DSL-2640T ADSL 2+ Router User Guide
8
Installation Considerations
Many physical environmental factors can impact wireless networks. Radio waves are used to carry the encoded data
between devices. These radio transmissions can become degraded due to signal attenuation, multi-path distortion and
interference or noise. Attenuation simply means that the strength of the signal weakens with the distance it travels, even
if the transmission path is unobstructed. Multi-path distortion occurs when radio signals bounce off objects like walls,
ceilings, metal appliances, etc. This may cause a signal to be duplicated, with each separate yet identical signal arriving
at a receiver at different times. Interference and noise from electrical devices such as microwave ovens, fluorescent
lights, automobile engines and other radio emitting devices can cause signal degradation. With all of this in mind,
choose a location for all your access points including the DSL-2640T.
The access point can be placed on a shelf or desktop, ideally you should be able to see the LED indicators on the front if
you need to view them for troubleshooting.
Wireless networking lets you access your network from nearly anywhere you want. However, the number of walls,
ceilings, or other objects that the wireless signals must pass through can limit signal range. Typical ranges vary
depending on the types of materials and background RF noise in your home or business. To range and signal strength,
use these basic guidelines:
Keep the number of walls and ceilings between the DSL-2640Tand other network devices to a minimum - each wall or
ceiling can reduce your D-Link wireless product’s range from 3-90 feet (1-30 meters.) Position your devices so that the
number of walls or ceilings is minimized.
Be aware of the direct line between network devices. 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! Position devices
so that the signal will travel straight through a wall or ceiling (instead of at an angle) for better reception.
Materials can impede the wireless signal - 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 dense, especially metallic, materials. Also, note that metal filing cabinets and appliances can reflect
radio signals. When these metal objects are moved around, your wireless network may be affected.
Keep your product away (at least 3-6 feet or 1-2 meters) from electrical devices or appliances that generate extreme RF
noise such as microwave ovens, CRT monitors, motors, etc.
