Bosch ISW-BHB1-WX Service-Handbuch

TECHNICAL BULLETIN

Intrusion wLSN Wireless Devices

Signal-to-Noise Ratio Values March 4, 2010

Issue Severity: Products Affected:

High: Act immediately

Medium: Bosch Security Systems, Inc.

strongly recommends you take the action(s)

described below.

Low: Advisory

•wLSN Hub (ISW-BHB1-WX)

•wLSN Installation Tool

(ISW-BIT1-HAX, -HBX, -HCX)

•Compatible wLSN Devices

1.0 Issue

The Signal-to-Noise Ratio (SNR) recommendations that are shown in the wLSN Reference Guide

(P/N: F01U009440) do not adequately ensure a trouble-free wireless installation in certain European markets

where multi-path signal fading might be present. Table 1 shows the SNR values that are currently published in

the reference guide.

Table 1: SNR Values using wLSN Hub (ISW-BHB1-WX)

Signal-to-Noise Ratio Signal Strength

<9 dB Unacceptable

9 dB Marginal (not recommended)

13 dB Acceptable

16 dB Good

20 dB Very good

22 dB Excellent

When the SNR values shown in Table 1 are used to measure signal strength, signal strength can fluctuate

significantly in locations where multi-path signal fading is present. As a result, the device might not be able to

communicate with the hub. If a communication failure occurs and is not resolved within the defined supervision

window, the control panel sends a missing device report to the central monitoring station.

130 Perinton Parkway, Fairport, NY 14450 USA

www.boschsecurity.com

TBI 07-31-09_wLSN_SRN-02

Technical Bulletin

3/201

wLSN Wireless Device

Page 2 of

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: Revised SNR Values using wLSN Hub (ISW-BHB1-WX)

Signal-to-Noise Ratio Signal Strength

<30 dB Unacceptable

30 dB Marginal (not recommended)

35 dB Acceptable

40 dB Good

45 dB Very good

50 dB Excellent

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 SNR Signal Strength

01 - 09 2 dB – 14 dB

0A – 0F 15 dB – 23 dB

10 – 13 24 dB – 29 dB

Unacceptable

14 – 16 30 dB – 33 dB Marginal

17 – 1A 35 dB – 39 dB Acceptable

1B – 1D 41 dB – 44 dB Good

1E – 20 45 dB – 48 dB Very good

21 – 32 50 dB – 75 dB Excellent

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