User's Manual

©e2v technologies (uk) limited 2010 107553 09 Aug 2010 DAS762156AA (UK) Version 11, page 52
The LRT system offers much greater range and has been tested between a basement and first
floor location in an adjacent building.
19. How many cameras can I connect at once?
For the Wi-Fi systems, no more than 3 cameras can be supported on a single wireless channel
due to the data rate required. Indeed, 2 may be the practical limit in many situations where other
networks are present or reception is poor. A wireless adaptor such as that offered in the
P7030RRS and P7030RKT is intended for a single connection, but this is made to the SSID. A
connection to the ‘argus4’ SSID may present 2 or 3 cameras as long as all the IP addresses are
different. In this case, the cameras can be chosen by IP address in the player software or several
instances of the player software may be run at once, computational power permitting.
Any additional cameras would require a further router or access point using a different radio
channel. With only channels 1, 6 and 11 being truly independent, the wireless connection limit is 9
assuming no other significant wireless traffic. A router may be preferred if multiple camera
operation is a regular requirement.
The limit in a wired system is the number of network sockets and achieving correct IP address
allocation, and of course the computational limits of the display computer. A router-based system
will support more than one computer but not to view the same camera.
The LRT system is limited by the number of independent RF channels available, which in turn
depends upon the local licensing conditions.
20. How many cameras can I view at once?
The receiver station and similar tablet computers are limited in computational power and may not
be able to decode more than one or two pictures at a time.
A modern PC or laptop will generally support 3 pictures at once.
The LRT system is limited by the number of independent RF channels available, which in turn
depends upon the local licensing conditions. Each receiver can be switched between any one
channel as described in section 8.
21. Are there security issues with Transmitters?
A Wi-Fi connection cannot interfere with the camera, and it is highly unlikely that a successful
viewing connection could be made without knowledge of the camera settings in this manual. The
computer should be safeguarded in the normal way with good sharing or connection passwords
and firewall/anti-virus software. It is also possible to lock to specific SSIDs or MAC addresses, or
to employ some encryption depending upon the options offered by the network equipment.
Eavesdropping is much more difficult with this system than with traditional analogue ones. Setting
encryption or changing the camera from the factory default IP address will protect the system
further. However, there is no guarantee of security with any radio-based system.
The LRT system is significantly more difficult to intercept than Wi-Fi, essentially requiring a
matching receiver.
22. Why is my wireless link connecting to another network?
This may occur when there is a stronger signal from another network nearby, or sometimes when
a network adaptor finds one of the same brand. This tendency may be reduced by using Windows
built-in wireless networking because it favours connection to the most recently-used network. It is
also possible to lock to specific SSIDs or MAC addresses depending upon the options offered by
the network equipment.
Selection of a different channel as described in FAQ 25 may also help.