Table 5: Typical "External Antenna Gain" Values - Motorola 5440AP - Canopy 5.4 GHz AP User Manual Supplement

Canopy 400 Series OFDM AP and SM
Similarly for the AP, enter the antenna gain in the External Antenna Gain field. The standard
antenna sold with the AP has a 17 dBi gain.
Typical External Antenna Gain values are shown in Table 5.
For this installation
Canopy 400 Series AP with standard
connectorized 17 dBi antenna
Canopy 400 Series AP with other antenna
Canopy 400 Series SM
The value entered in the External Gain field does not affect the transmitter power. The radio
transmits at the level entered in the Transmitter Output Power. The module only uses the values
entered in the External Antenna Gain field to adjust DFS sensitivity, not to change transmitter
power.
4.5 OTHER CONFIGURABLE PARAMETERS
Other parameters are configured the same as they are in standard Canopy. These include, High
Priority/DiffServ, NAT, DHCP, VLAN, MIR, and CIR. MIR and CIR work the same as in standard
Canopy, but the operator may (or may not) want to take advantage of the higher MIR possible to
provide greater bandwidth to a given SM.
4.6 PARAMETERS THAT ARE NOT CONFIGURABLE
Canopy 400 Series radios use FEC (Forward Error Correction) to extend the range of the
modules. They use Reed-Solomon error correction optimized at 3/4 coding. The coding rate is not
settable by the operator.
OFDM technology uses a cyclic prefix, where a portion of the end of a symbol (slot) is repeated at
the beginning of the symbol (slot) to allow multipathing to settle before receiving the desired data.
The initial release of Canopy 400 Series radios use a cyclic prefix of 1/4 that is not configurable
by the user. This means that for every 4 bits of throughput data transmitted, an additional bit is
used. Future releases may offer lower cyclic prefixes to allow the operator to trade off between
multipathing resistance and throughput.
Version 1, April 2008

Table 5: Typical "External Antenna Gain" Values

Enter this value in the
"External Antenna Gain" field
17
The dBi of the antenna
17
User Guide
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