class2.txt

使用efax的fax工具程序

|      54  |  No response to EOP repeated 3 times            |
|      55  |  Invalid response to EOM                        |
|      56  |  No response to EOM repeated 3 times            |
|      57  |  Invalid response to EOM                        |
|      58  |  Unable to continue after PIN or PIP            |
|----------|-------------------------------------------------|
|   70-89  |  RECEIVE PHASE B HANGUP CODES                   |
|----------|-------------------------------------------------|
|      70  |  Unspecified Receive Phase B error              |
|      71  |  RSPREC error                                   | 
|      72  |  COMREC error                                   |
|      73  |  T.30 T2 timeout, expected page not received    |
|      74  |  T.30 T1 timeout after EOM received             |
|----------|-------------------------------------------------|
|   90-99  |  RECEIVE PHASE C HANGUP CODES                   |
|----------|-------------------------------------------------|
|      90  |  Unspecified Receive Phase C error              |
|      91  |  Missing EOL after 5 seconds                    |
|      92  |  Unused code                                    |
|      93  |  DCE to DTE buffer overflow                     |
|      94  |  Bad CRC or frame (ECM or BFT modes)            |
|----------|-------------------------------------------------|
| 100-119  |  RECEIVE PHASE D HANGUP CODES                   |
|----------|-------------------------------------------------|
|     100  |  Unspecified Receive Phase D errors             |
|     101  |  RSPREC invalid response received               |
|     102  |  COMREC invalid response received               |
|     103  |  Unable to continue after PIN or PIP            |
|----------|-------------------------------------------------|
| 120-255  |  RESERVED CODES                                 |
|------------------------------------------------------------|


7.5  SERVICE CLASS 2 PARAMETERS

All Service Class 2 parameters can be read, written, and tested for 
range of legal values by the DCE.  The general syntax is described in 
Section 7.1.

Group 3 FAX devices negotiate session parameters in DIS, DCS, and DTC 
frames.  The following parameters are provided to condition the 
facsimile DCE for the capabilities it will offer and to report the 
session settings negotiated.

The three primary T.30 session parameters are +FDCC, +FDIS and +FDCS.  
They are compound parameters, using values listed in Table 7-2.  Figure 
70-1 illustrates their relationships.

7.5.1  +FDCC, DCE CAPABILITIES PARAMETERS

Write Syntax:   +FDCC:VR,BR,WD,LN,DF,EC,BF,ST

Valid values    See Table 7-2

Default values  0,3,0,2,0,0,0,0  (RC96AC)
                0,5,0,2,0,0,0,0  (RC144AC)

+FDCC allows the DTE to sense and constrain the capabilities of the 
facsimile DCE from the choices defined in CCITT t.30 Table 2.  When 
+FDCC is modified by the DTE, the DCE copies +FDCC into +FDIS.

7.5.2  +FDIS, CURRENT SESSIONS CAPABILIIES PARAMETERS

Write Syntax:   +FDIS:VR,BR,WD,LN,DF,EC,BF,ST

Valid values    See Table 7-2

Default values  0,3,0,2,0,0,0,0  (RC96AC)
                0,5,0,2,0,0,0,0  (RC144AC)


The +FDIS parameter allows the DTE to sense and constrain the 
capabilities used for the current session.  The DCE uses +FDIS to 
generate DIS or DTC messages directly, and uses +FDIS and received DIS 
messages to generate DCS messages.

The DCE initializes the +FDIS parameter from the +FDCC parameter on 
initialization, when +FDCC is written, and at the end of a session.

7.5.4  +FLID=, LOCAL ID STRING

Write Syntax   +FLID="<local ID string>"

Valid values:   20 character ASCII string

Default value:  Empty

If FLID is not a null string, it generates a TSI or CSI frame.  Table 
3/T.30 includes digits 0-9, "+" and space.

If the DCE supports use of Table 3/t.30 only, the response to a +FLID=? 
command is "<20)(32, 43, 48-57)".  If the DCE supports printable ASCII 
<, the response is "(20)(32-127)<CRLF>"  The first "(20)" represents 
string length: the second (character values) field reports supported 
string values.

