hich is One way to deal with the problem of delay and con- sent in a continuous bit stream. The line is monopolized gestion is to add bandwidth to the network at critical by a call until it is terminated, even when the caller is put junctures. Although this is feasible in the backbone, it is on hold and during periods of silence. Although this a costly and ineffective solution in the access arena, guarantees reliable and immediate transmission of voice, defeating the "bandwidth sharing" benefits of packet it results in very inefficient use of bandwidth. A line that networks. The best solution is to implement mechanisms is dedicated to the telephone cannot be utilized by other at the customer premises, access node, and backbone data even when there are no voice transmissions. that manage congestion and delay-without increasing Originally designed to handle bursty data traffic, bandwidth-such as setting priorities for different packet-switching networks (except for ATM) are types of traffic. Therefore, smart access equipment was Network infrastructure CHAPTER 3.2 developed that could implement procedures to reduce relatively short and, being compressed, require very little network congestion and the delay of voice packets bandwidth. They can therefore slip into the data network without adding bandwidth. alongside the heavy graphics, payroll information, e-mail, and other data traffic without perceptibly encumbering VoFR technology overall network performance. Frame Relay service providers have also begun to offer The significance of VoFR is very important because of its different QoS. Users can purchase the highest QoS, wide existence in the data network infrastructure. To Real-Time Variable Frame Rate, for voice and SNA have a flawless converged network with Frame Relay traffic. The second quality Frame Relay service, Non-Real network, we have to ensure several requirements of how Time Variable Frame, is typically purchased for LAN- VoFR can be deployed. Of the three popular packet/cell to-LAN and business-class I