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2 System Overview
The WiMag system is made up of a number of key components, each of which plays an
important part. The heart of the WiMag system is a wireless magnetometer sensor, which
is installed just beneath the surface of the road. The sensor monitors the background
magnetic flux, and the disturbances of the magnetic flux caused by vehicles are then
detected. The sensor passes the detect information wirelessly back through to an access
point. The information is then passed via an interface card to a traffic controller.
The WiMag system vehicle detection latency is more than the SDE
Note:
requirement of 2ms. So the WiMag system cannot be used to provide vehicle
detections for speed discrimination.
Two illustrative system diagrams (below) are provided for reference.
Key:
Ethernet cable
Mains Cable
TB – TB Hardwired
Wireless link
Upstream (towards
#
AP)
Downstream
#
(towards sensor)
Existing controller
TEXT
fixture
Configurator Access
Figure 1 : Diagram of a typical Standard WiMag System Overview –
Version
11
Last Editor
Jeerh, Manpreet
Document
WIMAG GENERAL HANDBOOK
Name
Copyright © Siemens Mobility Limited 2012. All Rights Reserved.
RF 1
RF 1
AP 1
RF 1
RF 1
RF 5
AP 2
AP #
48Vdc
Large Systems
Page 14 of 117
Siemens Mobility Limited
1
2
Single step
Repeater
RF 2
RF 2
RF 2
RF #
Interface Card
Interface Card
Status
Issued
Date
March 2020
Doc. No.
667/HB/47200/000
Sopers Lane, Poole, Dorset
BH17 7ER
RF 3
2
3
RF 3
Double Step
Repeater
RF 3
2
4
RF 4
Double Step
Repeater
RF 4
RF 4
Rack
Assembly
Backplane
Backplane
RJ45 –
24Vdc
WITHIN
CONTROLLER
CABINET
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