Information Processing Systems - Data Communication - High-Level Data Link Control Procedures - General Purpose XID Frame Information Field Content and Format
DATA PROCESSING, OPEN SYSTEMS INTERCONNECTION, DATA LINK LAYER (OSI), HIGH-LEVEL DATA LINK CONTROL, DATA TRANSMISSION CONTROL PROCEDURES, FRAMES (DATA TRANSMISSION)
被代替标准
CAN/CSA-ISO/IEC-8885-95
适用范围
This National Standard of Canada is equivalent to International Standard ISo
8885-1987. 1. Scope and field of application The principal use of the XID frame is to exchange data link information between
two or more HDLC stations. For the purpose of this International Standard, data
link information shall include any and all essential operational
characteristics such as identification authentication and/or selection of
optional functions and facilities concerning each station. It International
Standard defines a single-exchange negotiation procedure for establishing
operational characteristics when either one or more stations are capable of
providing multiple selections. This International Standard provides a means for interchanging the necessary
information to establish, at a minimum, a data link connection between two
correspondents wishing to communicate. It describes the general purpose XId
frame information field content and format. This International Standard does not limit or restrict the use of the XID frame
information field from defining other standard formats for use in specific
applications. The following are examples of potential uses of the XID command/response frame
interchange: - Identification of the calling and called stations when using circuit
switched networks (including switched network backup applications). - Identification of stations operating on non-switched networks
requiring identification at start-up. - The XID command frame with an individual, group or all-station
address may be used to solicit XID response frame(s) from other
station(s) on the data link, prior to or following data link
establishment. - Convey higher layer information that may be required prior to data
link establishment. - Transmission of an XIX response frame at any respond opportunity to
request an XID exchange to modify some of the operational parameters
(for examples, window size) following data link establishment.