BinTec X4000, Руководство пользователя

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X4000 User’s Guide 201
Settings Specific to WAN Partners
8
8.2.3 Bandwidth on Demand (BoD)
This function permits dynamic bundling of leased lines with dialup lines to cope
with large amounts of data. You have the following options:
■
BOD for leased lines, i.e. dynamic connection of one or more dialup
connection(s) to the existing leased line, if required.
■
BOD for dialup connections, i.e. dynamic connection of one or more dialup
connection(s) to the existing dialup connection, if required.
■
Backup for leased lines, i.e. establishing a dialup connection when the
leased line to the partner fails. BOD also acts if the leased line fails (i.e.
other dialup connections can be switched in); if more than 1 additional
channel was allowed in the configuration (Maximum Number of Dialup
Channels >
1).
Switching B-channels
in and out
A B-channel is switched in if the current data throughput of the relevant interface
to the connection partner is 90 % or more of the maximum permissible
throughput for at least 5 seconds.
The current throughput is not used as a basis for switching out a B-channel
already connected. This is based on the calculated (i.e. fictitious) throughput of
the channel group after switching out one B-channel. A B-channel is switched
out if the calculated value stays below 80 % of the maximum permissible
throughput of the remaining channels for 10 seconds.
Static or dynamic short hold may also cause an additional B-channel to be
switched out. If static short hold has been configured, this always has the
highest priority. If dynamic short hold has been configured, the calculated value
mentioned above must also apply.
X4000 also supports the AO/DI (Always On/Dynamic ISDN) function for using
the ISDN D-channel for data transmission (see chapter 8.2.4, page 206 ).
Authentication PPP authentication is not required from the connection partner for establishing
a leased line. Authentication is, however, necessary for any dialup connections
switched in.