Encore 802.11GB WIRELESS PRINT SERVER - QUICK Bedienungsanleitung PDF herunterladen (Seite 11)

Analysis

As enterprises increasingly rely on wireless LANs (WLANs) for mission-critical communication, the challenges

of network design, network management, and problem diagnosis become more complex. WLAN vendor tools

must become more sophisticated in order to meet the everyday administrative demands imposed by a burgeoning,

increasingly sophisticated wireless network. In addition, WLAN vendors must strive to make WLAN networks

more deterministic and predictable by designing WLAN systems that are self-configuring, self-adjusting, and self-

healing.

Use Cases

This assessment compares 12 enterprise WLAN vendors to determine how well they satisfy the requirements for

three common uses cases: network design, network management, and problem diagnosis. Each use case was

defined in such a way as to highlight differences among the vendors rather than trying to be exhaustive in scope.

Network Design

Wireless network design is often more art than science. A countless number of variables can affect WLAN

performance and behavior. Vendors have responded to this complexity in three ways. First, many vendors make

use of increasingly sophisticated network-design tools such as the AirMagnet Planner or the Motorola

LANPlanner. These tools integrate complex three-dimensional (3D) models of various radio and antenna

technologies with environmental factors such as building construction and floor-plan layout to create predictive

network designs.

Most tools require that an administrator import a floor plan. In addition, the administrator must define the building

material and boundaries for the floors, walls, and ceilings (in some cases, the imported floor plan may already

contain some of this information). This can be a time consuming process and, at best, is an approximate model of

the actual environment. Most tools ask the user a series of questions about the design (e.g., “What are the voice

requirements?”). The tools also generate the required number and type of access points (APs) and automatically

place the APs on the floor plan.

The major drawback of these tools is that they create a static model of a dynamic network. Predictive network

designs cannot account for all of the real-time fluctuations in wireless behavior (refer to the overview “

Demystifying Radio Management” for more information on radio management). They provide a good “first cut”

design that enables enterprises to estimate the bill of materials (BOM) cost, create an installation plan, and deploy

a network. However, enterprises that attempt to continually refine their design will quickly reach a point of

diminishing returns.

The second method includes the use of site-survey tools such as AirMagnet Survey or Ekahau Site Survey. Site

surveys measure the signal propagation in the environment (e.g., lecture hall, hospital, or office) using the actual

APs that the enterprise intends to deploy. These tools enable the enterprise to assess the coverage, performance,

and signal strength throughout the actual deployment area and then map this information onto a floor plan.

Enterprises use the site survey to help the network-design tool more accurately reflect real-world environmental

characteristics. Most predictive design tools can import site-survey information. Some design tools can also

perform the survey.

Although a site survey improves design accuracy because it actively measures the nuances of signal propagation,

it also creates a static model of a dynamic network. In addition, site surveys are time intensive and therefore

costly. So, many enterprises do not perform site surveys for the entire enterprise. Instead, they selectively perform

the surveys in areas where they have particularly challenging radio frequency (RF) environments. Refer to the

Gartner document “Critical Components of Any WLAN Site Survey” for more informationon-site surveys.

BURTON GROUP 7090 Union Park Center Suite 200 Midvale · Utah 84047 · P 801.566.2880 · F 801.566.3611 · www.burtongroup.com

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 28 29

Kommentare zu diesen Handbüchern

Keine Kommentare

Encore 802.11GB WIRELESS PRINT SERVER - QUICK Bedienungsanleitung Seite 11

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Drucken & Scannen Encore 802.11GB WIRELESS PRINT SERVER - QUICK