Notes:  1.  The string is saved in RAM.
        2.  Non-numeric characters are not filtered out.

7.5.5  +FCR, CAPABILITY TO RECEIVE

Write Syntax:  +FCR=<value>

Valid values:  1,0

Default values 0

+FCR=0 indicates that the DCE will not receive message data.  This can 
be sued when the DTE has insufficient storage.  The DCE can send and can 
be polled for a file.

+FCR is sampled in CCITT T.30 Phase A and Phase D

7.5.6  +FPTS=, PAGE TRANSFER STATUS

Write syntax:   +FPTS=<ppr>

Valid Values:   1,2,3,4,5

Default value:  0

7.5.7  +FCQ, COPY QUALITY CHECKING

Write Syntax:  +FCQ=<value>

Valid Values:  0

Default Value: 0

This parameter controls Copy Quality checking by a receiving facsimile 
DCE.

The DCE returns +FCQ=0 which indicates the DCE does no quality checking.  
The DCE will generate Copy Quality OK (MCF) responses to complete pages, 
and set +FPTS=1.

7.5.8  +FPHCTO, DTE PHASE C RESPONSE TIME-OUT

Write Syntax:   +FPHCTO=<value>

Valid Values:   0-255, 100 millisecond units

Default Value:  30

The +FPHCTO command determines how long the DCE will wait for a command 
after reaching the end of data when transmitting in Phase C.  When this 
time-out is reached, the DCE assumes there are no more pages and no 
documents to send.  It then sends the T.30 EOP response to the remote 
device.

7.5.9  +FAXERR, T.30 SESSION ERROR REPORT

Read Syntax:   +FAXERR=<table value>, read only

Valid values:  0-255, see table 7-5 for meaning

This read-only parameter indicates the cause of the hangup.  Table 7-5 
shows the valid values for this parameter as well as the meaning of the 
each value.  +FAXERR is set by the DCE at the conclusion of a fax 
session.  The DCE resets +FAXERR to 0 at the beginning of Phase A off-
hook time.

7.5.10  +FBOR, DATA BIT ORDER

Write Syntax:  +FBOR=<value>

Valid Values:  0,1

Default value:  0

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  selects direct bit order for Phase C data
  
  +FBOR=1  selects reversed bit order for Phase C data

Note that this parameter does not affect the bit order of control 
characters generated by the DCE.

7.5.11  +FAA, ANSWER PARAMETER

Write syntax:  +FAA=<value>

Valid values:   0,1

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, if modifies FCLASS 
appropriately.

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 A command), the DCE may try 
several protocols be 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, a result of the 
adaptive answer, the DCE issues the D or FAX result code before the 
CONNECT or +FCC message to inform the DTE of the connection type.  A 
making a class 2 connection, the DCE stays on-line rather than going 
into the command mode as with a Class 2 connection.

7.5.12  +FBUF?, BUFFER SIZE

Read syntax:   +FBUF?

DCE response syntax <bs>,<xoft>,<xont>,<bc> where:

  <bs> = total buffer size
  <xoft> = XOFF threshold
  <xcont> = XON threshold
  <bc> = current buffer byte count

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.


7.6  EXAMPLE SESSIONS

Table 7-6 and 7-7 show the typical command and responses for sending and 
receiving two pages respectively.

