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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 82
T.30 Procedure Control Parameters
The fax modem makes decisions at several nodes in the T.30 procedure. These
parameters allow a host to sense or determine fax modem policy for these procedure decisions.
Page Transfer Status
Class 2.1 +FPS
Write syntax: + FPS=<ppr>
Values: 1, 2, 3
Default: 1
The +FPS parameter contains a value representing the post page response, including
copy quality and related end-of-page status. These values correspond to post page
response messages defined in T.30. The receiving modem sets this parameter after
it receives a page of Phase C data. The transmitting modem sets this parameter with
the status reported by the receiving station. The host may inspect or modify this
parameter.
The set of <ppr> values is defined in Table 3.6. These values are also reported by
the +FPS:<ppr> response to the +FDR command. The Multi-Tech implementation
does not support <ppr> values 4 and 5.
Table 3.6 Class 2.1 T.30 Post Page Response Message Codes
Value Mnemonic Description
1 MCF Page good.
2 RTN Page bad; retrain requested.
3 RTP Page good; retrain requested.
4* PIN Page bad; retrain requested; interrupt request accepted.
5* PIP Page good; interrupt request accepted.
The modem may set this parameter to values 1, 2 or 3 based on its own copy quality
checking or access to received signal quality. The modem sets this parameter to a
value of 1 if copy quality checking is disabled (+FCQ=0).
A receiving host may do its own copy quality checking or decide to request a
procedure interrupt from the remote station. The host will receive a report of the copy
quality <ppr> as part of the +FPS:<ppr>,<lc>,<blc>,<cblc> response. The host may
modify this result before it issues the next action command (e.g., +FDR), which
releases the corresponding post page response to the remote facsimile station.
Class 2 +FPTS
Write syntax: + FPTS=<ppr>
Valid values: 1, 2, 3, 4, 5
Default value: 1
Except for the name and the range of values, the Class 2 parameter is identical to the
Class 2.1 parameter.