Bosch ICP-EZM2 Easy Series System Reference Manual page 21

Easy Series
2.5.4 wLSN Installation Tool Mode 3
When you perform the RFSS Site Test record the highest and lowest SNR readings because
you may need to compare them.
If the results for SNR fluctuate significantly, the location is:
–
–
To test the wireless devices with the Installation Tool in Mode 3:
1.
2.
3.
4.
5.
M
S
6.
7.
Signal to Noise Ratio
< 9 dB
9 dB
13 dB
16 dB
20 dB
22 dB
Table 2.5 Signal to Noise Ratio Data
If the location tests:
–
–
Bosch Security Systems, Inc.
OK if you subtract the dB difference between the highest (H) result and the lowest (L)
result, and the number equals more than 13 dB. Confirm the location is OK by testing
with the actual wireless device for this location. (L - (H - L) ≥ 13 dB = OK
Not OK if you subtract the dB difference between the highest (H) result and the lowest
(L) result and the number equals less than 13 dB. In this case, select a new location to
test. (L - (H - L) ≤ 13 dB = Not OK)
Verify that the wLSN Hub rotary switch is set to S1 = 9, S2 = 2, S3 = 0. Refer to Figure 1.1,
Page 6. The wLSN Hub's LED flashes slowly.
Go to the first device location, and then press and hold [*][#] on the Installation Tool for
2 sec.
Press [3] for Mode 3.
Place the Installation Tool in an upright position at the first device location, or hold it in
the location, if necessary.
Wait 10 sec and then review the display.
In the Mode 3 display, "SNR yy" refers to the signal to noise ratio in dB and "x" is the
RFSS value in dBm.
The Mode 3 display shows the signal to noise ratio (SNR) at the test spot. S refers to the
signal strength of the incoming message from the wLSN Hub to the Installation Tool. N
refers to the ambient noise level that exists at the location. The signal must be greater
than the noise (S>N). The higher the SNR, the stronger the location's signal at that
location. Dashes, appearing on both the S and N lines, indicate unacceptable signal
strength.
O D E
N R Y
Note the readings for the location, especially the SNR values.
Refer to Table 2.5 to interpret the results based on the lowest and highest readings.
If one or more of the results for SNR falls below 13 dB, the location is Not OK.
Signal Strength
Unacceptable
Marginal (not recommended)
Acceptable
Good
Very good
Excellent
OK: Confirm that the location is OK by testing it with the actual wireless device for this
location.
Not OK: Test a different location.
System Reference Guide
System Installation and Configuration | en
3 : S -
N -
x x x d B
x x x d B
F01U087835 | 02 | 2008.10
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