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Chapter 3 – Fax Class 2 Commands
Multi-Tech Systems, Inc. SocketModem MT5634SMIxx Reference Guide (S000263C) 87
Phase C Data Format Parameters
Data Bit Order: +FBO and +FBOR
Class 2.0/2.1 +FBO
Write syntax: +FBO=<value>
Valid values: 0, 1
Default value: 0
This parameter controls the mapping between PSTN facsimile data and the host-
modem link. There are two choices:
+FBO=0 Direct bit order for both Phase C data. The first bit transferred of each
byte on the host-modem link is the first bit transferred on the PSTN data
carrier.
+FBO=1 Reversed bit order for Phase C data. The last bit transferred of each byte
is the first bit transferred on the PSTN data carrier.
The effect of this parameter is illustrated for the EOL pattern in the Phase C Data
Format Parameters section in this chapter.
Class 2 +FBOR
Write syntax: +FBOR =<value>
Valid values: 0, 1
Default value: 0
This parameter controls the mapping between PSTN facsimile data and the host-
modem link. There are two choices:
+FBOR=0 Direct bit order for both Phase C data. The first bit transferred of each
byte on the host-modem link is the first bit transferred on the PSTN
data carrier. Applies to FAX sending for all Multi-Tech modems.
+FBOR=1 Reversed bit order for Phase C data. The last bit transferred of each
byte is the first bit transferred on the PSTN data carrier. Applies to
FAX sending for all Multi-Tech modems.
The effect of this parameter is illustrated for the EOL pattern in the Phase C Data
Format Parameters section in this chapter.
Phase C Received EOL Alignment: +FEA and +FREL
Class 2.0/2.1 +FEA
Write syntax: +FEA=<value>
Valid values: 0, 1
Default value: 0
+FEA=0 EOL patterns are bit-aligned as received.
+FEA=1 The last received bits of EOL patterns are byte-aligned by the
modem, with necessary zero fill bits inserted. There are two 2-byte
binary EOL patterns, in which xxxx represents previous data bits, zero
bits, or other leading data:
+FBO=0: 0000xxxx 10000000
+FBO=1: xxxx0000 00000001
Class 2 +FREL
Write syntax: +FREL=<value>
Valid values: 0, 1
Default value: 0
+FREL=0 EOL patterns are bit-aligned as received.
+FREL=1 The last received bits of EOL patterns are byte-aligned by the
modem, with necessary zero fill bits inserted. There are two 2-byte
binary EOL patterns, in which xxxx represents previous data bits, zero
bits, or other leading data:
+FBOR=1: 0000xxxx 10000000
+FBOR=1: xxxx0000 00000001