Signal Level Requirements - EMS SmartCell Programming Manual

Signal level requirements

To ensure the signal levels for each device are at an acceptable level, the 'Device Signal List' menu should be
checked. This menu will display the signal level in two formats. The first format is a system overview that
will detail how many devices have a 'GOOD' or 'LOW' signal, or have 'NO SIGNAL'. This can be used as a guide,
so if you have a system with ten devices and the overview shows ten 'GOOD' signal levels, then there is no
need to view the devices individually. The second format allows you to view each individual device. A
pictorial representation coupled with Signal Level Test, is displayed for each device on the system. This is
listed in address number order. If any devices are under the signal level requirements, check the 'How to
improve device signal levels' section for guidance.
An example system with all devices showing acceptable signal levels is shown below:
Wireless system setup
Dual detector
Dual detector
Dual detector
Manual call point
Dual detector/ sounder
Dual detector/ sounder
Dual detector/ sounder
Manual call point
Manual call point
Dual detector
Dual detector
Dual detector/ sounder beacon
Sounder
An example system with devices showing both acceptable and unacceptable signal levels is shown below:
Wireless system setup
Dual detector
Dual detector
Dual detector
Manual call point
Dual detector/ sounder
Dual detector/ sounder
Dual detector/ sounder
Manual call point
Manual call point
Dual detector
Dual detector
Dual detector/ sounder beacon
Sounder
Meeting the acceptable signal levels shown ensures immunity to site attenuation (path loss) is met, as
required in clause 4.2.1 and annexe B of EN54-25.
©2020 EMS Ltd. All rights reserved.
Device number Shown on menu display
Device 01 Z1 A01 GOOD
Z1 A02 GOOD
Device 02
Device 03 Z1 A03 GOOD
Device 04 Z1 A04 GOOD
Device 05 Z2 A05 GOOD
Device 06 Z2 A06 GOOD
Device 07 Z3 A07 GOOD
Device 08 Z4 A08 GOOD
Device 09 Z4 A09 GOOD
Device 10 Z4 A10 GOOD
Device 11 Z4 A11 GOOD
Device 12 Z4 A12 GOOD
Device 13 Z4 A13 GOOD
Device Number Shown on Menu Display
Device 01 Z1 A01 NO SIGNAL
Device 02 Z1 A02 LOW
Device 03 Z1 A03 GOOD
Device 04 Z1 A04 GOOD
Device 05 Z2 A05 LOW
Device 06 Z2 A06 LOW
Device 07 Z3 A07 GOOD
Z4 A08 NO SIGNAL
Device 08
Device 09 Z4 A09 GOOD
Z4 A10 GOOD
Device 10
Device 11 Z4 A11 GOOD
Device 12 Z4 A12 GOOD
Device 13 Z4 A13 GOOD
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DIAGNOSTICS
Acceptable level
Acceptable Level
MK067-0001-99 (Issue 1) 04/11/2020 AJM