User manual

Chapter 2 - Managing a Single Device/Cell Service Parameters Page
AlvariCRAFT Device Manager 134 User Manual
2.20.4 The Service Parameters Page WLP (Wireless
Link Prioritization) Tab (AU and BU-B100
Only)
To better support delay-sensitive and other high-priority traffic, a set of Wireless
Link Prioritization parameters enables configuring parameters that affect the
processes of gaining access to the wireless media and of transmitting high/low
priority packets.
Under regular conditions, AIFS is configured to two time slots. To support
prioritization in the wireless link, we can configure a higher AIFS for low priority
traffic (AIFS of two time slots will always be used for high priority traffic as well as
AU's transmissions of broadcasts/multicasts and beacons). This will give
advantage to units that need to transmit high priority traffic (depending also on
the configured values for the Contention Window parameters).
Other parameters related to transmission to the wireless media that can be
configured separately for high/low priority packets are the Number of Hardware
Retries and Burst Interval.
Typically, a lower value of Number of Hardware Retries should be configured for
traffic such as VoIP, which on the one hand is sensitive to delays and on the other
hand is less sensitive to missing packets than data traffic.
Max Number of Voice
Calls
The Max Number of Voice Calls parameter sets the maximum
number of active calls that may be supported by the AU.
The range is between 0 and 255.
DRAP TTL (sec) The DRAP TTL parameter sets the time between two consecutive
Allocation Requests from the Gateways. The Allocation requests are
used to identify the existence of an active Gateway. In Voice
Gateways they also include information about the current number of
voice calls and requests for new calls.
The range is between 1 and 255 (seconds).
Total Number of Active
Voice Calls
A read-only display of the current total number of active voice calls in
the AU.
NOTE
The Wireless Link Prioritization feature is a licensed feature and is available in BU-B100 units. It is
also available in AUs with the suitable Feature License (not applicable for AUS).