Appendix 1. CCITT recommendations (numbers and brief descriptions)
(Note: ter and bis are terms with Latin roots meaning 3 and 2, respectively. Recommendations with these terms in the number have 3 or 2 data rates, the system normally starting up in the higher rate but falling back to the lower speed under noisy conditions).
| X 1 | International user classes of service- in public data networks. |
| X 2 | International user facilities in public data networks. |
| X 3 | Packet assembly /disassembly facility in a public data network. |
| X 4 | General structure of signals of International Alphabet No. 5 code for data transmission over public data networks. |
| X 20 | Interface between data terminal equipment and data circuit terminating equipment for start-stop ... |
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