User's Manual

bit 0,1 Compress selection %Cn.
0 0 Disable %C0.
0 1 MNP 5 %C1.
1 0 V.42 bis %C2.
1 1 MNP 5 and V.42 bis (%C3)
bit 6,2 Auto retrain %En.
0 0 Retrain disable %E0.
0 1 Retrain enable %E1.
1 0 Fallback/fall forward enable (%E2).
bit 3 Modem-to-modem flow control \G.
0 Disable \G.
1 Enable \G1.
bit 4 Block mode control \Ln.
0 Store mode \L0.
1 Block mode \L1.
bit 5 Reserved.
bit 7 Enable fallback to V.22bis/V.22 (-Qn).
0 Disable (-Q0).
1 Enable (-Q1).
S46 Protocol Selection
This register controls whether the modem tries to use data compression when the modem establishes an
error corrected link. The default is for the modem to use data compression (138).
Value Description
136 Execute error correction protocol with no compression.
138 Execute error correction protocol with compression.
S48 V.42 Negotiation Action
Value Description
0 Disable negotiation: bypass the detection and negotiation phases.
7 Enable negotiation.
128 Disable negotiation: bypass the detection and negotiation phases.
S82 Break Handling Option
S82 is for compatibility purposes only, changing this register will not 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
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.
S86 = 13 Remote modem does not respond after 10 retransmission of
the same message.
S86 = 14 Protocol violation.
S91 PSTN Transmit Attenuation Level