Specifications

1999 CANON INC. CANON SUPER G3 FAX BOARD-F1 REV.0 MAY 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

2-65

CHAPTER 2 OPERATION AND TIMING

4. Protocols

a. Late Start

At times, poor line condition can prevent the start of the V.8 procedure. What is called "late start"

is a procedure used to switch to the V.8 procedure after closing the line.

The receiving device switches to the V.8 procedure upon detection of a CM signal while it is

generating ANSam signals. If a switch to the V.8 procedure cannot be made (i.e., the transmitting

device does not send a CM signal) because of the existing line condition, the receiving device will

send a DIS signal including a "V.8 procedure" declaration. In response, the transmitting device will

send a CI signal, starting the V.8 procedure.

Figure 2-415 Late Start

Note:

The shaded signals need special attention among those in the procedure.

TX RX

ANSam

CNG

ANSam

DIS

CSI

NSF

DIS

CSI

NSF

(DIS identification not made)

The transmitting device sends a Ci signal to

the receiving device for an ANSam signal.

Line closed

The receiving device sends a DIS signal

including a "V.8 procedure" declaration.

V.8