User manual

AP User Manual January 2004
Software Release 4.1
Input Rate
128 Kbps
Sustained Rate
128 Kbps
Burst Allocation
128 Kb
Effective Rate
128 Kbps with no Burst
Figure 6: Burst Allocation vs. Sustained Rate, Example 2
Input Rate
128 Kbps
Sustained Rate
128 Kbps
Burst Allocation
56 Kb
Effective Rate
56 Kbps with no Burst
Figure 7: Burst Allocation vs. Sustained Rate, Example 3
Input Rate
128 Kbps
Sustained Rate
128 Kbps
Burst Allocation
0 Kb
Effective Rate
0 Kbps
Figure 8: Burst Allocation vs. Sustained Rate, Example 4
4.3 HIGH-PRIORITY BANDWIDTH
To support low-latency traffic such as VoIP (Voice over IP), the Canopy system implements a high-
priority channel. This channel does not affect the inherent latencies in the Canopy system but
allows high-priority traffic to be immediately served. The high-priority pipe separates low-latency
trafiic from traffic that is latency tolerant, such as standard web traffic and file downloads.
The Canopy system separates this traffic by recognizing the IPv4 Type of Service Low Latency bit
(Bit 3). Bit 3 is set by a device outside the Canopy system. If this bit is set, the system sends the
packet on the high-priority channel and services this channel before any normal traffic.
NOTE: To enable the high-priority channel, the operator must configure all high-priority
parameters.
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