User guide

4 AT Commands, S-Registers, and Result Codes
42
Register Unit Range Default Description
modem does not time out, and continues to
attempt to deliver data in the buffer until
the connection is lost or the data is delivered.
S46 decimal 136, 138 138 Enables or disables data compression:
136 Error correction without compression.
138 Error correction with compression.
S48 decimal 0, 7, 128 7 Enables or disables LAPM negotiation. An
invalid value is treated as a 128 value.
0 Disables negotiation and proceeds with
LAPM.
7 Enables negotiation.
128 Disables negotiation and proceeds at
once with the fallback action specified
in S36. Can be used to force MNP.
S86 decimal 0, 3-23 21 When the modem issues a NO CARRIER
result code, a value is written to this register
to help determine the reason for the failed
connection. S86 records the first event that
contributes to a NO CARRIER message. Use
the S86? command to read the value.
0 Normal disconnect; no error occurred.
3 Call Waiting caused disconnect.
4 Physical carrier loss.
5 No error correction at the other end.
6 No response to feature negotiation.
7 This modem is async only; the other is
sync only.
8 No framing technique in common.
9 No protocol in common.
10 Bad response to feature negotiation.
11 No sync information from remote.
12 Normal disconnect initiated by the
remote modem.
13 Retransmission limit reached.
14 Protocol violation occurred.
15 Lost DTR.
15 3 RETRAINS OREXCESSIVE
RETRANSMISSIONS WHEN NO DTR.
16 Received GSTN cleardown.
17 Inactivity time out.
18 Speed not supported.
19 Long space disconnect.
20 Key abort disconnect.
21 Clears previous disconnect reason.
22 No connection established.
23 Disconnect after 3 retrains.