              Table 7-6 Send two pages, 1-D data, no errors
|----------------------------------------------------------------------|
| DTE COMMAND | DCE RESPONSE | LOCAL DTE ACTION |REMOTE STATION ACTION |
|-------------|--------------|------------------|----------------------|
| AT+FCLASS=2 | OK           | Set Class 2      |                      |
|-------------|--------------|------------------|----------------------|
| AT+FLID=    |              |                  |                      |
| <local id>  | OK           | Set local ID     |                      |
|-------------|--------------|------------------|----------------------|
| AT<dial str>|              | off hook, dial   | answer               |
|             |              | send CNG         | send [CED],          |
|             | +FCON        | detect flags     | v.21 flags           |
|             | +FDIS:<csi>  | get CSI          | CSI                  |
|             | +FDIS:<codes>| get DIS          | DIS                  |
|             | OK           |                  |                      |
|-------------|--------------|------------------|----------------------|
| AT+FDT      |              | send TSI         | get TSI              |
|             |              | send DCS         | get DCS              |
|             |              | send TCF         | get TCF              |
|             | +FDCS:<codes>| get CFR          | send CFR             |
|             | CONNECT      | send carrier     | receive carrier      |
|             | <XON>        |                  |                      |
| <1st page>  |              | send page data   | receive page data    |
| <DLE><ETX>  | OK           |                  |                      |
|-------------|--------------|------------------|----------------------|
| AT+FET=0    |              | send RTC         | get RTC              |
|             |              | get MPS          | send MPS             |
|             | +FPTS:1      | get MCF          | send MCF             |
|             | OK           |                  |                      |
|-------------|--------------|------------------|----------------------|
| AT+FDT      | CONNECT      | send carrier     | receive carrier      |
|             | <XON>        |                  |                      |
| <2nd page>  |              | send page data   | receive page data    |
| <DLE><ETX>  | OK           |                  |                      |
|-------------|--------------|------------------|----------------------|
| AT+FET=2    |              | send RTC         | get RTC              |
|             |              | send EOP         | get EOP              |
|             | +FPTS:1      | get MCF          | send MCF             |
|             | +FHNG:0      | send DCN         | get DCN              |
|             | OK           | hangup           | hangup               |
|-------------|--------------|------------------|----------------------|


              Table 7-7 Receive two pages, 1-D data, no errors
|----------------------------------------------------------------------|
| DTE COMMAND | DCE RESPONSE | LOCAL DTE ACTION |REMOTE STATION ACTION |
|-------------|--------------|------------------|----------------------|
| AT+FCR=1    | OK           | Enable reception |                      |
|-------------|--------------|------------------|----------------------|
| AT+FLID=    |              |                  |                      |
| <local id>  | OK           | Set local ID     |                      |
|-------------|--------------|------------------|----------------------|
|             | RING    <-   | detect ring  <-  | Dials[, send CNG]    |
|-------------|--------------|------------------|----------------------|
| ATA         |              | off hook         |                      |
|             |              | send CED         | get CED              |
|             |              | send CSI         | get CSI              |
|             |              | send DIS         | get DIS              |
|             | +FCON        | detect flags     | send v.21 flags      |
|             |[+FTSI:"<tsi>"] [get TSI]        | [send TSI]           |
|             | +FDCS:<codes>| get DCS          | send DCS             |
|             | OK           | begin TCF receive| start TCF            |
|-------------|--------------|------------------|----------------------|
| AT+FDR      |              | accept TCF       | finish TCF           |
|             | +FCFR        | send CFR         | get CFR              |
|             |[+FDCS:<codes>]                  |                      |
|             | CONNECT      | get page carrier | send page carrier    |
| <DC2>       |              | get page data    | send page data       |
|             |<page data stream>               |                      |
|             | <DLE><ETX> <-| detect RTC   <-  | send RTC             |
|             | +FPTS:1,<lc> |                  | drop carrier         |
|             | +FET:0    <- | get MPS       <- | send MPS             |
|             | OK           |                  |                      |
|-------------|--------------|------------------|----------------------|
| AT+FDR      |              | send MCF         | get MCF              |
|             | CONNECT      | get page carrier | send page carrier    |
| <DC2>       |              | get page data    | send page data       |
|             |<page data stream>               |                      |
|             | <DLE><ETX> <-| detect RTC   <-  | send RTC             |
|             | +FPTS:1,<lc> |                  | drop carrier         |
|             | +FET:2    <- | get EOP       <- | send EOP             |
|             | OK           |                  |                      |
|-------------|--------------|------------------|----------------------|
| AT+FDR      |              | send MCF         | get MCF              |
|             | +FHNG:0   <- | get DCN       <- | send DCN             |
|             | OK           | hangup           | hangup               |
|-------------|--------------|------------------|----------------------|