WSW20 (Overseas communications mode setting)
Selector | Function |
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1 | EP* tone prefix |
| 0: | OFF |
| 1: | ON |
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2 | Overseas communications mode |
| 0: | 2100 Hz | 1: | 1100 Hz | |
(Reception) |
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3 | Overseas communications mode |
| 0: | OFF |
| 1: | Ignores DIS once. |
(Transmission) |
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| No. | 4 | 5 |
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4 | Min. time length from reception of |
| 0 | 0 | : | 100 ms |
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CFR to start of transmission of |
| 0 | 1 | : | 200 ms |
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5 | video signals |
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| 1 | 0 | : | 300 ms |
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| 1 | 1 | : | 400 ms |
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| No. | 6 | 7 |
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6 | Chattering elimination for CNG |
| 0 | 0 | : | A (During CNG ON and OFF) | |
7 | detection |
| 0 | 1 | : | B (During CNG OFF only) | |
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| 1 | X | : | C (No elimination) | |
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8 | CNG detection on/off |
| 0: | OFF |
| 1: | ON |
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* EP: Echo protection
•Selector 1: EP tone prefix
Setting this selector to "1" makes the equipment transmit a 1700 Hz echo protection (EP) tone immediately preceding training in V.29 modulation system to prevent omission of training signals.
Prefixing an EP tone is effective when the equipment fails to transmit at the V.29 modem speed and always has to fall back to 4800 bps transmission.
•Selectors 2 and 3: Overseas communications mode
These selectors should be used if the facsimile equipment malfunctions in overseas communications. According to the communications error state, select the signal specifications.
Setting selector 2 to "1" allows the equipment to use 1100 Hz CED signal instead of 2100 Hz in receiving operation. This prevents malfunctions resulting from echoes, since the 1100 Hz signal does not disable the echo suppressor (ES) while the 2100 Hz signal does.
Setting selector 3 to "1" allows the equipment to ignore a DIS signal sent from the called station once in sending operation. This operation suppresses echoes since the first DIS signal immediately follows a 2100 Hz CED (which disables the ES) so that it is likely to be affected by echoes in the disabled ES state. However, such a disabled ES state will be removed soon so that the second and the following DIS signals are not susceptible to data distortion due to echoes. Note that some models when called may cause error by receiving a
•Selectors 8: CNG detection on/off
If this selector is set to "1," the equipment detects a CNG signal according to the condition preset by selectors 2 and 3 of WSW18 after a line is connected. If it is set to "0," the equipment detects a CNG signal as long as the line is connected.
V - 33
