Troubleshooting guide

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C-10 Modem Commands
Table C-3 Continued
Command Description
+FTH=n Transmit Data with HDLC Framing. AT+FTH causes the modem to transmit data framed
in HDLC protocol using the modulation defined below:
Parameters: n = 3, 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146
n = 3 V.21 Channel 2 300 bps
n = 24 V.27ter 2400 bps
n = 48 V.27ter 4800 bps (default)
n = 72 V.29 7200 bps
n = 73 V.17 7200 bps
n = 74 V.17 7200 bps (short train)
n = 96 V.29 9600 bps
n = 97 V.17 9600 bps
n = 98 V.17 9600 bps (short train)
n = 121 V.17 12000 bps
n = 122 V.17 12000 bps (short train)
n = 145 V.17 14400 bps
n = 146 V.17 14400 bps (short train)
An ERROR response code results if this command is issued while the modem is on-hook.
+FRH=n Receive Data with HDLC Framing. AT+FRH causes the modem to receive HDLC framed
data using the modulation defined below:
Parameters: n = 3, 24, 48, 72, 73, 74, 96, 97, 98, 121, 122, 145, 146
n = 3 V.21 Channel 2 300 bps
n = 24 V.27ter 2400 bps
n = 48 V.27ter 4800 bps (default)
n = 72 V.29 7200 bps
n = 73 V.17 7200 bps
n = 74 V.17 7200 bps (short train)
n = 96 V.29 9600 bps
n = 97 V.17 9600 bps
n = 98 V.17 9600 bps (short train)
n = 121 V.17 12000 bps
n = 122 V.17 12000 bps (short train)
n = 145 V.17 14400 bps
n = 146 V.17 14400 bps (short train)
An ERROR response code results if this command is issued while the modem is on-hook.