[MSDN Library June 1998] 5.5.4 ISDN and Switched 56K Framing (86.8055555555556%)
MSDN Library Visual Studio 6.0 > DDK Documentation > Microsoft Windows NT 4.0 DDK > Network Drivers > Design Guide > Part 2: Miniport NIC Drivers > Chapter 5 WAN Miniport NIC Drivers > 5.5 WAN Packet Framing