Nortel Networks NB5PLUS4/W User Manual

One Expedited Forwarding (EF) Queue: High Priority queue with non-preemptible 

service. The EF queue is always scheduled first prior to the medium and low priority 

queues and runs to completion

Two Queues (Medium and Low Priority) with Weighted Round Robin service. Based 

on the associated weights, packets on these queues share the remaining link 

bandwidth (after the EF service). The low priority queue corresponds to Best Effort 

service. Looking forward, the medium priority queue will play the role of Assured 

Forwarding Queue.

Configuration:

a.) The Medium, and Low Priority Queue weights will be selectable via the Web UI. 

User weights for these two queues are entered as a percentage in increments of 

10%. The sum of the 2 weights must be equal to 100 percent.

En-queuing Policy

Inter-queue isolation to make greed work on the Residential Gateway: the transmit 

interface buffer (a common pool for all queues) can be monopolized by a greedy 

flow on the low priority queue thus preventing en-queuing high priority traffic. To 

prevent such conditions the en-queuing process is using a simple configurable al-

location of per-queue lengths, adding up to the total queue length.

Configuration:

The Expedited Forwarding queue (fast service queue) length will be configurable via 

the config.xml file. This parameter will not be configurable via the Web UI.  Please 

call NetComm Support and request to speak with an engineer should you require 

this XML file to edit.