Framed Protocol Help Page 

  This Attribute indicates the framing to be used for framed access.
  It MAY be used in both Access-Request and Access-Accept packets.

  Possible values are:
1 PPP
2 SLIP
3 AppleTalk Remote Access Protocol (ARAP)
4 Gandalf proprietary SingleLink/Multilink protocol
5 Xylogics proprietary IPX/SLIP
6 X.75 Synchronous
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