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3.1
F-NET
F-NET is organized as shown in the Fig. A-8 for the following reasons:
(1) Terminals and the network are considered to be integrated, and termi-
(2) Many services can be achieved and line usage efficiency improved by
(3) Adoption of digital transmission lines enables high-speed transmission
(4) Reasonable communications costs can be achieved by sharing existing
A–12
nal functions are concentrated as far as possible on the network to
improve terminal economy.
adopting a storage and conversion system.
of large volumes of data.
subscriber telephone network facilities.
STOC
F-NET
TS-FX
TS
PSTN
LS
FAX
: Digital transmission line
: 4 kHz transmission line
: Flow of call (example)
TS-FX: Tandem trunk electronic exchange having facsimile communications functions
TS: Tandem trunk exchange
LS: Subscriber exchange
STOC: Storage and conversion equipment
FCAP: Facsimile signal conversion and control equipment
(LCE: line control equipment, SIE: Storage converter interface equipment)
Fig. A-8 Configuration of F-NET
STOC
FCAP-SIE
FCAP-SIE
FCAP-LCE
FCAP-LCE
TS-FX
TS-FX
TS
LS
Digital network
TS-FX
Analog network
FAX
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