Sharp FO-DC635U Service Manual Download Page 52

Page: 52 / 166

FO-DC635U

2 – 33

SW29 No. 4 Non-modulated carrier in V.29 transmission mode

Though transmission of a non-modulated carrier is not required for
transmission by the V29 modem according to the CCITT Recommen-
dation, it may be permitted to send a non-modulated carrier before the
image signal to avoid an echo suppression problem. It may be useful
for overseas communication to avoid an echo suppression problem, if
set to 1.

SW29 No. 5 CNG send when manual TX

CNG signal sending ON/OFF in case of manual transmission is set.

SW29 No. 6 Protocol monitor

Normally set to "0". If set to "1", communication can be checked, in
case of troubles, without using a G3 tester or other tools.

When communication FSK data transmission or reception is made, the
data is taken into buffer. When communication is finished, the data
analyzed and printed out. When data is received with the line monitor
(SW7-No. 7) set to "1" the reception level is also printed out.

SW29 No. 7 Line monitor

Normally set to "0". If set to "1", the transmission speed and the recep-
tion level are displayed on the LCD. Used for line tests.

SW29 No. 8 Reserved

Set to "0".

SW30 No. 1, No. 2 Compromised equalizer

The specific line equalizer is inserted.

SW30 No. 3 H2 mode

Used to determine H2 mode (15sec transmission mode). When set to
OFF, H2 mode is inhibited even though the transmitting machine has
H2 mode.

SW30 No. 4 ~ No. 8 Signal transmission level

Used to control the signal transmission level in the range of –0dB to –
31dB.

SW31 No. 1, No. 2 CED tone signal interval

For international communication, the 2100Hz CED tone may act as an
echo suppresser switch, causing a communication problem. Though
this soft switch is normally set to "0", it should be set to "1" so as to
change the time between CED tone and DIS signal from 75ms to
500ms to eliminate the communication problem caused by echo.

SW31 No. 3 Equalizer freeze

This switch is used to perform reception operation by fixing the equal-
izer control of modem for the line which is always in an unfavorable
state and picture cannot be received. Usually, the control is executed
according to the state of line where the equalizer setting is changed
always.

SW31 No. 4 Equalizer freeze conditions

Setting which specifies SW9 No.3 control only in condition of 7200bps
modem speed.

SW31 No. 5 ~ No. 8 Reserved

Set to "0".

SW32 No. 1 Reserved

Set to "1".

SW32 No. 2 Reserved

Set to "0".

SW32 No. 3 Reserved

Set to "1".

SW32 No. 4 ~ No. 6 Reserved

Set to "0".

SW32 No. 7 Reserved

Set to "1".

SW32 No. 8 Reserved

Set to "0".

SW33 No. 1 ~ No. 4 V.34 mode transmission speed

Used to determine the initial modem speed when communication
method is V.34 transmission mode.

SW33 No. 5 ~ No. 8 V.34 mode receiving speed

Used to determine the initial modem speed when communication
method is V.34 reception mode.

SW34 No. 1 Reserved

Set to "1".

SW34 No. 2 V.34 mode function

Used to select the V.34 mode for communication when set to “1”, com-
munication method is V.34 mode.

SW34 No. 3 V.34 control channel communication speed

Used to select the control channel communication speed for V.34
mode.

SW34 No. 4, No. 5 EOL detection timer

Used to make a choice of whether to use the 25-second or 13-second
timer for detection of End of line This is effective to override communi-
cation failures with some facsimile models that have longer End of line
detection.

SW34 No. 6, No. 7 Processing of DIS reception after DIS transmis-
sion

When receiving, operation in case of DIS reception after DIS transmis-
sion is selected. Retransmitting command: To retransmit DIS in disre-
gard of DIS reception.

Breaking circuit: To break circuit instantly. (Abnormal finish)

T. 30: To operate in accordance with T.30.

T. 30+a: To operate in accordance with T.30+a. (To operate differently
according to cases.)

SW34 No. 8 Reserved

Set to "0".

SW35 No. 1 ~ No. 5 DTMF output level (High)

To set the level to output high group DTMF signals. –15 to 0 dBm (0.5
dBm unit)

SW35 No. 1 ~ No. 5 DTMF output level (Low)

To set the level to output low group DTMF signals. –15 to 0 dBm (0.5
dBm unit)

SW36 No. 6 ~ No. 8 Reserved

Set to "0".

SW36 No. 2 ~ No. 8 Reserved