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2-2. Modulation Mode (3 octets)
(1st actet)
b
0
b
1
b
2
b
3
b
4
1
0
1
0
0
(2nd octet)
b
0
b
1
b
2
b
3
b
4
0
1
0
1 /
0
1 /
0
1 /
(3rd octet)
b
0
b
1
b
2
b
3
b
4
0
1
0
1 /
0
1 /
0
1 /
2-3. Protocol (1 octet)
Protocols (1 octet)
b
0
b
1
b
2
b
3
b
4
0
1
0
1
0
2-4. GSTN access (1 octet)
GSTN access (1 octet)
b
0
b
1
b
2
b
3
b
4
1
0
1
1
0
b
5
b
6
b
7
(Modulation Mode category tag, b4=0 is first octet)
0
1 /
Reserved
0
1 /
V34 full-duplex ability disabled / enabled
0
1 /
V34 half-duplex ability disabled / enabled
b
5
b
6
b
7
0
(b3, 4 and 5=0, 1, 0 means expanded oct.)
V32bis / V32 ability disabled / enabled
V22bis / V22 ability disabled / enabled
V17 ability disabled / enabled
0
1 /
V29 half-duplex ability disabled / enabled (used in T.30)
0
1 /
V27ter ability disabled / enabled
b
5
b
6
b
7
0
(b3, 4 and 5=0, 1, 0 means expanded oct.)
V26ter ability disabled / enabled
V26bis ability disabled / enabled
V23 full-duplex ability disabled / enabled
0
1 /
V23 half-duplex ability disabled / enabled
0
1 /
V21 ability disabled / enabled
b
5
b
6
b
7
(Protocols category tag)
1
0
0
V42 LAPM protocol
1
1
1
Protocol represented by expanding octet
(Other than the above = Reserved)
b
5
b
6
b
7
(GSTN access category tag)
0
1 /
Celluler connection in the calling side
0
1 /
Celluler connection in the called side
0
Reserved
7-13
Meaning
I
e t
I
e t
Meaning
Meaning
I
e t
Meaning
Meaning
m
N
. o
1
2
m
N
. o
3
4
5
6
7
m
N
. o
8
9
1
0
1
1
1
2
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