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Introduction
19
To set up a Bandwidth on Demand installation, you would first connect the second link of the P2600 router to a public
circuit-switched network using the appropriate interface device. You would use high-speed modems with telephone lines,
terminal adapters with an ISDN network, or digital modems with switched digital services.
This second link is then assigned as the secondary connection by placing the link number in the Edit Remote Site menu
“Secondary” option. The connection is set up for bandwidth on demand by setting the “Connection “ option in the Edit
Remote Site menu to “threshold”.
Now you must choose the throughput level that will be required for activating the stand-by link. The throughput level is
measured in percentage of use of the primary link. This percentage level is defined by the Up Threshold parameter in the
Activation - Threshold Menu and may be set to any value from 50% to 100%.
A timer must be defined to determine the length of time to wait before bringing up the stand-by link. The Up Stability Timer
parameter in the Activation - Threshold Menu is used to define how long in minutes (from 1 to 60) the main link must exceed
the threshold before the stand-by link is started.
Once the activation-throughput threshold has been determined and set, you must decide what the throughput threshold will
have to be to drop the second link and operate on the main link only.
The Down Threshold level is set in the Activation - Threshold Menu and defaults to 10% lower than the Up Threshold level.
Remember that the down threshold looks at the total throughput (both links together) to determine if the second link will be
brought down. The Down Threshold is defined as the percentage of the main links bandwidth the current total throughput
represents. When the total throughput drops below the Down Threshold, the second link will be dropped.
A timer must also be defined to determine the length of time to wait before dropping the stand-by link. The Down Stability
Timer parameter in the Activation - Threshold Menu is used to define how long in minutes (from 1 to 60) the combined links’
throughput must remain below the down threshold level before the stand-by link is stopped.
Time of Day Connect Application
In addition to the Bandwidth on Demand feature, the P2600 router has the ability to establish link connections based
on a specific time-of-day schedule. Either one or two links may be controlled using the Time of Day feature. The
Time of Day feature may also be used in conjunction with the Bandwidth on Demand feature. It may be used in
both Multipoint and Point-to-Point configurations.
Point-to-Point
One example of a Point-to-Point configuration would consist of a head office and a remote office. Cost comparisons
might reveal that it is less expensive to use a dial-up line during business hours only instead of a permanent leased
line.
One P2600 router will be installed at each office, and the link from each bridge/router will be connected to a dial
modem. Set the link operation of the bridge/router at the head office to Conditional, and then enter a time schedule
by using the Time Schedule option of the Activation Conditions Menu. The modem connected to the head-office
bridge/router will have an autodial number of the modem at the remote office. With the time schedule set to have
the link active from 8 am to 6 pm each day of the week, the P2600 router will establish the link and keep it active
during those hours only. The time selection may be made in half-hour (30-minute) increments.
Another example of a Point-to-Point configuration would consist of two P2600 routers connected together with one
link pair, with the other link pair being used for Time of Day connection. This extra link could be needed during
specific times for predicted traffic increases.