ADTRAN 6000 Series system manual Receiver Sensitivity for the Tracer Delivered Bandwidth

TRACER 6000 Series Integrated System Manual Section 2 Microwave Path Engineering Basics

Table 8. Path Loss for Given Path Lengths (kilometers)

Path Length	Path Loss (dB)	Path Loss (dB)
(kilometers)	at 2.4 GHz	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

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 9. Receiver Sensitivity for the TRACER 64x0

	Receiver Sensitivity
Delivered Bandwidth	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.

612806420L1-1F Copyright © 2005 ADTRAN, Inc. 23