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TRACER 6000 Series Integrated System Manual Section 2 Microwave Path Engineering Basics
612806420L1-1F Copyright © 2005 ADTRAN, Inc. 23
5. RECEIVER SENSITIVITY
Receiver sensitivity is a value expressed in decibels referenced to one milliwatt (dBm) that corresponds to
the minimum amount of signal power needed at the receiver to achieve a given bit error rate (BER).
Receiver sensitivity is usually a negative number of decibels, and smaller receiver sensitivity (higher
quantity negative number) is better for a given BER. Several factors affect receiver sensitivity, including
the data bandwidth of the wireless link and the amount of additional signal degradation introduced in the
receiver electronics.
Receiver sensitivity of the TRACER 64x0 is dynamic as a function of the desired bandwidth; receiver
sensitivity improves as delivered bandwidth decreases. TRACER bandwidth is provided in the form of
eight channels available for mapping to the support modules. For T1 and E1 modules, each channel
mapped represents a single T1 or E1 interface. For Quad Ethernet Switch modules, each channel mapped
represents 2 Mb of Ethernet data delivered to the module. In situations where eight-channel connectivity is
not required, the delivered bandwidth can be decreased to four or two channels, and the receiver sensitivity
improves as follows:
Table 8. Path Loss for Given Path Lengths (kilometers)
Path Length
(kilometers)
Path Loss (dB)
at 2.4 GHz
Path Loss (dB)
at 5.8 GHz
1 100 108
2 106 114
3 110 117
4 112 120
5 114 122
10 120 128
15 124 131
20 126 134
25 128 136
30 130 137
35 131 139
Table 9. Receiver Sensitivity for the TRACER 64x0
Delivered Bandwidth
Receiver Sensitivity
TRACER 6410 TRACER 6420
8xT1 -86 dBm -85 dBm
4xT1 -90 dBm -89 dBm
2xT1 -93 dBm -92 dBm
8xE1 or 16 Mbps Ethernet -84 dBm -83 dBm
4xE1 or 8 Mbps Ethernet -88 dBm -87 dBm
2xE1 or 4 Mbps Ethernet -91 dBm -90 dBm
Should an interferer be present nearby, three software-selectable band plans are provided
for frequency agility. Changing the TRACER 64x0 band plan does not require additional
components or opening of the radio. See > RF Link Configuration > RF Band Plan on
page 64 for additional details.