ZyXEL Communications Comet 3356, User Manual

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44 Status Registers & Result Codes
This register specifies the delay between the modem's receipt of the H command to
disconnect (or ON-to-OFF transition of DTR if the modem is programmed to follow the
signal), and the disconnect operation. Applicable to error-correction connection only.
This register can be used to ensure that data in the modem buffer is sent before the
modem disconnects.
1. If S38 is set to a value between 0 and 254, the modem will wait that number of
seconds for the remote modem to acknowledge all data in the modem buffer before
disconnecting. If time expires before all data is sent, the NO CARRIER result code will
be issued to indicate that data has been lost. If all data is transmitted prior to time-out,
the response to the H0 command will be OK.
2. If S38 is set to 255, the 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 - 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. (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.
Value Description
0 Disable negotiation: bypass the detection and negotiation phases.
7 Enable negotiation. (default)
128 Disable negotiation: bypass the detection and negotiation phases.
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.
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