Manual Part 2

Wireless Array
362 Configuring the Wireless Array
2. Roaming RSSI Threshold: If an Array is deployed on a mobile site (on a
train, for example), you can use WDS to implement a wireless backhaul
that will roam between Arrays at fixed locations. When another
candidate Array for WDS host target is found, the client link will roam to
the new Array if its RSSI is stronger than the RSSI of the current host
connection by at least the Roaming RSSI Threshold. The default is 6 dB.
3. Roaming RSSI Averaging Weight: This weight changes how much the
latest RSSI reading influences the cumulative weighted RSSI value
utilized in checking the threshold (above) to make a roaming decision.
The higher the weight, the lower the influence of a new RSSI reading.
This is not exactly a percentage, but a factor in the formula for computing
the current RSSI value based on new readings:
StoredRSSI = (StoredRSSI * RoamingAvgWeight
+ NewRSSIReading * (100 - RoamingAvgWeight)) / 100
This prevents erroneous or out-of-line RSSI readings from causing the
WDS link to jump to a new Array. Such readings can result from
temporary obstructions, external interference, etc.
4. Click the Save button after you are finished making changes on this
page if you wish to make your changes permanent.
WDS Client Link IAP Setting:
5. Enable/Disable/Reset All Links: Click the appropriate button to:

In situations like the one in the next step, where WDS is used by an Array
mounted on a high speed train, STP can add significant delay (often on the
order of 30 to 60 seconds) while initially analyzing network topology. In
such a situation, it may be desirable to disable STP. See “Management
Control” on page 226.

Caution: If Spanning Tree Protocol (“Management Control” on page 226) is
disabled and a network connection is made on the WDS Client Array’s
Gigabit link that can reach the WDS Host Array, broadcast and multicast
packets will not be blocked. A broadcast storm may cause a network outage.