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Building an ATM Wide Area Network

July 26, 1999
By David Willis

First things First: Understanding your Network Requirements
Like any networking project, expanding an ATM network backbone requires a detailed understanding of your current traffic patterns and how they will change with future growth. Any wide area network project involves considerable expense and effort, and you won't want to implement a full deployment only to realize your organization's needs aren't being met.

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It is essential to build an application inventory, recognizing your organization's most critical applications. An approach was identified in the 'Analyzing your Bandwidth Needs' section of the Network Design Manual chapter 'Building a Frame Relay Network' http://www.networkcomputing.com/netdesign/frameg.html. This same approach can be extended to the ATM network, but you'll also need to study your voice and video calling patterns in addition to the data traffic your applications will generate.

Using worksheets that identify each application and its sensitivity to delay and loss, you should then group applications by Service Class, forming logical overlays on an underlying physical topology. Also note the current format of the traffic ­ ATM, frame-based LAN, Frame Relay, frame-based HDLC, bit-oriented video, etc. Later, you'll need to identify the ATM conversion methods you'll be using to transport the non-ATM streams across the WAN.



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