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Building an ATM Wide Area Network

July 26, 1999
By David Willis

Selecting Equipment
A wide variety of equipment is available for the ATM network, from sub-$3000 Access concentrators to $100,000+ multiservice switches. While you don't need to replace every component of your network to use ATM, the greatest management benefit is achieved when ATM penetrates further into your campus networks.


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When you're looking at ATM equipment, start with these features:
- ATM Forum standard compliance. In particular, IMA access equipment should use ATM Forum standards instead of proprietary methods - no matter how popular other alternatives have been historically.

- Flexible Queue Management. Some equipment may support only a few queues of limited depth, which will be inadequate for end-to-end Quality of Service.

- Integrated Link Management Interface 4.0 support. ILMI allows equipment to automatically configure addresses and monitor link health. It substantially reduces the need for manual configuration, and is the foundation of the ATM Forum's approach to automatic configuration of PVCs.

- Support for SVCs and PNNI, particularly for signaling real time services such as voice and video.

- Advanced Class of Service mapping. Equipment that can use the IP precedence fields for signaling relative priority and mapping to the appropriate ATM service class preserves end-to-end QoS.

- Support for IETF ATM SNMP and ATM Forum ATM-RMON MIBs. Carrier service level management tools are limited, so you'll need to build out a management system of your own.



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