Sa Wireless

Contact Us About Us Webmail Forum Site map
  Home products & Services solutions SUPPORT Branches


Wireless Internet Service Provider  


Wireless Internet Service Provider


The Wireless Internet Service Provider System (WISP) is an integrated Metropolitan Area Network (MAN) system of connecting customers to the Internet. High-speed wireless datalinks are used to provide Internet access on a point-to-point and point-to-multipoint basis for companies, governmental organizations, schools, universities and other institutions having Local Area Networks (LAN).

Wireless data links take place of dedicated leased lines where the leased line connection is not possible or too expensive. Basic requirements for using wireless data links are:

  • Customers are located within 10 miles or 15km radius around the central site.
  • Direct Line of Sight between Customer location and the central antenna.
  • Use of the 2.4GHz, 5.2GHz or 5.8GHz frequencies according to the local regulations. In some countries obtaining a special license might be required.

Exceptional Benefits of Wireless:

  • High Speed Data Links (Up to 54 Mbps),
  • Fast Installation of the Base Station (one or two days),
  • Fast Installation for your customers (2 to 6 hours installation per site),
  • Cost effective access for prolonged use and multiple users,
  • Reliable and instant 24 hour Internet access 

The WISP can be obtained from Sa Wireless as ready to install Base Station and CPE (Customer Premises Equipment). All necessary parts of the wireless links are available as well.

Sa Wireless is supplying wireless equipment to customers and providing installation services all around the World.

How to Start a Wireless ISP

The following material is meant to help you with what steps are necessary to start a Wireless Internet Service Provision System (WISP). Under WISP we understand an integrated Metropolitan Area Network (MAN) system of connecting customers to the Internet. High-speed wireless datalinks are used to provide Internet access on a point-to-point and point-to-multipoint basis for companies, governmental organizations, schools, universities and other institutions having Local Area Networks (LAN).

First of all, you should answer the main question:

Are you already an Internet Service Provider (ISP)? I.e.,

  • Does your company have a permanent (256kbps or faster) Internet connection?
  • Do you have experience providing basic Internet services to the customers?
  • Are you running a domain name server, e-mail server, http and ftp services?
  • Do you have experience providing leased line connection and dial-in services to the customers?

If your answer to this question is YES, then you can proceed with your plan of becoming a Wireless ISP and follow the suggestions given in this material.

Should your answer be NO, then please understand you must first become an Internet Service Provider.

Those, who are Internet Service Providers, can start finding answers to following questions:

Q1: Do you expect to have the necessary customer basis for a Wireless ISP System in your city?

Generally speaking, you should consider the WISP just like permanent leased line connections to the customers, but at a higher speed and lower cost. Please read about What is a WISP, and what not*.

*What is a WISP, and what not? The Wireless ISP System is a fixed wireless service between the central node and the client. It is not a mobile service, at least in most of the cases, because:
-- Direct line of sight is required between the central node and the client, and
-- Low power radios and high gain antennas are used for the wireless links.
The Wireless ISP System operates at the 2.4GHz, 5.2Ghz or 5.8GHz ISM band. It does not operate at 900MHz because of the interference with the GSM telephone networks.

The Wireless ISP System is a land service operating as a Metropolitan Area Network with cells of 10 miles or 15 km. radius. It is not a Satellite ISP System. The Wireless ISP System is a bi-directional service, where both the client and the central node is sending and receiving data. It is not a transmitter - receiver system, every node does both tasks.

Q2: What are the regulations and rules for using the 2.4GHz, 5.2GHz or 5.8GHz wireless data communication equipment in your country?

In most cases you will need to get a permission to use the frequency, but sometimes a license might be necessary for providing wireless service. We provide our customers with copies of the necessary Certificates and Type Approval Documents that might help you getting things organized legally. Check the list of available documents by contacting us by e-mail.

Q3: Is the setup of wireless connections technically possible?

The system operates on a point to multi-point basis, and consists of a base station and several client nodes within 10 miles or 15 km. radius around it. The client nodes connect to the base unit over wireless links. Therefore, direct line of sight* is required between the client antenna and the base station antenna in order to establish the wireless connection.

*Direct line of Sight between two points is ability to see from one point the other point without any physical obstacles, like trees, leaves of the trees, branches of the trees, buildings, walls, roof constructions, hills, forests.

For longer distances, there can be problems with ensuring the line of sight due to the Earth curvature. For example, direct line of sight can be ensured between two points located between each other at a distance of 30km, if they are risen at 17m height. Please use the Distance Calculation Utility provided by Sa wireless.

Q4: What would be the best location for the Base Station?

