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Comment # 32 on bug 9427 from Guy Harris

(In reply to comment #30)
> Frame Relay *also* uses HDLC's framing, but doesn't use HDLC's header;
> instead, it uses headers that include an address field but *not* a control
> field.

Actually, checking Q.922, there *is* a control field in there, so the layer 2
protocol for Frame Relay (called LAPF, along the lines of its relatives LAPB
and LAPD) is Yet Another HDLC-Influenced Protocol.

See also

   
http://www.cisco.com/en/US/tech/tk713/tk237/technologies_tech_note09186a008014f8a7.shtml

   
http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1918.html

for some information on Frame Relay from Cisco.

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