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Siemens Mobility Limited
Sopers Lane, Poole, Dorset
BH17 7ER
Version
11
Page 14 of 117
Status
Issued
Last Editor
Jeerh, Manpreet
Date
March 2020
Document
Name
WIMAG GENERAL HANDBOOK
Doc. No.
667/HB/47200/000
Copyright
©
Siemens Mobility Limited 2012. All Rights Reserved.
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.
Note:
The WiMag system vehicle detection latency is more than the SDE
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.
RF
1
Backplane
AP 1
RF
1
RF
1
RF
1
RF
2
1
2
Single step
Repeater
Configurator Access
Key:
WITHIN
CONTROLLER
CABINET
Ethernet cable
Mains Cable
TB
– TB Hardwired
Wireless link
Upstream (towards
AP)
Downstream
(towards sensor)
Existing controller
fixture
#
#
TEXT
Interface Card
RF
2
RF
2
2
3
Double Step
Repeater
RF 3
RF 3
RF 3
2
4
Double Step
Repeater
RF 4
RF 4
RF 4
Backplane
Interface Card
RJ45
–
24Vdc
48Vdc
Rack
Assembly
AP 2
RF 5
AP #
RF #
Figure 1 : Diagram of a typical Standard WiMag System Overview
–
Large Systems