Ricoh B079, Service Manual

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BIT SWITCHES
B547 92 SM
G4 Parameter Switch 05
No. FUNCTION COMMENTS
0-3 Not used Do not change these settings.
4 B-channel T3 timer
0: 30s 1: 57s
1: This switch is useful when used in
combination with the Communication Bit
SW 07 bit 4. This is to cope with
communication problems where G4
communication fails on the ISDN B-
channel.
Normally keep this bit at 1.
5-7 Not used Do not change these settings.
G4 Parameter Switch 06
No. FUNCTION COMMENTS
0 Layer 3 protocol
0: ISO8208 1: T.70NULL
Set this bit to match the type of layer 3
signaling used by the ISDN.
The dedicated parameters have the same
setting for specific destinations.
Normally keep this bit at 0.
1-7 Not used Do not change these settings.
G4 Parameter Switch 07
No. FUNCTION COMMENTS
0
to
3
Packet size
Bit 3 2 1 0 Value
0 1 1
1 128
1 0 0 0 256
1 0 0 1 512
1 0 1 0 1024
1 0 1 1 2048
This value is sent in the CR packet. This value
must match the value stored in the other
terminal, or communication will stop (CI will be
returned). If the other end returns CI, check
the value of the packet window size with the
other party.
Note that this value must be the same as the
value programmed for the transport block size
(G4 Parameter Switch 0B, bits 0 to 3).
Normally, do not change the default setting.
4-7 Not used Do not change these settings.
G4 Parameter Switch 08
No. FUNCTION COMMENTS
0
to
3
Packet window size
Bit 3 2 1 0 Value
0 0 0
1 1
0 0 1 0 2
and so on until
1 1 1 1 15
This is the maximum number of
unacknowledged packets that the machine
can send out before having to pause and wait
for an acknowledgement from the other end.
Normally this should be kept at 7.
4-7 Not used Do not change these settings.