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User Reference and Installation Guide 2-23
© 2006 Microwave Data Systems Inc.
All Rights Reserved.
MDS
Digital Radio Series
05-4561A01, Rev. A
power level than needed to maintain the link in clear weather. Because transmit power remains
high when the weather clears, the level of
system interference increases.
Radios operating at high transmit power will interfere with other radios, even if the interfering
source is miles away from the victim. High interference levels can degrade signal quality to the
point that wireless radio links become unreliable and network availability suffers. The traditional
solution to system interference is to increase the distance between radios. However, the resulting
sparse deployment model is inappropriate for metropolitan areas.
In response to the need for a high-density deployment model the MDS Digital Radio Series use a
unique power control technique called A
d
TPC. A
d
TPC enables MDS Digital Radio Series units to
transmit at the minimum power level necessary to maintain a link regardless of the prevailing
weather and interference conditions. The MDS Digital Radio Series is designed and
manufactured to not exceed the +23 dBm maximum power allowed. The purpose of power
management is to minimize transmit power level when lower power levels are sufficient. A
d
TPC
also extends the concept of power management by controlling not only the power (dBm) of the
RF signal, but its quality (signal-to-noise ratio) as well.
In contrast to ATPC, the A
d
TPC technique dynamically adjusts the output power based on both
the actual strength and quality of the signal. Networked radios constantly monitor receive power
and maintain 10
-12
BER performance under varying interference and climate conditions. Each
radio detects when there is a degradation in the received signal level of quality and adjusts the
transmit power level of the far-end unit to correct for it.
A
d
TPC provides maximum power in periods of heavy interference and fading and minimum power
when conditions are clear. Minimal transmit power reduces potential for co-channel and adjacent
channel interference with other RF devices in the service area, thereby ensuring maximum
frequency re-use. The resulting benefit is that operators are able to deploy more radios in a
smaller area.
2.12 MDS Digital Radio Series Software and
Network Management
All Digital Radio Series parameters are accessible in three ways:
1. Using a standard web-browser via HTTP to access the built in webserver.
2. Via SNMP using the fully featured MIB, allowing for automation of data collection and
network management.
3. Via a command line client accessible from a terminal client connected to the serial port, or
telnet over the NMS Ethernet.
The GUI, SNMP, and CLI control are discussed in the Digital Radio Series User Interface Manual.