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Sharp FO-475TH User Manual

Page 51

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UX-258TH
FO-475TH

Signal Name

Description

CML

Line connecting relay and DP generating relay

(The circuit is located

H: Line make

in the TEL/LIU PWB.)

L: Line break

SP MUTE

Speaker tone mute control signal

(The circuit is located

H: Muting (Power down mode)

in the TEL/LIU PWB.)

L: Muting cancel (Normal operation)

Handset reception mute control signal

TEL MUTE

H: Muting
L: Muting cancel

Speaker volume control signal,

VOL A VOL B VOL C matrix

VOL A
VOL B
VOL C

(The circuit is located

in the control PWB.)

TXCONT

TXOUT mute signal

(The circuit is located

L: Signal sending, when transmitting

in the control PWB.)

H: During reception, transmission mute,

(during standby)

GAIN-C

Reception gain switching signal

(The circuit is located

H: When connected to line, 1: 1 gain

in the control PWB.)

L: When not connected to line, HIGH gain

BZCONT

Speaker output signal switching

(The circuit is located

H: Buzzer signal output

in the control PWB.)

L: When monitoring line signal

5. Externally connected TEL OFF HOOK detection circuit section

The circuit current detection is turned on together with OFF HOOK
of main body or OFF HOOK of externally connected TEL. ON of
CML OFF is judged as OFF HOOK of externally connected TEL.

6. CI detection circuit

CI is detected by the photocoupler which is integrated in series in
the primary side TEL circuit well proven in the existing unit.

7. Signal/DTMF transmission level & receiving level

Signal transmission level setting: ATT 7 dB Circuit output: 7 dBm.

DTMF transmission level setting: HF -6.0 dBm LF -7.0 dBm
Thus, set the level.

Attenuation in the LIU section of the receiving level is degigned at
-6 dBm. (The modem and circuit error are not included.)

7. Signal selection

The following signals are used to control the transmission line of TEL/
FAX signal. For details, refer to the signal selector matrix table.

[Control signals from output port]

5 – 9

OUTPUT

VOL A

VOL B

VOL C

OH-HOOK

Receiving

X0

L

L

L

X1

H

L

L

X2

L

H

L

HIGH

X3

H

H

L

MIDDLE1

X4

L

L

H

MIDDLE2

X5

H

L

H

MIDDLE3

X6

L

H

H

LOW

X7

H

H

H

OUTPUT RINGER BUZZER

DTMF

ICM/OGM

X0

HIGH

X1

HIGH

MIDDLE1

X2

MIDDLE2

X3

MIDDLE

HIGH

MIDDLE3

X4

FIXED MIDDLE1

X5

MIDDLE2

LOW

X6

MIDDLE3

X7

LOW

LOW

The volume settings of ON-HOOK receiving,

DTMF and ICM/OGM must be performed to-
gether. (The setting of RINGER must be per-
formed separately.)

This manual is related to the following products: