Ricoh SP 1200S Service Manual Page 271

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Worker Switch Settings (WSW)
SM 5-81 M085/M086
Service
Maintenance
5.3.21 WSW20
Selector No. Function Setting and Specifications
1 EP* tone prefix 0: OFF 1: ON
2
Overseas communications mode
(Reception)
0: 2100 Hz 1: 1100 Hz
3
Overseas communications mode
(Transmission)
0: OFF 1: Ignores DIS once.
4
5
Min. time length from reception of CFR
to start of transmission of video signals
No. 4 5
0 0 : 100 ms
0 1 : 200 ms
1 0 : 300 ms
1 1 : 400 ms
6
7
Not used.
8 Limitation on CNG detection 0: OFF 1: ON
* EP: Echo protection
Selector 1: EP tone prefix
Setting this selector to "1" makes the machine 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 useful when the machine fails to transmit at the V.29 modem speed
and always has to fall back to 4800 bps transmission.
The setting made by this selector takes effect only when the Overseas Mode is set to ON.
Selectors 2 and 3: Overseas communications mode
These selectors should be used if the machine malfunctions in overseas communications.
According to the communications error state, select the signal specifications.
Setting selector 2 to "1" allows the machine 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 machine to ignore a DIS signal sent from the called
station once in sending operation. This operation suppresses echoes since the first DIS
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