Before Converged Networks

Remote Campus

Main Campus

Remote Campus

Main Campus

Traditional data traffic characteristics

• Bursty data flow

• First-come, first-served access

• Mostly not time-sensitive - delays OK

• Brief outages are survivable

Order Entry, Finance, Manufacturing, HR, Training, Other

Traditional data traffic characteristics

• Bursty data flow

• First-come, first-served access

• Mostly not time-sensitive - delays OK

• Brief outages are survivable

Systems, Inc. All rights reserved.

Order Entry, Finance, Manufacturing, HR, Training, Other

Before networks converged, network engineering focused on connectivity. The rates at which data came onto the network resulted in bursty data flows. Data, arriving in packets, tried to grab as much bandwidth as it could at any given time. Access was on a first-come, first-served basis. The data rate available to any one user varied depending on the number of users accessing the network at any given time.

The protocols that have been developed have adapted to the bursty nature of data networks, and brief outages are survivable. For example, when you retrieve e-mail, a delay of a few seconds is generally not noticeable. A delay of minutes is annoying, but not serious.

Traditional networks also had requirements for applications such as data, video, and systems network architecture (SNA). Since each application had different traffic characteristics and requirements, network designers deployed nonintegrated networks. These nonintegrated networks were designed to carry a specific type of traffic: data network, SNA network, voice network, and video network.

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