DLCQLLC Device Manager Functions

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DLCQLLC is split between a physical adapter with its associated device handler and a data link control component.

The DLC component is responsible for the following QLLC functions:

  • Creation of address and control for transmit frames
  • Service of control for receive frames
  • Repoll and inactivity time outs
  • Frame-reject generation
  • Facility negotiation

The data link control and device handler components are jointly responsible for:

  • Notification of exceptional conditions to higher levels
  • Reliability/availability/serviceability (RAS) counters, error logs, and link traces

The device handler and adapter are jointly responsible for:

  • Packetization of I-frames
  • Packet sequencing
  • Link access protocol balance (LAPB) procedures
  • Physical-line attachment protocols