Tainet T-288C User Manual page 125

A3-4
The DCE shall return to command state upon loss of carrier, and send the NO
CARRIER result code to the DTE.
The DCE shall obey the configured flow control from the DTE. If the DTE sends any
character to the DCE other than DC1 or DC3 while the DCE is in this mode, the DCE
shall enter command state and send the OK result code to the DTE.
A3.3.5 HDLC Transmit, +FTH=<MOD>
The command +FTH=<MOD> causes the DCE to transmit data framed in HDLC
protocol using the modulation mode selected. <MOD> may have the values shown in
section 1.1.
The DCE will send the CONNECT result code to the DTE, and transmit signal
converter training (if required) followed by flags until the first byte of data is sent by
the DTE.
When the buffer becomes empty the DCE shall compute and append the Frame Check
Sequence (FCS) and a closing flag to the frame. The DCE will insure that the
minimum number of flags required by T.30 are sent before the data from the DTE
begins to be
transmitted.
The DCE shall check the Final Frame bit in the control field of each frame; this is the
5th received bit of the second byte of each frame. If the Final Frame bit is 1, the DCE
shall cease transmitting after the frame is sent, return to command state, and send the
OK result code to the DTE. If the Final Frame bit is 0, the DCE shall send the
CONNECT result code to the DTE and continue to transmit flags until one of the
following actions is taken by the DTE:
* If the DTE sends additional data, the DCE shall transmit another frame.
* If the DTE sends only <DLE> <ETX> (a null frame), the DCE shall turn off
transmit carrier and send the OK result code to the DTE.
* If 5 seconds elapses from the time when the DCE reported the CONNECT result
code without any additional data transmitted from the DTE, the DCE shall turn off
transmit carrier, return to command mode, and send the ERROR result code to the
DTE.
The DCE performs HDLC transparency functions and FCS generation while in this
mode.
The DCE buffers data in HDLC transmit mode. The DCE will use the configured
method of flow-control to pause the DTE as necessary.
AUXILIARY SUMMARY FOR FAX FUNCTION