Publication Number 53923. Issue 3, March 2016
Wayfarer 6 Generic Service Manual
Page 9
3.1.2
WLAN (Optional at build)
The
Wireless Local Area Network
(WLAN) is a flexible data communications
system implemented as an extension to, or as an alternative for, a wired LAN.
Using radio frequency (RF) technology, wireless LAN transmits and receives data
over the air, minimizing the need for wired connections. Thus, wireless LAN
combines data connectivity with user mobility.
In a typical wireless LAN configuration, a transmitter / receiver (transceiver)
device, called an (
Access Point
), connects to the wired network from a fixed
location using standard cabling. At a minimum, the access point receives, buffers,
and transmits data between the wireless LAN (
WIFI module
in the ETM) and the
wired network infrastructure. A single access point can support a small group of
users and can function within a range of less than thirty to one hundred metres.
3.1.3
WIFI (Optional at build)
Wi-Fi refers to the 802.11 standard which specify methods and techniques of
wireless local area network operation. The ETM contains a Wi-Fi module for
transmitting and receiving data between the bus and the access point in the depot.
3.1.4
3G/4G Data Transfer (Optional at build)
The
3G
network is an "always on" network for data. It uses an updated GSM
network to transmit and receive TCP/IP based data to and from mobile devices.
It
provides faster speed data transfer than GPRS, with typical data rates for HSPA of
4Mbps (down) and 1Mbps (up). The actual data rate which can be achieved varies
with the local infrastructure, propagation path and modem capability. Billing is not
based on time, but on the amount of data actually transferred.
4G
, where
available, will be significantly faster.
3.2 How Does the ETM Use GPS, WIFI and 3G/4G?
All vehicles are fitted with ETM’s. WiFi, GPS and 3G/4G modules are optional at
build.
As the driver proceeds along his route, details of all tickets issued or processed by
the ETM are stored in the memory of the machine. At the end of his shift, the
driver returns the bus to the depot. The depot is the location where all
information from the day’s transactions can be uploaded and analysed.
