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 | LF |
Thus, set the level. |
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•Attenuation in the LIU section of the receiving level is degigned at
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]
Signal Name |
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| Description |
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CML | Line connecting relay and DP generating relay |
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(The circuit is located | H: Line make |
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in the TEL/LIU PWB.) | L: Line break |
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SP MUTE | Speaker tone mute control signal |
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(The circuit is located H: Muting (Power down mode) |
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in the TEL/LIU PWB.) L: Muting cancel (Normal operation) |
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| Handset reception mute control signal |
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TEL MUTE | H: Muting |
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| L: Muting cancel |
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| Speaker volume control signal, |
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| VOL A VOL B VOL C matrix |
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| OUTPUT | VOL A |
| VOL B | VOL C |
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| Receiving |
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| X0 | L |
| L | L |
| — |
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| X1 | H |
| L | L |
| — |
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| X2 | L |
| H | L |
| HIGH |
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| X3 | H |
| H | L |
| MIDDLE1 |
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VOL A | X4 | L |
| L | H |
| MIDDLE2 |
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VOL B | X5 | H |
| L | H |
| MIDDLE3 |
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VOL C | X6 | L |
| H | H |
| LOW |
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(The circuit is located | X7 | H |
| H | H |
| — |
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in the control PWB.) |
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| OUTPUT | RINGER |
| BUZZER | DTMF |
| ICM/OGM |
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| X0 | — |
| — | — |
| HIGH |
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| X1 | HIGH |
| — | — |
| MIDDLE1 |
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| X2 | — |
| — | — |
| MIDDLE2 |
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| X3 | MIDDLE |
| — | HIGH |
| MIDDLE3 |
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| X4 | — |
| FIXED | MIDDLE1 |
| — |
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| X5 | — |
| — | MIDDLE2 |
| LOW |
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| X6 | — |
| — | MIDDLE3 |
| — |
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| X7 | LOW |
| — | LOW |
| — |
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•The volume settings of
TXCONT | TXOUT mute signal | |
L: Signal sending, when transmitting | ||
(The circuit is located | ||
H: During reception, transmission mute, | ||
in the control PWB.) | ||
(during standby) | ||
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| 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 |
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