29
0 0 = Retrain,fallback/fall forward
disabled (%E0) (Default)
0 1 = Retrain enabled (%E1)
1 0 = Fallback/fall forward enabled (%E2)
Bit3 :
Reserved
Bit4 :
Block mode control (\Ln)
0 = Stream mode (\L0) (Default)
1 = Block mode (\L1)
Bit5 :
Reserved
Bit7 :
Enable fallback to V.22bis/V.22(-Qn)
0 = Disabled (-Q0)
1 = Enabled (-Q1) (Default)
S46 - Data Compression Control
Controls selection of compression. The following actions are executed for the given values.
Range:
136 or 138
Default:
138
S46=136
Error correction protocol with no compression
S46=138
Error correction protocol with compression. (Default)
S48 - V.42 Negotiation Action
The V.42 negotiation process determines the capabilities of the remote modem. However, when the
capabilities of the remote modem are known and negotiation is unnecessary, this process can be bypassed
if so desired.
Range:
0,7, or 128
Default:
7
S48=0
Disable negotiation; bypass the detection and negotiation phases; and proceed
with LAPM.
S48=7
Enable negotiation. (Default)
S48=128
Disable negotiation; bypass the detection and negotiation phases; and proceed at
once with the fallback action specified in S36. Can be used to force MNP.
S82 - Break Handling Options
S82 is for compatibility purposes only, changing this register will not have any affect.
S86 - Call Failure Reason Code
When the modem issues a NO CARRIER result code, a value is written to this S -Register to help determine
the reason for the failed connection. S86 records the first event that contributes to a NO CARRIER message.
The cause codes are:
Range:
0,4,5,9,12,13, or 14
Default:
S86=0
Normal disconnect, no error occurred
S86=4
Loss of carrier
S86=5
V.42 negotiation failed to detect an error correction modem at the other
end
S86=9
The modems could not find a common protocol
S86=12
Normal disconnect initiated by the remote modem
