Point-to-Point Wireless

Typically a Point-to-Point connection is used to connect one office or building to another office or building when hardwiring is not available (or the phone company makes it cost prohibitive). Mote specifically, this could be because of distance limitations, saving money (wireless equipment is expensive it is a one time investment; using a leased line from the telephone company requires a monthly fee starting at about $350).

Transmitters Used

With a point-to-point connection the network administrator is free to use whatever wireless standard needed without worring about compatibility with a myriad of wireless cards found in a distributed network.

Transmitter Terminology

When you hear of transmitters you will probably hear of 3 types, Bridges, Access Points, and Workgroup Bridges. This is not as complicated as it sounds. These terms usually imply their capability. A bridge is universal, you buy two bridge transmitters and you are good to go. With Access Points and Workgroup Bridges, you need one of each for a point-to-point connection. The access point is capable of transmitting to multiple workgroup bridges, known as point-to-multipoint (Article coming soon).

Typically a company's wireless line (for network backbones) will either be a set of bridges or a set of access points and workgroup bridges. When you are dealing with a distributed wireless network for end users you will almost always be referring to access points (however a really expensive bridge can be used as an access point (even though it is a little overkill).

Purchasing Considerations

The things to focus on with a point-to-point connection is:

Line-of-sight
Distance
Minimum Speed Requirements
Security of data transmitted

Knowing these requirements will ensure that you choose a transmitter with the right security and power requirements and the correct antenna.

Cost

Expect to pay $800 per transmitter, $200 per antenna. The cost of transmitters can increase by $500 for models that are designed to handle outdoors. Indoor transmitters can be used but then you loose signal strength because you msut have a longer cable to reach your outside antenna.

Manufacturer	Average Price	Features	Max Distance
Cisco Aeronet 1400	~$3400	802.11a 250mW	7.5 mi.
Raylink WISP Bridge	~$800	802.11b/g 20mW	3 mi.
Alvarion Breezenet DS.11	~$1200	802.11b VLAN Support	15 mi.

For more information, contact Digital Foundation.

Article last reviewed: 01/05/2004

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Created by: Digital Foundation, inc.

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