3Com MSR 50 Series Configuration Manual page 1655

Type Queue No.
PQ 4
CQ 16
WFQ Configurable
Congestion Management Overview
Advantages
Provide service of absolute
preference to data of
different applications, and
capable of ensuring the low
delay for real-time
applications (VoIP). Provide
absolute preference to the
packets of preferential
business on their
bandwidth-occupying.
Capable of assigning the
■
bandwidth-occupying
proportion according to
packets with different
applications
If packets of certain
■
classes do not exist, it
can increase the
bandwidth for existing
packets.
Easily configured
■
Capable of ensuring the
■
bandwidth-occupying
for data sources (e.g.
TCP packets sending)
used for interactive
purpose
Capable of reducing
■
jitter
Capable of reducing the
■
delay for interactive
application with small
data
Capable of assigning
■
different bandwidth for
traffics with different
priorities
When the amount of
■
the traffics decreased, it
can automatically
increase the bandwidth
for existing traffics.
Disadvantages
Need to be configured; low
■
processing speed
If there are no restrictions on
■
bandwidth-occupying of
packets with high preference,
the packets with low
preference won't obtain the
required bandwidth.
Need to be configured; low
processing speed
The processing speed is faster
than that of FIFO but slower than
that of PQ and CQ.
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