The only way to deliver that level of service is by adding QoS to the network, and now ATM has the most robust QoS features. Cisco's Kay has a different take on customer requirements. With such debates emerging, IT shops have to focus on what's the best way to manage through this transition. One feature many systems lack is DSL support, but vendors are moving to add DSL and other features to their wares. Many IADs include dedicated microprocessors designed to support a range of functions, like virtual private networking, PBX switching and even firewall filtering.
More bandwidth is another requirement.
So, in evaluating these products, IT managers should be careful. Outfitting a system to support a company's typical traffic requirements can raise the cost by two to 10 times the original price. In addition, the products may not deliver as much flexibility as users desire. For instance, few IADs dynamically allocate bandwidth for voice circuits, forcing customers to rely on permanent virtual circuits, which don't have the advanced bandwidth management features of switched virtual circuits. While the products offer benefits, such as low-cost access and simplified maintenance, customers must be careful when making a selection because the product category is not yet well defined.