This module provides framing for TOS_Msg's using PPP-HDLC-like framing (see RFC 1662). When sending, a TOS_Msg is encapsulated in an HLDC frame. Receiving is similar EXCEPT that the component expects a special token byte be received before the data payload. The purpose of the token is to feed back an acknowledgement to the sender which serves as a crude form of flow-control. This module is intended for use with the Packetizer class found in tools/java/net/packet/Packetizer.java.