asynchronous High-level Data Link Control (HDLC) protocol module
The asyhdlc module is part of the STREAMS protocol
stack used for PPP connections over asynchronous links.
A PPP HDLC packet lacks a CRC checksum
and uses a ``transparent code'' for data transmission.
asyhdlc performs the following
functions on PPP datagrams:
for additional information about the PPP implementation.
generates (on writing) and validates (on reading) the CRC checksum
performs byte stuffing to achieve data transparency by
encoding (on writing) and decoding (on reading) packet data
generates and strips the framing patterns that delimit the start and end
adds (on writing) and removes (on reading) constant address and
control bytes if address and control compression is not negotiated
while reading, discards short or long packets and packets with bad checksums,
and notifies PPP to allow recovery of compressed
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SCO OpenServer Release 6.0.0 - 01 June 2005