Comtrol AT Command Set Rev A User Manual
Page 180
AT Commands Reference Manual
Conexant
100722B
5-8
Initiate Page Transmission
Phase B DCE polled response:
[+FCSI:
- if new CSI received
[+FDIS:
+FDCS:
CONNECT
- when ready for data
After placing a call, or after finishing a document exchange, the DTE may command the
DCE to re-enter T.30 Phase B to attempt to negotiate a document transmission.
Continue a Page
CONNECT
The DTE may issue more than one +FDT command for a given page, so that different
files may be concatenated together. These files must have the same format.
Phase C Data Framing
Phase C data must be presented to the DCE in stream mode. The DCE expects Phase C
data to follow until it detects
the stream as described in Section 6.1.2.
The DCE will acknowledge the end of the data by returning the OK result code to the
DTE.
If there is data underrun before the next +FDT or +FET= command, the DCE will zero-
fill the pad as per T.4 until the Phase C timeout (+FPHCTO) is reached, or until more
data is received. The DCE appends an RTC pattern to the transmit data after an +FET=
command is received from the DTE.
Phase C Data Format
The Phase C data will be of the format specified by the negotiated T.30 DCS frame. The
+FDCS:
described in Table 5-2.
The DCE will use the negotiated minimum Scan Time parameter from the DCS frame,
and insert sufficient fill bits to pad each line to the minimum scan time. This is reported
in the +FDCS:ST subparameter.
If the DCE finds more than one consecutive EOL in Phase C data (e.g., RTC), it will send
only one EOL.
1. Phase C data must conform to T.4 specifications.
2. The DTE need not include a final RTC, since the DCE will append an RTC in
response to an FET= command.
3. Some facsimile machines may treat two EOLs as an RTC.