28
UM/SWHM/V3/0115
•
IP 51 compliant
•
Multiple LEDs for Status indication
•
SIM card holder (sliding with sealing provision)
GSM/GPRS Specification:
•
Works with global Quad band. Can be used with any GSM operators
•
GPRS class B mobile station
•
Compliant with GSM phase 2/2- class 4 (2W @850/900 MHZ, class1
(1W@1800/1900MHZ))
7.1.4.
WI-FI
Wi-Fi
is a local area wireless technology that allows an electronic device to exchange data or
connect to the internet using 2.4 GHz UHF and 5 GHz SHF radio waves. These can connect to
a network resource such as the Internet via a wireless network access point. Such an access
point (or hotspot) has a range of about 20 meters (66 feet) indoors and a greater range
outdoors. Hotspot coverage can comprise an area as small as a single room with walls that
block radio waves, or as large as many square kilometers achieved by using multiple
overlapping access points.
Features and benefits of WI-FI
•
Enable staff to carry portable Wi-Fi handsets giving them the ability to work
anywhere, anytime.
•
Using Wi-Fi enables PDA’s and Laptops to deliver quick and easy access to information
•
Eliminate cellular usage charge.
•
Eliminate cabling and wiring for PC’s
•
Eliminate switches, adapters, plugs, pins, and connectors.
•
Secure networking using the latest secure networking protocols
•
Simplified management software.
•
Radio Frequency sweeping technology that disables rogue and ad hoc wireless devices
not relevant to the network
•
Fast roaming and seamless data packet transfer
•
Quality of Service or QO
7.1.5.
REMOTE UNIT
A
Remote Unit
(
RU
) is a microprocessor-controlled electronic device that interfaces objects
in the physical world to a distributed control system by transmitting telemetry data to a
master system, and by using messages from the master supervisory system to control
connected objects.
