifier inputs.
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[4]: The busy verification circuit is an optional and nonredundant portion of
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line and/or line and service group cells, using three port positions per cell.
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A component failure on this circuit never affects service to more then three
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ports and, therefore, is considered to be a minor failure. A component failure
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can cause loss of busy verification monitoring and/or loss of voice
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transmission through up to three ports.
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Thats all for this time, stay tuned for Part 3!!! Phreak on dudes!
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\
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-===THE=WIZARD=]>>>)}
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/
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(*)- The *ELITE* Phreaker's Club -(*)
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