ADTRAN 4106 Plan A, 4206 Plan A system manual Receiver Sensitivity, T1 Ports

Section 2 Microwave Path Engineering Basics TRACER 4106/4206 System Manual

Table 3 lists path loss values for various path lengths for both 2.4 GHz and 5.8 GHz systems. Values not listed in the table can be interpolated from those listed.

Table 3. Path Loss for Given Path Lengths

Path Length	Path Loss (dB)	Path Loss (dB)
(miles)	at 2.4GHz	at 5.8 GHz
1	104	112
2	110	118
3	114	121
4	116	124
5	118	126
10	124	132
15	128	135
20	130	138
25	132	140
30	134	141
35	135	143

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 4106/4206 is dynamic as a function of desired bandwidth; receiver sensitivity improves as delivered bandwidth decreases. In situations where 4xT1 connectivity is not required, the delivered bandwidth can be decreased to either 2xT1 or 1xT1, and the receiver sensitivity will be improved as follows:

Table 4. Receiver Sensitivity for the TRACER 4106/4206

Delivered	Receiver Sensitivity		Active
Bandwidth			T1 Ports
	TRACER 4106	TRACER 4206
4xT1	-93 dBm	-90 dBm	A – D
2xT1	-96 dBm	-93 dBm	A, B
1xT1	-98 dBm	-95 dBm	A

Should an interferer be present nearby, three software selectable bandplans are provided for frequency agility. Changing the TRACER 4106/4206 bandplan does not require additional components, or opening of the radio. See TRACER System Option > RF Bandplan on page 47 for additional details.

20 © 2004 ADTRAN, Inc. 612804206L2-1A