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NetVanta 160 Series Wireless Configuration Guide Introduction to Wireless Technology

Introduction to Wireless Technology

WLANs are becoming the new standard in small- and medium-sized business models. By using wireless

technology, users can become more productive while decreasing the cost of connectivity for the business.

WLANs provide an excellent alternative for growing businesses to the costly procedure of extending wired

local area networks (LANs).

WLANs replace Layer 1 transmission media, such as CAT 5 cabling, with radio transmissions that enable

wireless user connectivity and the extension of a wired network.

ADTRAN WLAN Components

There are many ways to incorporate WLANs into existing LANs. ADTRAN creates WLANs by adding

one or more AOS APs to an access controller (AC). In an ADTRAN WLAN network architecture, there

are four primary components: an AC, APs, radios, and VAPs.

The AC is usually a router or a switch that controls and configures the behavior of the AP. Each AOS AC

can control between 8 and 24 AOS APs (either NetVanta 160 Series standalone APs or embedded APs

such as the NetVanta 1335 Wi-Fi) and communicates with them using ADTRAN Wireless Control

Protocol (AWCP) during configuration and status querying.

The AP is connected to the AC through the Layer 2 broadcast domain and provides wireless access for

mobile users. The AP is configured by the AC and determines how users will connect to the network. The

NetVanta 160 and 161 APs contain internal 802.11a and 802.11b/g radios that can operate in 802.11a,

802.11a/n, 802.11b/g, 802.11b/g/n, or 802.11g/n modes. The NetVanta 161 AP can accommodate up to six

antennas for maximum network usability.

VAPs are logical entities that exist within the physical AP, yet appear to wireless clients as independent

APs. Each AOS AP supports up to eight VAPs per radio, and each VAP is identified by a service set

identifier (SSID).

Basic WLAN Structure

The basic structure of the WLAN is as follows: An AC resides on a wired network with Telnet and/or Web

access enabled for configuration, and a desired number of APs (up to 24) are wired to the AC. The APs

may be wired directly to the AC, or they may be connected to a switchport somewhere in the attached

network. The APs receive and transmit data to wireless clients, allowing client access in a range of

locations.

When arranging the WLAN components, there are a number of criteria to keep in mind.

1. The AOS APs will only operate in thin access point mode. This means the AOS AP must be hardwired

to an AOS AC, router, or switch somewhere on the network, so consideration must be given to the

distance and placement of the AOS AP in relation to the AC for the most coverage area for wireless

clients.

2. Obstructions and metal surfaces can create disturbances and interference in the wireless signals, so

consideration must be given to the area surrounding the AP.

3. Overlapping cells and channel reuse will occur when too many APs are placed too close together. This

overlap will result in signal degradation. To maximize user throughput, APs should be placed such that

overlapping of cells on the same channel does not occur.

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ADTRAN NetVanta 160 Manual de usuario Pagina 2