Motorola PTP 400 Series User Manual page 101

ARQ State: Automatic Repeat reQuest (ARQ) is a mechanism where packets lost due to
transmission errors over the wireless link are retransmitted rapidly. The retransmission helps
to prevent TCP congestion mechanisms from inadvertently interpreting intermittent pack loss
as network congestion. ARQ must be enabled on both ends of the point-to-point link for it to
function.
Max Transmit Power: This attribute controls the maximum transmit power the unit is
permitted to use when installing and executing the wireless link. The maximum setting for a
particular region or country is controlled by the License Key.
Ranging Mode: During installation the wireless units perform automatic ranging. The ranging
mode allows the installer to control the behavior of the systems automatic ranging algorithms.
The default value is 0 to 40 km
greater than 40 km (25 miles) then the ranging mode attribute MUST be configured to '0 to
100km' (0 to 62 miles) or '0 to 200km' (0 to 134 miles) mode depending on the range of the
link. Likewise selecting the 0 to 5 km (0 to 3 miles) mode for links under 5 km (3 miles) will
give you optimal performance.
Target Range: Installers that know the range between the two wireless units to within ± 1 km
(± 0.62 mile) can use the target range mode. The main advantage of the target range mode is
that it reduces the time taken by the units to range. To use the target range mode the installer
MUST select Target Range as the ranging mode and enter the approximate range in km in
the Target range data entry field at both ends of the link.
Spectrum Management Control: Is used to configure the PTP 400 Series Bridge Spectrum
Management features, see section 8.3.8 for more details. I-DFS is the abbreviation for
intelligent Dynamic Frequency Selection. This feature continually monitors the spectrum
looking for a the channel with the lowest level of on channel and co-channel interference.
Fixed frequency mode allows the installer to fix the transmit and receive frequencies on the
units. The frequencies may be configured symmetrically or asymmetrically.
Lower Center Frequency: The software for the PTP 400 Series Bridge allows a user to
optionally adjust the channel center frequencies. See section 5 " General Considerations" for
further information. This field is only available in i-DFS mode on 5.4 GHz and 5.8 GHz
variants.
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If preferred 400 Series Bridge range functions can be configured to operate in miles, see the
Properties page in section 8.3.19.
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(0 to 25 miles). If the installer is required to install a link of
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