Gestetner A193 Service Manual page 653

G3 Switch 03
No FUNCTION
0 DIS detection number
(Echo countermeasure)
0: 1
1: 2
1 Not used
2
3 ECM frame size
0: 256 bytes
1: 64 bytes
4 CTC transmission conditions
0: After one PPR signal
received
1: After four PPR signals
received (ITU-T standard)
5 Modem rate used for the next
page after receiving a
negative code (RTN or PIN)
0: No change 1: Fallback
6 Not used
7
G3 Switch 04
FUNCTION
0 Training error detection
to threshold
3
4 Not used
to
7
(A639)
COMMENTS
0: The machine will hang up if it receives the same DIS
frame twice.
1: Before sending DCS, the machine will wait for the
second DIS which is caused by echo on the line.
Do not change the setting.
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.
√    ≤ N
N
Transmit Resend
N - Number of transmitted frames
Transmit
N - Number of frames to be retransmitted
Resend
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.
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 setting.
COMMENTS
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.
Do not change the settings.
4-49
BIT SWITCHES
SM