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38 INTELLIGENT COMMUNICATION SYSTEMS
FIGURE 5.1 Data communication system.
5.2 FACSIMILE COMMUNICATION SYSTEM
Facsimile information is transmitted via a telephone line. The facsimile commu-
nication system was developed to transmit images at high speed. The structure of
the facsimile communication system is shown in Figure 5.2.
(1) TS-FX is a switching system for facsimile information. In Japan the num-
bering plan for facsimile communication system is 161 or 162.
(2) STOC is a storage system for facsimile information. Facsimile informa-
tion is stored at STOC temporarily before the information is transmitted via a high-
speed dedicated line to another STOC. STOC enables high-speed transmission of
facsimile information.
(3) FDIC performs code conversion, media conversion, and speed conversion,
for example, character-to-speech conversion or vice versa. Speed conversion is per-
formed when the processing speeds of source terminal and destination terminal are
different.
5.3 VIDEOTEX COMMUNICATION SYSTEM
The videotex communication system provides the facility for retrieving image
information. The system structure is shown in Figure 5.3.
