Motorola MOTOwi4 Canopy 30, Руководство пользователя

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Issue 3.1, July 2006 Page 148 of 162
14 FAQs
Q: Can I source and use my own PoE adaptor with the 30/60 Mbps Backhaul?
No. The 30/60 Mbps Backhaul uses a non-standard PoE configuration. Failure to use the
Motorola supplied 30/60 Power Indoor Unit (PIDU) could result in equipment damage and will
invalidate the safety certification and may cause a safety hazard.
Q: What is Multi-beam Space-Time-Coding?
The 30/60 Mbps Backhaul radiates multiple beams from the antenna - the effect of which is to
significantly protect against fading and to radically increase the probability that the receiver will
decode a usable signal. When the effects of Space-Time-Coding are combined with those of
OFDM techniques and a best in class link budget, there is a significant improvement to the
probability of a robust connection over a non-Line-of-Sight path.
Q: What do you mean by “non-Line-of-Sight”?
A wireless connection between 2 points without optical Line-of-Sight. i.e. with obstructions in
between the antennas but the transmitted signal is still able to reach the receiver and produce a
good quality link.
Q: What else is special about the Canopy 30/60 Mbps Backhaul ?
There are many special features built-in to the hardware of the 30/60 Mbps Backhaul. The
product offers the highest system gain in its class through high sensitivity antennae 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 30/60 Mbps Backhaul has a built-in web server for
advanced management capabilities including detailed radio signal diagnosis.
Q : In which frequency band does the 30/60 Mbps Backhaul operate?
The Motorola 30/60 Mbps Backhaul operates in the unlicensed ISM band at 5.4 GHz (ETSI
Band B) - 5.7 GHz (ETSI Band C and FCC ISM band). This means no license is required to
operate the 30/60 Mbps Backhaul.
Q : Why does the 30/60 Mbps Backhaul operate in the 5 GHz ISM 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 30/60 Mbps Backhaul an 802.11a device?
No, although similar, the 30/60 Mbps Backhaul uses different encoding and radio transmission
systems than 802.11a. In areas where 802.11a systems are operating, the 30/60 Mbps
Backhaul will detect the 802.11a radio signals and choose a clean channel away from any
interference.
Q: How much power does the 30/60 Mbps Backhaul transmit?
At all times the 30/60 Mbps Backhaul operates within country / region specific regulations for
radio power emissions. In addition, the 30/60 Mbps Backhaul 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.