Proxim CPN 65756B Receiver Sensitivity and Minimum SNR for a Good Link, Normal Mode, Turbo Mode

Tsunami MP.11a Antenna Installation Guide

An EIRP limit is the maximum RF energy that can be transmitted, as measured at the transmitting antenna, and is usually determined by government regulations.

Table 2. Receiver Sensitivity and Minimum SNR for a Good Link

Normal Mode	Receiver	Minimum SNR for	Turbo Mode*	Receiver	Minimum SNR for
(Mbps)	Sensitivity	a Good Link	(Mbps)	Sensitivity	a Good Link
54	- 69 dBm	21	108	- 66 dBm	21
48	- 73 dBm	20	96	- 70 dBm	20
36	- 77 dBm	16	72	- 74 dBm	16
24	- 81 dBm	12	48	- 78 dBm	12
18	- 84 dBm	9	36	- 81 dBm	9
12	- 86 dBm	7	24	- 83 dBm	7
9	- 87 dBm	5	18	- 84 dBm	5
6	- 88 dBm	4	12	- 85 dBm	4

* allowed in FCC regulatory domain only

The first Fresnel zone size is a list; Proxim’s recommendation is to keep at least 60-70% of this zone free. If the clearance is lower than this percentage, the link budget and achieved fade margin are affected.

Clearances more than 100% of the Fresnel zone can cause reflections that are 180 degrees out of phase and can cancel out the signal. The Fresnel zone works in both the horizontal and vertical paths.

Table 3. Output Power Table for FCC

Frequency Band	Channels	54 Mbps	48 Mbps	36 Mbps	6-24 Mbps
5.25 – 5.35 GHz	52, 56, 60	14.5	15.5	17.5*	18.5*
5.25 – 5.35 GHz	64	12.5	12.5	12.5	12.5
5.745 – 5.850 GHz	149, 153	13.5	15.5	17.5	18.5
5.745 – 5.850 GHz	157, 161	13.5	15.5	17.5	17.5
5.745 – 5.850 GHz	165	12.5	15.5	17.5	17.5

*17.4dBm is the FCC certified peak output power of Tsunami MP.11a product at 5.25-5.35GHz band

**20.8dBm is the FCC certified peak output power of Tsunami MP.11a product at 5.725-5.850 GHz band

These power levels are the levels at the antenna connector of the MP.11, so where the MP.11 has a higher output power than certified, the TPC needs to be used to reduce the output power.

Chapter 2. Determining Range and Clearance	23
CPN 65756B	Issue Date: August 2003