Specifications

Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5600SMI/MT5656SMI Reference Guide (S000306B) 94
Command: +FBOR Data Bit Order
Description: This parameter controls the mapping between PSTN facsimile data and the
DTE-DCE link. There are two choices:
Direct: The first bit transferred to each byte on the DTE-DCE link is the
first bit transferred on the PSTN data carrier.
Reversed: The last bit transferred of each byte on the DTE-DCE link is
the first bit transferred on the PSTN data carrier.
There are two data types to control:
This command controls Phase C data (T.4 encoded data) transferred
during execution of +FDT or +FDR commands.
The following two codes are supported:
+FBOR=0 or 2 Selects direct bit order for Phase C data.
+FBOR=1 or 3 Selects reversed bit order for Phase C data.
This parameter does not affect the bit order of control characters generated by
the DCE.
Write syntax: +FBOR=<value>
Valid values: 0, 1, 2, or 3
Default value: 0
Command: +FAA Answer Parameter
Description: Fax adaptive answer operates only when +FCLASS=0.
Class 2 adaptive answer is implemented as follows:
First, a data mode handshake is attempted. If the DCE has been configured
for automode detection (using the +MS command), the DCE may try several
protocols before terminating attempts to make a data mode connection. This
can take as long as 6-8 seconds.
If the data mode connection attempt fails, a facsimile Class 2 connection is
assumed. When a connection is made as a result of the adaptive answer, the
DCE issues the DATA or FAX result code before the CONNECT or +FCON
message to inform the DTE of the connection type. After making a Class 2
connection, the DCE stays on-line rather than going into the command mode
as with a Class 1 connection.
Write syntax: +FAA=<value>
Valid values: 0 or 1
Default value: 0
+FAA=0 Constrains the DCE to answer as set by +FCLASS.
+FAA=1 Indicates that the DCE can answer and automatically determine
whether to answer as a Class 2 facsimile DCE or as a data
modem. If the DCE automatically switches, it modifies FCLASS
appropriately.
Command: +FBUF? Buffer Size
Description: The +FBUF parameter allows the DTE to determine the characteristics of the
DCE's data buffer. Data buffers are used for flow control. Use of the reported
values allow the DTE to transfer data without provoking XOFF.
Read syntax: +FBUF?
DCE response syntax: <bs>, <xoft>, <xont>, <bc>
where:
<bs> = total buffer size
<xoft> = XOFF threshold
<xont> = XON threshold
<bc> = current buffer byte count
Example: +FBUF?
512, 506, 500, 0