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Synchronous Data Link Control Overview
114053 Rev. A 1-9
Each frame begins with a one-byte flag that alerts the receiver to the frame’s
presence.
The address field is a one byte field that identifies the secondary link station that
communicates with the primary link station. In a poll, the Address field identifies
the station being polled. In a response, this field identifies the transmitting
secondary station.
The control field is one or two bytes long and identifies the function of the frame.
This field defines the frame format (supervisory, information, or unnumbered).
The optional information field is a variable-length field (the length must be a
multiple of eight bits).
A two-byte frame-checking field lets the receiving station check the received
frame for errors.
A one-byte flag ends the frame.
Using APPN Services with SDLC
You can configure any SDLC interface for APPN services. APPN nodes can
communicate with adjacent nodes using SDLC links over point-to-point and
multipoint configurations. For information on the APPN node types and how to
configure APPN, see Configuring APPN Services.
Using DLSw Services with SDLC
You can configure any SDLC interface for DLSw services. For information on
DLSw, see Configuring DLSw Services.
For More Information about SDLC
For more information about SDLC and IBM SNA, refer to the following IBM
publications:
IBM Synchronous Data Link Control: Concepts (GA27-3093)
IBM System Network Architecture: Technical Overview (GC30-30723)
IBM System Network Architecture: Concepts and Products (GC30-3072)
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