Lucent Technologies STGR-LIM-VD-24, Manual, Page: 42 / 102

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Bit rate, interleave, and delay considerations The AL-DMT subprofiles
3 - 1 2 363-217-032R9.9.0
Issue 2, Mrach 2006
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Bit rate, interleave, and delay considerations
Bit rate parameters
bit rate parameters specify minimum, maximum, and planned upstream and downstream
bit rates for a rate-adaptive connection.
Attainable bit rates
Bit rates depend on the physical interface (the line to which the central office equipment
(COE) and customer premises equipment (CPE) are connected) and the ADSL interleaved
or fast channel.
Fast-path bit rate settings
The bit rate parameter settings control the use of the fast channel for both upstream and
downstream traffic. In the current software version, both upstream and downstream traffic
must use the same channel.
Interleave-path bit rate settings
The bit rate parameter settings control the use of the interleave path channel for both
upstream and downstream traffic.
Relationship to line latency setting
The
line-latency-up
setting in the
line-config
subprofile determines which
channel is used in each direction. For more information, see “Parameter overview”
(p. 3-4) .
Interleave vs. delay
Data interleaving increases the ability of the system to tolerate noise on the line. However,
it increases the latency (delay) of the data traffic. When using the interleave channel,
determine the maximum amount of latency by considering the type of traffic sent on the
line. If traffic delay tolerance is high, then set the interleave settings at a high value.