ProSoft Technology RLX2-IHNF-WC - Manual (Page 83)

RLX2 Industrial Hotspot Series
ProSoft Technology, Inc. Page 83 of 212
June 15, 2015
Field
Description
Parent Branch Length RLX2 radio will choose its parent strictly by the number of repeaters between
it and the Master radio. If a Branch Length of 1 is chosen, the RLX2 radio will
link only to the Master radio. If a Branch Length of 2 is chosen, the RLX2 radio
will link only to another RLX2 radio that is linked to the Master radio, and so
on. If multiple candidates are available at a particular hop count, the RLX2
chooses the Parent that has the smallest cost.
Preferred Parent RLX2 radio will select its parent from a list of possible parents specified by the
user. When this option is selected, a list of up to eight MAC Address entry
fields become visible. The user enters one or more MAC Addresses of the
Radios that the RLX2 must choose from.

Best in List
When Best in List is selected the radio will select its parent using the
"Automatic Parent Selection" algorithm, but it will limit the selection to
the list of radios in the list. Therefore, the radio in the list with the
lowest cost according to the algorithm will be chosen as its parent.
 Follow List Priority
When Follow List Priority is chosen the radio will select its parent from
the list giving preference to the 1st entry followed by the 2nd entry and
so on.
Parent Selection Parameters
Signal Strength Threshold When the signal from a parent reaches a high enough value, a stronger signal
will not improve the quality of the link any further. For signals that are above
that threshold, only fewer hops from the Master give preference. The
threshold can be adjusted here. Another way to consider this in Fast Roam
applications, is that the RLX2 will not Roam to a new Parent at the same hop
count level until its current Parent’s RSSI goes below (weaker) that this value.
Parent Margin In Fast Roam applications where the RLX2 is on a mobile platform, or there is
a lot of movement in the environment causing RSSI levels to fluctuate, it is
desirable to have the RLX2 stick to its current Parent unless a better Parent’s
RSSI is stronger than this value. This margin value is added to the current
Parent’s RSSI prior to calculating its cost. It is desirable to ‘roam’ to a new
Parent prior to losing the connection with the current Parent which results in
data loss.
A value too small in this parameter can lead to an RLX2 ping-ponging back
and forth between two Parents as the RSSI levels fluctuate. A value too large
could result in a roam not occurring up to the point where the unit moves out
of range, even though a candidate exists that is actually better than the
current Parent.
The default value is 5 dB. Larger values (10-15 dB) should be used to prevent
false roams from occurring due to temporary RSSI inversions between the
current Parent and another candidate, with the caveat of course, that a roam
point exists where the RSSI difference between the current Parent and the
new Parent is greater than this margin.