Canon fax basic 2000 サービスマニュアル

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G3 FACSIMILE COMMUNICATIONS

6.8

Structure of Binary Signals

There are various types of binary signals, and I am sure that you now

understand that they each have special meanings. Here, let’s describe the

structure of binary signals in further detail.

Binary signals consist of a “preamble signal” that prefixes the binary sig-

nal and “binary coded information”. Binary coded information comprises

one or multiple frames (HDLC frame). Each frame comprises some

“sequences” and “fields.” This structure is called an HDLC structure.

Fig. 5-78   Structure of Binary Signal

NSS

Transmission 

→

 Reception

Binary signal

Signal (including user name and maker code) that communicates to the

other party that transmission will be performed using a function other

than that recommended by 

 (functions unique to manufacturer

that are not provided in DCS).

TSI

Transmission 

→

 Reception

Binary signal

Signal for communicating the telephone number of the transmitter to the

other party.

CED

NSF

CSI

DIS

NSS

TSI

DCS

Preamble

HDLC information field

Transmitting

side

Receiving

side

Binary coded information

Flag

sequence

Flag

sequence

Address

field

Control

field

Facsimile

control field

Facsimile

information field

Frame

checking

sequence

Flag

sequence