User's Manual

Chapter 7: Configuration
Configuring radio parameters
Page 7-132
Contention Slots
(a.k.a. Control Slots)
This field indicates the number of (reserved) Contention slots configured
by the operator. The SM uses reserved Contention slots and unused data
slots for bandwidth requests. See Contention slots on page7-168.
Broadcast Repeat
Count
The default is 2 repeats (in addition to the original broadcast packet, for
a total of 3 packets sent for every one needed), and is settable to 1 or 0
repeats (2 or 1 packets for every broadcast).
ARQ (Automatic Repeat reQuest) is not present in downlink broadcast
packets, since it can cause unnecessary uplink traffic from every SM for
each broadcast packet. For successful transport without ARQ, the AP
repeats downlink broadcast packets. The SMs filter out all repeated
broadcast packets and, thus, do not transport further.
The default of 2 repeats is optimum for typical uses of the network as an
internet access system. In applications with heavy download broadcast
such as video distribution, overall throughput is significantly improved
by setting the repeat count to 1 or 0. This avoids flooding the downlink
with repeat broadcast packets.
Transmitter Output
Power
This value represents the combined power of the AP’s two transmitters.
Nations and regions may regulate transmitter output power. For
example
 900 MHz, 5.4 GHz and 5.8 GHz modules are available as
connectorized radios, which require the operator to adjust power to
ensure regulatory compliance.
The professional installer of the equipment has the responsibility to
 maintain awareness of applicable regulations.
 calculate the permissible transmitter output power for the module.
 confirm that the initial power setting is compliant with national or
regional regulations.
 confirm that the power setting is compliant following any reset of
the module to factory defaults.
External Gain
This value needs to correspond to the published gain of the antenna
used to ensure the radio will meet regulatory requirements.
SM Receive Target
Level
See Table 130 PMP 450m AP Radio attributes - 5 GHz on page 7-125
Multicast VC Data
Rate
This pull down menu of the Multicast Data Control screen helps in
configuring multicast packets to be transmitted over a dedicated channel
at a configurable rate of 1X, 2X, 4X or 6X. The default value is “Disable”.
If set to the default value, all multicast packets are transmitted over the
Broadcast VC data path. This feature is available only for the PMP 450
Series and is not backward compatible with PMP 430 series of radios.