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Appendix F 145
2 RING
The modem sends this result code when incoming ringing is detected on the line.
3 NO CARRIER
The modem sends this result code when attempting to establish a call if:
1. Ringback is detected and later ceases but no carrier is detected within the period of time determined by
register S7, or
2. No ringback is detected within the period of time determined by register S7.
This result code is also used when the modem autodisconnects due to loss of carrier.
Under X0, if busy tone detection is enforced, this result code is used as a response to the detection of busy or
circuit busy. Under X0, if dial tone detection is enforced or selected, this result code is used to indicate that dial
tone has not been detected.
4 ERROR
The modem returns this result code if the command line contains a syntax error or it is unable to execute a
command contained in the command line. It is issued if a command does not exist or if the parameter supplied
is outside the permitted range.
6 NO DIAL TONE
For X2 and X4, the modem sends this result code if it has been instructed to wait for dial tone during dialing but
none is received.
7 BUSY
For X3 and X4, if busy tone detection is enforced, the modem sends this result code when attempting to
originate a call if the busy (engaged) signal is detected on the line.
8 NO ANSWER
The modem sends this result code when attempting to originate a call if the @ dial modifier is used and the
modem does not detect silence before the expiration of the timer S7.
5, 10-15, and 24-33 Connect Rate (see Table 6, page 10 for rate)
For X1, X2, X3, and X4, the modem sends this result code when:
1. The line speed is the speed following the connect and the modem has been instructed to report the line
speed to the DTE upon connecting by the W2 command.
2. The DTE speed is 2400 bits/s and the modem has been instructed to report the DTE speed to the DTE upon
connecting using the W0 command.