he traffic in the switch, and severe jitter can make conversations very diffi- cult to understand. Dropped packets can cause clicks or pops, and a great deal of packet loss results in altogether unintelligible conversation. FRF.12 addresses the fragmentation of both data frames and VoFR frames. It reduces delay variation, segments voice signals into smaller data bundles, and, ulti- mately, provides better performance. Because bundles are smaller, when some get lost, the network feels less impact. Another VoFR consideration is the ability to prioritize voice traffic, which, of course, is very delay sensitive. The need for echo cancellation caused by round-trip delay is another consideration. Echo cancellation is required on voice circuits over 500 miles (800 km) long. A final consideration is voice interpolation. Equipment is needed to recreate lost voice information SO that retransmissions don't need to be performed because voice retransmissions would be ineffective. Unlike data, voice cannot wait for retransmissions to occur. Advantages and Disadvantages of Frame Relay The advantages of Frame Relay are as follows: Provides cost savings compared to leased lines Runs on multiprotocol networks Packet-Switched Networks Provides control over the user community Gives predictable performance and reliability (although with congestion, performance can be, at best, uneven) Provides minimum guaranteed throughput Allows for network management and control Provides greater bandwidth flexibility Disadvantages of Frame Relay include the following: Provides weak network management ability Is inherently unsuitable for delay-sensitive traffic, such as voice and video Requires high-quality digital circuits, so it does not work everywhere Is not entirely standardized Overall, Frame Relay represents a viable and cost-effective solution for data networking, particularly where LAN-to-LAN interconnection is the main goal. However, recently, Frame Relay has begun to be displaced by ATM and IP. Also, the introduction of IP VPNs and dedica