D-Link Air Xpert DI-774 Manual page 5

Wireless Basics
1.
The DI-774 is compatible with other D-Link Air Xpert A,B, and G
products, which include:
♦
5GHz Wireless Cardbus Adapters used with laptop computers
(DWL-AG650)
♦
5GHz Wireless PCI Adapters used with desktop computers
(DWL-AG520)
2.
The DI-774 is also compatible with the D-Link AirPlusXtremeG 802.11g
wireless family, which includes:
♦
High-Speed 2.4GHz Wireless Cardbus Adapters used with laptop
computers (DWL-G650)
♦
High-Speed 2.4GHz Wireless PCI cards used with desktop
computers (DWL-G520)
3.
The DI-774 is also compatible with the D-Link AirPlus 802.11b wireless
family, which includes:
♦
High-Speed 2.4GHz Wireless Cardbus Adapters used with laptop
computers (DWL-650+)
♦
High-Speed 2.4GHz Wireless PCI cards used with desktop
computers (DWL-520+)
Standards-Based Technology
The versatile DI-774 Wireless Router integrates 802.11a , 802.11b and
802.11g standards into a single unit.
The 802.11a and 802.11g standards designate that devices may operate at
an optimal data rate of 54 Mbps. This means that in most environments,
within the specified range of this device, you will be able to transfer large files
quickly or even watch a movie in MPEG format over your network without
noticeable delays. This technology works by transmitting high-speed digital
data over a radio wave utilizing OFDM (Orthogonal Frequency Division
Multiplexing) technology. OFDM works by splitting the radio signal into
multiple smaller sub-signals that are then transmitted simultaneously at
different frequencies to the receiver.
8
Wireless Basics
OFDM reduces the amount of crosstalk (interference) in signal
transmissions. D-Link Air Xpert products will automatically sense the best
possible connection speed to ensure the greatest speed and range possible.
The DI-774 is also interoperable with existing compatible 2.4GHz wireless
devices with data transfer speeds of up to 54Mbps (with the D-Link
AirPlusXtremeG family of wireless devices,) as well as standard 802.11b
technology ( the D-Link AirPlus family of wireless devices), with speeds of up
to 11Mbps.
Installation Considerations
The D-Link Air Xpert DI-774 lets you access your network, using a wireless
connection, from virtually anywhere. Keep in mind, however, that the
number, thickness and location of walls, ceilings or other objects that the
wireless signals must pass through may limit the range. Typical ranges vary
depending on the types of materials and background RF (radio frequency)
noise in your home or business. The key to maximizing wireless range is to
follow these basic guidelines:
1. Keep the number of walls and ceilings between the DI-774 and your
receiving device (e.g., the DWL-AG650) to a minimum each wall or ceiling
can reduce your D-Link Air Xpert Wireless product's range from 3-90 feet
(1-30 meters.) Position your receiving devices so that the number of walls
or ceilings is minimized.
2. Be aware of the direct line between routers and computers. A wall that is
1.5 feet thick (.5 meters), at a 45-degree angle appears to be almost 3 feet
(1 meter) thick. At a 2-degree angle it looks over 42 feet (14 meters) thick!
Try to make sure that devices are positioned so that the signal will travel
straight through a wall or ceiling for better reception.
3. Building Materials make a difference - a solid metal door or aluminum
studs may have a negative effect on range. Try to position wireless
devices and computers with wireless adapters so that the signal passes
through drywall or open doorways and not other materials.
4. Keep your product away (at least 3-6 feet or 1-2 meters) from electrical
devices or appliances that generate RF noise.
9