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X.25 TYPE NUMBERS
CCITT defines the high order two bits of the first octet of call user
data as follows:
00 - Used for other CCITT recomendations (such as X.29)
01 - Reserved for use by "national" administrative
authorities
10 - Reserved for use by international administrative authoorities
11 - Reserved for arbitrary use between consenting DTEs
Call User Data (hex) Protocol Reference
------------------- -------- ---------
01 PAD [GS2]
C5 Blacker front-end descr dev [AGM]
CC IP [RFC877,AGM]*
CD ISO-IP [AGM]
CF PPP [RFC1598]
DD Network Monitoring [AGM]
*NOTE: ISO SC6/WG2 approved assignment in ISO 9577 (January 1990).
REFERENCES
[RFC877] Korb, J., "A Standard for the Transmission of IP Datagrams
Over Public Data Networks", RFC 877, Purdue University,
September 1983.
[RFC1598] Simpson, W., "PPPin X.25", RFC 1598, Daydreamer, March 1994.
PEOPLE
[AGM] Andy Malis <malis_a@timeplex.com>
[GS2] Greg Satz <satz@CISCO.COM>
(last updated May 01 2001)
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