Canon FAX L1000 Service Manual page 511

c-2) Variable Length Information Elements
The main information element is composed of an information element identifier (1 octet),
an length of contents of information element (1 octet), and an contents of information
element (the length of octet which is shown by the "length of contents of information
element").
......
For example, if an length of contents of information element value is "02," the contents of
information element is 2 octets.
The way in which the SETUP message and the main information elements in the clearing
message are displayed on the Dch dump list is shown below.
c-3) Main information elements in the SETUP message
•Bearer Capability (*8)
Number 1 octet : "04"
Number 3 octet : Information transfer capacity
"88": Unrestricted digital
"90": 3.1kHz audio
"80": Speech
•Channel Identification (*9)
Number 1 octet : "18"
Number 3 octet : Information channel selection
"80": No channel
"81": B1 channel
"82": B2 channel
"83": Any channel
•Calling Party Number (*10)
Number 1 octet : "6C"
From number 4 or number 5 octet on*: Number digit (IA5 character)
*: When the most significant bit of number 3 octet is "0," number digits will appear in
number 5 octet onwards. When the most significant bit of number 3 octet is "1,"
number digits will appear in number 4 octet onwards.
•Low Layer Compatibility (*12)
Number 1 octet : "7C"
Number 3 octet : Information transfer capability
"88": Unrestricted digital
Contents of Information element
Length of contents of information element
Information element identifier (a type of information
element)
5-153
FAX-L1000 Chapter 5: Appendix