ADTRAN 12804108L1A System Manual

Section 2 Microwave Path Engineering Basics TRACER 4108/4208 System Manual20 © 2003 ADTRAN, Inc. 612804208L1-1BTable 3 lists path loss values for various path lengths for both 2.4 GHz and 5.8 GHz systems. Values notlisted in the table can be interpolated from those listed.5. RECEIVER SENSITIVITYReceiver sensitivity is a value expressed in decibels referenced to one milliwatt (dBm) that corresponds tothe 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 (higherquantity negative number) is better for a given BER. Several factors affect receiver sensitivity includingthe data bandwidth of the wireless link, and the amount of additional signal degradation introduced in thereceiver electronics.Receiver sensitivity of the TRACER 4108/4208 is dynamic as a function of desired bandwidth; receiversensitivity improves as delivered bandwidth decreases. In situations where 8xT1 connectivity is notrequired, the delivered bandwidth can be decreased to either 4xT1 or 2xT1, and the receiver sensitivity willbe improved as follows:Table 3. Path Loss for Given Path LengthsPath Length(miles)Path Loss (dB)at 2.4GHzPath Loss (dB)at 5.8 GHz1 104 1122 110 1183 114 1214 116 1245 118 12610 124 13215 128 13520 130 13825 132 14030 134 14135 135 143Table 4. Receiver Sensitivity for the TRACER 4108/4208DeliveredBandwidthReceiver Sensitivity ActiveT1 PortsTRACER 4108 TRACER 42088xT1 -90 dBm -85 dBm A – H4xT1 -93 dBm -89 dBm A – D2xT1 -97 dBm -92 dBm A, BShould an interferer be present nearby, three software selectable bandplans are providedfor frequency agility. Changing the TRACER 4108/4208 bandplan does not requireadditional components, or opening of the radio. See TRACER System Option > RFBandplan on page 47 for additional details.