Motorola PTP 400 Series - Manual (Page 189)

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Q: What else is special about the PTP 400 Series Bridge?
There are many special features built-in to the hardware of the PTP 400 Series Bridge. The
product offers the highest system gain in its class through high sensitivity antennas for
improved signal recovery. It also features a Software Defined Radio system that operates on
ultra fast digital signal processors but is controlled by firmware giving the ability to download
new firmware when enhancements become available. The PTP 400 Series Bridge has a built-
in web server for advanced management capabilities including detailed radio signal
diagnosis.
Q: In which frequency band does the PTP 400 Series Bridge operate?
The Motorola point-to-point PTP 400 Series Bridges operate in the 4.9 GHz USA National
Public Safety Band, the unlicensed 5.4 GHz (ETSI Band B) and 5.8 GHz (ETSI Band C and
FCC ISM band).
Q: Why does the PTP 400 Series Bridge operate in the 5 GHz band?
The 5 GHz band offers the dual benefits of high data throughput and good radio propagation
characteristics. The wide band of spectrum available is subdivided into several channels such
that multiple systems can operate in the vicinity without causing interference to one another.
Q: Is the PTP 400 Series Bridge an 802.11a device?
No. Although similar, the PTP 400 Series Bridge uses different encoding and radio
transmission systems than 802.11a. In areas where 802.11a systems are operating, the PTP
400 Series Bridge will detect the 802.11a radio signals and choose a clean channel away
from any interference.
Q: How much power does the PTP 400 Series Bridge transmit?
At all times the PTP 400 Series Bridge operates within country / region specific regulations for
radio power emissions. In addition, the PTP 400 Series Bridge uses a technique known as
Transmit Power Control (TPC) to ensure that it only transmits sufficient radio power such that
the other antenna can receive a high quality signal.
Q: How does the PTP 400 Series Bridge avoid interference from other devices nearby?
At initialization, the PTP 400 Series Bridge monitors the available frequency channels to find
a channel that is clean from interference. In operation, the PTP 400 Series Bridge
continuously monitors the spectrum to ensure it is operating on the cleanest channel.