Ricoh Type M12 Field Service Manual page 147

2 Not Used
ECM frame size
3 0: 256 bytes
1: 64 bytes
CTC transmission conditions
0: After one PPR signal received
4
1: After four PPR signals received
(ITU-T standard)
Modem rate used for the next page
after receiving a negative code
5
(RTN or PIN)
0: No change 1: Fallback
6 Not used
Select detection of reverse polarity
in ringing
7
0: Off
1: On
No Function
0-3 Training error detection threshold
Do not change the settings.
Keep this bit at "0" in most cases.
0: When using ECM in non-standard (NSF/NSS) mode,
the machine sends a CTC to drop back the modem rate
after receiving a PPR, if the following condition is met in
communications at 14.4, 12.0, 9.6, and 7.2 kbps.
Ntransmit = Number of transmitted frames
Nresend = Number of frames to be retransmitted
1: When using ECM, the machine sends a CTC to drop
back the modem rate after receiving four PPRs.
PPR, CTC: These are ECM protocol signals.
This bit is not effective in V.34 communications.
1: The machine's tx modem rate will fall back before
sending the next page if a negative code is received.
This bit is ignored if ECM is being used.
Do not change the settings
This switch is used to prevent reverse polarity in ringing
on the phone line (applied to PSTN-G3 ringing). Do not
change this setting
0: No detection
1: Detection (Japan and Korea only)
G3-2 Switch 04 (SP No. 1-106-005)
0 - F (Hex); 0 - 15 bits
If the number of error bits in the received TCF is below
this threshold, the machine informs the sender that
training has succeeded.
Bit Switches - 5
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