Figure 3.5 Example of reservation
While for a two SHDSL channels system in case of a failure the substitution of channels is “trivial”,
in three and four SHDSL channels system different variants are possible. However, any system
using the reservation mode follows a strict logic in channel substitution. The next table illustrates
the logic of channel reservation with 2/3/4 SHDSL interfaces.
The table for four DSL channels is constructed based on the assumption that communication in
one channel is lost frequently, while communication in two channels occurs less frequently.
Usually a loss of communication occurs successively, i.e., the first channel fails and then the next
channel fails. The logic and rules for channel substitution are made to minimize the number of
channel switching (especially high-priority channels) to minimize the data losses.
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