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2.0
Resolution
For more accurate measurements, use the SNR values as shown in Table 2 when performing an RFSS test.
Use the wLSN Installation Tool only in Mode 3. Do not use the Installation Tool in Modes 1 or 2,
and do not use the individual wLSN devices to determine an acceptable SNR. The SNR
measurements in Modes 1 and 2 and directly from the devices do not correspond to the
recommended values indicated in Table 2.
Table 2:
Signal-to-Noise Ratio
< 30 dB
30 dB
35 dB
40 dB
45 dB
50 dB
To ensure that wLSN devices are operating at acceptable SNR values:
1. Connect to the control panel using a telephone.
Refer to the control panel documentation for connection options.
2. When prompted, enter the installer passcode.
3. Press [1] to enter the System Maintenance Menu, and then press [6] to enter the Wireless Configuration
Menu.
4. From the Wireless Configuration Menu, press [7]. When the control panel announces "Enter the number of
the programming item," press [2] for signal strength.
5. When the control panel asks for a point number, press [0][1] to [3][2] for Points 1-32, or [3][5] to [3][8] for
Outputs 5-8.
6. After a point or output number is entered, the hub communicates with the selected device to retrieve the
signal strength. The control panel announces the signal strength as two alphanumeric characters. For
example, "3 5." Refer to Table 3 to cross reference the spoken value to an SNR value.
Table 3:
SNR Values from the Control Panel
Control Panel Value
01 - 09
0A – 0F
10 – 13
14 – 16
17 – 1A
1B – 1D
1E – 20
21 – 32
© Bosch Security Systems, Inc. 2010
130 Perinton Parkway, Fairport, NY 14450 USA
www.boschsecurity.com
Revised SNR Values using wLSN Hub (ISW-BHB1-WX)
Signal Strength
Unacceptable
Marginal (not recommended)
Acceptable
Good
Very good
Excellent
SNR
Signal Strength
2 dB – 14 dB
Unacceptable
15 dB – 23 dB
24 dB – 29 dB
30 dB – 33 dB
Marginal
35 dB – 39 dB
Acceptable
41 dB – 44 dB
Good
45 dB – 48 dB
Very good
50 dB – 75 dB
Excellent
TBI 07-31-09_wLSN_SRN-02
Technical Bulletin
3/2010
wLSN Wireless Devices
Page 2 of 2
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