88:
The DNIC has three digits to identify the country (one to identify a zone and two to identify the country within the zone) and one to identify the PDN (allowing only ten in each country). The NTN identifies the exact network device (DTE,
100:
IPv4 addresses can be mapped to X.121 as described in RFC 1236. The 14.0.0.0/8 block used to be reserved for X.121 use but was returned to IANA in 2008 to stave off
42:
170:
160:
165:
101:
94:
90:
140:
50:
46:
8:
38:
97:(PSN) and is often provided as an NUA. There are no rules to the structure of the NTN.
34:
30:
175:
154:
113:
23:
120:
27:
33:used as part of call setup to establish a switched
152:
53:(PLP) after the packet type identifier (PTI).
69:), which consists of two fields: the 4 digit
45:(NUAs). It consists of a maximum of fourteen
153:
13:
14:
187:
71:data network identification code
171:ITU-T X Series Recommendations
133:
61:The address is made up of the
56:
1:
141:"Public Data Network Numbers"
126:
49:digits and is sent over the
7:
107:
77:) and the (up to) 10 digit
10:
192:
63:international data number
79:national terminal number
161:Network layer protocols
102:IPv4 address exhaustion
95:packet-switched network
91:data terminal equipment
41:(PDNs), connecting two
43:network user addresses
26:address format of the
166:ITU-T recommendations
51:Packet Layer Protocol
47:binary-coded decimal
39:public data networks
16:ITU-T recommendation
183:
145:
144:
137:
191:
190:
186:
185:
184:
182:
181:
180:
151:
150:
149:
148:
139:
138:
134:
129:
110:
59:
35:virtual circuit
17:
12:
11:
5:
189:
179:
178:
173:
168:
163:
147:
146:
131:
130:
128:
125:
124:
123:
117:
116:
109:
106:
58:
55:
31:protocol suite
15:
9:
6:
4:
3:
2:
188:
177:
174:
172:
169:
167:
164:
162:
159:
158:
156:
142:
136:
132:
122:
119:
118:
115:
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111:
105:
103:
98:
96:
92:
86:
84:
80:
76:
72:
68:
64:
54:
52:
48:
44:
40:
36:
32:
29:
25:
21:
135:
99:
87:
82:
78:
74:
70:
66:
62:
60:
19:
18:
57:Description
155:Categories
127:References
93:) in the
114:Videotex
108:See also
37:between
22:is the
24:ITU-T
20:X.121
176:X.25
121:X.75
75:DNIC
28:X.25
85:).
83:NTN
67:IDN
157::
104:.
143:.
81:(
73:(
65:(
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