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I-D ACTION:draft-nunes-pppext-mcp-00.txt



A New Internet-Draft is available from the on-line Internet-Drafts directories.


	Title		: Multi-Class PPP with Channel Preemption and Dynamic 
                          Fragmentation
	Author(s)	: M. Nunes
	Filename	: draft-nunes-pppext-mcp-00.txt
	Pages		: 7
	Date		: 17-Jun-02
	
This document defines the encapsulation and mechanisms that allows PPP 
packets to be transported over low-bitrate links such as modem lines, 
ISDN B-channels, and sub-T1 links with guarantee of quality of service 
for time sensitive services. A mechanism of channel preemption is 
defined, allowing the immediate occupation of the channel with the most 
priority packet, resuming the transmission of the lower priority frame 
without need to retransmit the octets already sent. This mechanism 
allows a dynamic packet fragmentation, guaranteeing simultaneously a 
low transmission delay for the services more sensitive to transmission 
delays and an efficient channel occupation. It is a recursive 
mechanism, which means that the packet that made the channel preemption 
can itself be preempted by another higher priority packet, and this 
process can be repeated whenever a higher priority packet requests 
transmission. The proposed mechanism is compatible with existing 
hardware and drivers for asynchronous and synchronous HDLC controllers.

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