Ricoh FACSIMILE FAX77 Field Service Manual page 71

Bit Switch 3
BIT FUNCTION
Transmission level from modem
Bit 0
0 0: 0 1: -8dB
1 Bit 1 0: 0 1: -4dB
Bit 2 0: 0 1: -2dB
2
Bit 3 0: 0 1: -1dB
3
Bad connection prevention method
4 Bit 5 Bit 4 Setting
0 0 None
1 RTI/CSl non-reception
5 0
1 0 CSI check
1 1 RTI/CSl non reception
Cable equalizer (tx mode)
6 Bit 7 Bit 6 Setting
0 0 0
1.8 km [2.9 miles]
7 0 1
1 0 3.6 km [5.8 miles]
1 1 7.2 km [11.5 miles]
DATA
The tx modem level is the sum of the values specified by
these four bits, which control attenuation in the Analog Front
End IC on the FCU.
(0,1), (1,1) - The machine will not transmit if the other end
does not send an RTI or CSI to identify itself.
(1,0) - The machine will not send if the received CSI is not the
same as the telephone number dialled. This does not work
when dialling with the handset.
(0,0) - Nothing is checked; transmission will always take
place.
Adjust these bits if there is signal loss because of the length of
wire between the modem and the telephone exchange.
2-40
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