3Com NJ220 - IntelliJack Switch Caratteristiche Manuale - Pagina 12

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S W I T C H — V L A N S & T R A F F I C P R I O R I T I Z AT I O N

IT staff can use VLANs to partition traffic streams into easily manageable and securable

groups. Automated traffic prioritization can significantly improve network and applica-

tion performance, particularly for time-sensitive transmissions such as voice and video.

The following scenario, while fictional, demonstrates how these two advanced switch-

ing features can solve real-world problems and deliver significant time and cost savings.

In an effort to converge and consolidate, a large aerospace corporation had successfully

migrated business-critical resources onto the network. The core switching infrastructure

was upgraded, DSL Internet router installed, and PSTN phones were replaced by a VoIP

telephony system.

News of an upcoming satellite launch sent draftpersons and engineers dashing to their

desktops to watch via the live webcast. All this Internet traffic sent network loads soar-

ing—creating access bottlenecks and slowing application response. In particular, a

telephone conference with a trans-Pacific client suffered in quality and usability. The

meeting ended up being postponed until the next day, a 24-hour delay that cost the

company many thousands of dollars.

This disaster might have been avoided if IT staff had installed 3Com NJ205 IntelliJack

Switches in all offices and conference rooms as part of the infrastructure upgrade. Using

port-based VLANs, all VoIP transmissions could have been directed through their own

subnet, regardless of what conference room was being used. In addition, the Default

Priority Level could be set to recognize the IEEE priority tag for VoIP (value = 6), which

would help ensure that this extremely time-sensitive traffic gets preference over stream-

ing video (value = 4).

3Com NJ205 IntelliJack Switches work in almost any network environment—including

small-office or enterprise businesses, government offices, dormitories, hospitals, school

classrooms, universities, laboratories, public kiosks, conference rooms, and shared

office spaces.

For more information on how these managed "in the wall" switches can resolve common

networking problems and significantly lower IT costs, please visit