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B. Signal format
1.
Preamble: a signal added before each signal when CI, CM and JM signals are sent.
Format: 1111111111 +0000000001 (for CI)
2.
Common format among each signal CI, CM and JM
Start Bit (=0) is put at the top and Stop Bit (=1) is put at the end of each octet.
Head octet
Expansion octet
(1) :Category tag (tags which represent information types)
Bit assignment
b0
b1
b2
1
0
0
1
0
1
0
1
0
1
0
1
0
1
1
(2) :Option bit (Differs depending on category tags. See the next item, bit definition.)
(3) :Additional option bit (Differs depending on category tags. See the next item, bit definition.)
7-18
+0000001111 (for CM and JM)
Start bit
b0
b1
0
4 bits
(1)
Start bit
b0
b1
0
3 bits
(3)
Meaning (information type)
b3
0
...
Call Func
0
...
Modulation Mode
1
...
Protocols
1
...
GSTN access
0
...
PCM modem ability
FK-502/Network Fax Service Manual Ver.3.0
b2
b3
b4
b5
b6
0
3 bits
(2)
b2
b3
b4
b5
b6
0
1
0
2 bits
Top of CM, JM / CI
CM / M
CM / M
CM / M
CM / JM
Stop bit
b7
1
Stop bit
b7
1
l
Included signa
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