You should consider a high location for installing the central antenna, so that all your client antennas could see the central antenna without any obstacles, i.e., they should have direct line of sight with the central antenna. Some suggestions for best locations of Base station antenna could be:

  • Top of a high building somewhere in the city
  • Top of a building located on a hill
  • high tower (TV or some communication tower) 

    It is very important, that you can find such a location, where the Base Station antenna and the Base Radio Unit can be installed closely, e.g.,
  •  antenna on the roof of a building and base unit in the attic,
  •  antenna on a communication tower and base unit in a weather-proof box attached to that tower.

    Although a low loss cable is used for connecting the antenna to the Base Radio Unit, its length should be as short as possible to avoid signal loss. The cable length should not exceed 9m without an amplifier. Do not plan to have longer cables, or to substitute low loss cables with some lower quality ones � your system won't work!

    Also, you will need to organize 220V power to the base unit, uninterruptible power supply is recommended.

Q5: What equipment and preparations are needed for the Client Site?

For client site you will need to consider where to mount the directional parabolic grid antenna, where to put the wireless router and how to connect it to the client's LAN and to 110V or 220V power. Again, you should find a place for the router, where the distance to the antenna is minimal. You should better consider using a shorter antenna cable and extend the LAN�s cable [and power] to the place where you install the router. Although longer cables (20-40m) are acceptable, when connecting over short distances (1-2km) to the base unit, we recommend using 10m cable.

Typical locations for the client antenna are:

  • roof of the building, antenna attached the pipe holding TV antenna, or a specially installed pipe for your antenna,
  • wall of the building
  • window frame, antenna mount attached to the window frame of a room, where the wireless router is located

Q6: How to install and configure the central site with the base unit and omni-directional antenna?

When the place has been found for the omni-directional antenna and for the base unit, the antenna should be mounted and cable connected to the antenna and to the base unit. Connectors outside the rooms should be protected using weatherproof rubber material tape to avoid moisture coming into the connectors. Ordinary electrical tape should be put over the rubber protecting tape. Electrical tape alone does not protect the cable connections hermetically enough. Within a few months moisture will be inside the cable connections, and the quality of your system will be degraded.

What concerns the minimum required configuration of the base unit, you should choose the frequency your system will be operated at, the basic data rate, and the system identifier. Only clients having the same radio settings will be able to work with your base unit. More options for configuring the base unit are explained in the manual for it.

Q7: How to install and configure the client sites with the wireless router and directional antenna?

The directional antenna should be mounted vertically polarized, since the base unit (omni-directional) antenna is vertically polarized. The same rules as described above are applied for connecting and protecting the cables. The antenna should be pointed directly to the central antenna. Performing link test between the base unit and client router should do final adjustment.

Q8: What are possible TCP/IP network configurations for the WISP system?

Usually the client LANs may have the TCP/IP protocol running with unregistered IP addresses. You may leave the addresses as they are and take one free address from the client's network for the Ethernet interface of Wireless Router. Alternatively, you may provide the client with a subnet from the network addresses that you have as an ISP. The Ethernet address of wireless router is default gateway for all hosts on the clients LAN.

The Wireless LAN is another TCP/IP network, since it is separated from the client networks by routers. An IP subnet should be assigned to the hosts on the wireless LAN including the wireless interfaces of all client routers and the base unit, one address to each of them. The following should be considered when setting up default gateways for all client routers and the bridge.

  • If the wireless network is connected to your network, i.e., the base unit's Ethernet port is connected to your/ISP�s network cable, then the default gateway is that host/router, what is used for your network. Note that the base unit is a bridge and not a router, therefore it does not serve as a TCP/IP gateway. See the possible setup diagram.
  •  If you use one of the wireless routers as a gateway to connect the wireless network to your/ISPs network, then use the radio interfaces IP address as the default gateway for all client routers and the base unit. See the possible setup diagram.

    Use traceroute and ping to test how well you have done the TCP/IP configurations. Read textbooks and RFCs once more if you have forgotten the basic things about IP networking and routing. But remember, that nothing will help you to get pings going between two hosts and further, if you have problems with the radio connection. It's just like if you have cabling problems, you cannot ping.

    Installation Information

    We offer World Wide Installation and Training Service for the Systems you purchase at Sa Wireless.


  • The network configuration and installation should be planned ahead. Our technical staff will consult you via e-mail, fax, or over telephone.
  • Sites should be prepared for installations (place to mount the antenna and the radio equipment, 110 or 220V power and Ethernet cabling should be available there).

    Customer should cover the following expenses:
  • Round trip travel cost from South Africa to your location
  • Accomodation cost during the work
  • Entry visa for your Country and other necessary expenses (medical insurance, vaccination, etc.)

    We charge $300.- per day and per installer plus travel time from South Africa (RIX) and back. Usually three days of work are enough to install one base station and up to three client sites, if the Customer is well prepared for the installation. Training is provided for your technical staff during the installations and, if necessary, afterwards.

[ Top ]



Copyright 2000-2007 Sa Wireless All rights reserved.