User's Manual

Cyclone 5700-360.OFDM 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.

4.8 CYCLIC PREFIX (CONFIGURABLE ONLY ON CYCLONE OFDM AP/SM)

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 multi-pathing to settle before receiving the desired data. A 1/4

cyclic prefix means that for every 4 bits of throughput data transmitted, an additional bit is used, A 1/8

cyclic prefix means that for every 8 bit of throughput data transmitted, an additional bit is used.

Cyclone OFDM Series networks use a default cyclic prefix of 1/4 that is configurable by the operator to

1/8. The Cyclic Prefix is set on the

Conf

iguration => Radio page on the AP. Changing the default from ¼

to 1/8 can increase throughput by ~2 Mbps (assuming 75% duty cycle) in installations with low multipath

conditions. It is recommended to test 1/8 cyclic prefix to determine actual performance based on RF

conditions.

Procedure for setting the Cyclic Prefix

Set the Cyclic Prefix on the Configuration => Radio page of both the BHM and the BHS to 1/8 before

deployment

During installation use Link Tests to confirm link quality per standard installation and alignment

procedures.

If a Link Test shows low throughput or efficiency, consider changing the Cyclic Prefix to 1/4 on both the

BHM and the BHS along with other standard installation troubleshooting procedures such as re-aiming,

off-axis aiming, cha

nging location, raising or

lowering the height of the radio, adjusting Transmission

Power up or down, or identifying and mitigating sources of interference.

5 INSTALLATION

WARNING!

Installing a unit usually involves height, electricity, and exposure to RF (Radio Frequency) energy. To

avoid personal injury, follow applicable national and local safety regulations along with industry best

practices. Also follow the specific guidelines in this document, including Exposure Separation Distances

in section 6 on page 14.

5.1 INSTALLING AN AP WITH CONNECTORIZED ANTENNA

This section addresses installation aspects specific to the Cyclone 5700-360.OFDM Series AP. General

communications equipment, infrastructure, and facilities site design should be performed in line with

Motorola’s “Standards and Guidelines for Communications Sites” (also know

n as the R56 manual -

document #

68P81089E50-A)

These procedures are specific to the case of as AP purchased as a kit consisting of a connectorized

antenna and a connectorized radio. They are also generally applicable to connectorized APs, SMs, or

BHs when the antenna is purchased separately by the operator.

A short coaxial cable from the radio terminates in a male N connector. The antenna has a chassis-

mounted female N connector. The antenna includes tower mount brackets with adjustable down-tilt.