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3.1.1 Functions of facilities on F-NET
The following describes the facilities and functions of the component ele-
ments on F-NET.
(1) Storage and conversion equipment (STOC)
• Stores image signals.
• Transmits and receives image signals with other STOCs.
• Stands by and calls again when the incoming call terminal is busy.
• Generates messages such as non-delivery notices.
• Converts the size of A5- and A4-size documents.
(2) Facsimile signal conversion and control equipment (FCAP)
• Transmits and receives image signals with facsimile terminals.
• Performs A/D conversion on image signals.
• Codes image signals and suppresses redundancy.
• Multiplexes image signals, and transmits them to STOC. Alternatively,
receives and separates digitized image signals from STOC.
• Appends the leading section of image signals with caller number
before transmitting the image signals to the facsimile terminal.
• Monitors the digital transmission line between the STOC and TS-FX.
(3) Tandem trunk electronic exchange (TS-FX) having facsimile com-
munications functions
• Switches and connects between the LS (or TS) and FCAP.
• Holds the subscriber data, and performs transmitter verification,
charging and recording of communications.
• Transmits non-ringing alert signals to the facsimile terminal.
(4) Toll exchange (TS)
• Switches and connects between the LS and TS-FX.
(5) Local exchange (LS)
• Switches and connect between the facsimile terminal and TS-FX (or
TS).
• Detects the caller number and transmits this information to the TS-FX.
• Connects to the facsimile terminal with the telephone bell in a non-
ringing state.
(Note 1) LS and TS share the subscriber telephone network.
(Note 2) A crossbar exchange (XB) or electronic exchange (DEX) are used
for LS and TS, and electronic exchange (DEX) is used for TS-FX.
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