Cisco Cisco IOS Software Release 12.2(15)B

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RFC1661- 6.5 Protocol-Field-Compression (PFC)

RFC 1661- 6.6 Address-and-Control-Field-Compression (ACFC)

RFC 1662 PPP in HDLC-like Framing 

Address and Control Field compression is only applicable to links that use PPP in HDLC-like framing 
as described by RFC 1662

See the following sections for configuration tasks for the ACFC and PFC Handling During PPP 
Negotiation feature. Each task in the list is identified as either required or optional.

 (optional)

 (optional)