Specifications

Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5600SMI/MT5656SMI Reference Guide (S000306B) 85
Command: +FDR Begin or Continue Phase C Receive Data
Description: The +FDR command initiates transition to Phase C data reception. This can
occur after answering, dialing, a document is received, or a page is received.
The DCE reports the negotiated T.30 parameters, with the remote ID
information if available. When the DCE is ready to commence data transfer, it
issues a CONNECT response code. If the DCE cannot resume data transfer
because there is no more data, it responds OK. When the DTE is ready to
accept data, it issues an <DC2> character (018) to the DCE.
If the DTE issues an <XOFF> character to the DCE for flow control, the DCE
signals the DTE when its buffers are empty by sending a <DLE><DC2>
(<016><018>) character pair.
When the DCE delivers the last byte of a page, the DCE reports the Page
Transfer Status via the +FPTS:<ppr> response.
After a Page Transfer Status Report, the DCE reports the post page message
from the remote facsimile station via the +FET:<ppm> response which signals
the intentions of the remote station.
The DCE holds the post page response message to the remote facsimile
station (MCF, etc.), represented in the +FPTS parameter until the next +FDR
command. The DTE may modify the +FPTS parameter before issuing the
+FDR command which releases that message. The DTE must issue a +FDR
command to release Post Page Messages.
Syntax: +FDR <CR>
Default value: 3 seconds in some places
Initiate Document Reception
The +FDR command may be issued in Phase B after an answer command, or in Phase B after a previous
document.
The DCE response in stream mode is:
+FCFR when CFR sent
[+FTSI:<remote ID string>] if new TSI received
+FDCS:<T.30 subparameter string>] if new DCS
CONNECT
(<DC2> needed from DTE here)
<Phase C data stream>
<DLE><ETX>
+FPTS:<ppr>, <lc> [,<blc>, <cblc>]
+FET:<ppm>
OK
(DTE must issue +FDR command to release post page response)
Continue Document Reception
The DTE may issue a +FDR command in Phase D, which releases the post page message, and indicates
readiness to receive another page after receipt of a Multipage (+FET:0) or PPS-NULL (+FET:3) message.
The DCE response will be:
CONNECT
(<DC2> needed from DTE here)
<Phase C data stream)
<DLE><ETX>
+FPTS:<ppr>, <lc> [,<blc>, <cblc>]
+FET:<ppm>
OK
(DTE must issue +FDR command to release post page response)
If done receiving:
+FHNG: <hangup cause code>
OK
Continue page reception