Page 150 - DCAP311_DCAP607_WIRELESS_NETWORKS

Wireless Networks

Notes
!
Caution Point-to-point topology is not just limited to networking use. You should be aware
that the direct connection of a PC to a printer follows a point-to-point topology. In fact, any
externally connected device, including modems or hard disk drives would also fall under
this classification.

Self-Assessment

Fill in the blanks:
1. A ..................................... is optimized for a larger geographical area than a LAN
2. ..................................... is the metropolitan area network standard for data communication
3. ..................................... provides a 100 Mbit/s optical standard for data transmission in local
area network that can extend in range up to 200 kilometers (120 mi).
4. Public libraries and ..................................... agencies typically use a MAN.
5. ..................................... links are an excellent way how to make connections between two
sites and achieve high data transfer speeds.
6. ..................................... is the medium through which information usually moves from one
network device to another.

9.4 Point-to-multipoint System

Point to multipoint wireless backhaul systems are made up of a Base Station Unit (BSU or AP)
that can communicate with multiple Subscriber Units (SU’s). Many systems can handle over 100
plus SU’s per BSU. In most cases the BSU’s provide a sector antenna beam pattern (typical is 60
degree, with some systems allowing external antenna configurations for expanding to 90 and
120 degree sector antennas). Multiple BSU’s can be installed to create a 360 degree sector (like a
typical cell site configuration).
Figure 9.2: Point to Multipoint Wireless

Subscriber Units
Enterprise Factory

Base Station Unit Subscriber Units
Remote Office
Subscriber Units

Residential

Subscriber Units
Campus Building
Source: http://www.aowireless.com/solutions/point-to-multipoint-wireless/

9.4.1 Point-to-multipoint Bridging

A wireless bridge is a device that allows two or more complete networks of users to transparently
communicate to one another over long distances without wires. These networks can be in the

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