A Word About Radio Interference - Microwave Data Systems iNet 900 Quick Start Manual

8
Table 2.iNet Front Panel LED Functions
LED Label
COM2
PWR
LINK
(Access Point)
LINK
(Station
Adapter)

3.3 A Word About Radio Interference

The iNet 900 transceivers share frequency spectrums with other ser-
vices and other Part 15 (unlicensed) devices in the USA. As such, near
100% error-free communications may not be achieved in a given loca-
tion, and some level of interference should be expected. However, the
radio's flexible design and hopping techniques should allow adequate
performance as long as care is taken in choosing station location, con-
figuration of radio parameters and software/protocol techniques.
In general, keep the following points in mind when setting up your com-
munications network:
1. Systems installed in rural areas are least likely to encounter
interference; those in suburban and urban environments are more
likely to be affected by other devices operating in the license-free
frequency band and by adjacent licensed services.
2. If possible, use a directional antenna at remote sites. Although these
antennas may be more costly than omnidirectional types, they con-
fine the transmission and reception pattern to a comparatively nar-
row lobe, which minimizes interference to (and from) stations
located outside the pattern.
3. If interference is suspected from a nearby licensed system (such as a
paging transmitter), it may be helpful to use horizontal polarization
of all antennas in the network. Because most other services use ver-
tical polarization in this band, an additional 20 dB of attenuation to
interference can be achieved by using horizontal polarization.
MDS iNet 900 Installation Guide
DRAFT 6—8/29/01
Activity Indication
ON Not Defined
Blinking Data TX/RX
OFF No data detected
ON Primary power (DC)
present
Blinking Slow = Sleep mode
Quick = Alarm present
OFF Primary power (DC)
absent
ON Default state
Blinking
OFF Not Defined
ON Associated to AP
Blinking
OFF
Data Tx/Rx
Data Tx/Rx
Data Tx/Rx
MDS 05-2873A01, Rev. A