Technical Reference for ZyXEL omni.net series
8-2
About V.110, V.120 and X.75 ISDN Protocols
ISDN Protocols
Description
V.110
V.110 is most popular in Japan.
V.120
V.120 is most commonly used in the U.S.A.
X.75
X.75 was originally designed for packet-switched signaling systems in public networks
to provide data transmission services. However, it is now also used as the link layer for
telematic services (as defined in T.90) in ISDN. These services include both ISDN
circuit-switched mode (DTE-DTE communication) and ISDN packet-switched mode
(DTE-DCE communication).
Table 43. Description of V.110, V.120 and X.75 ISDN Protocols
Answering V.110, V.120, and X.75 Calls
In most cases, there is no need to configure the ISDN mode to the protocol of an incoming call.
Your omni.net is able to determine the correct protocol to use by examining the data coming in
from the remote site if the device is set to auto-answer or once an answer command is issued.
To allow your ISDN TA to auto-answer the incoming call, you need to set [S0] to a value greater
than or equal to 1 (i.e. ATS0 1). If [S0] is not set (S0=0), the DCE will report "RING" to your
terminal, and also make an audible ring notification.
Placing V.110, V.120, and X.75 Outgoing Calls
The following tables describe the [ATB] commands used to specify the outgoing protocol.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
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