interoperability issues between different vendors. Frame Relay Forum FRF.11 Implementation
Agreement establishes a standard for call setup, coding types, and packet formats for voice over
Frame Relay and will provide the basis for interoperability between vendors in the future.
voice is routed depends on which routing protocol is chosen to establish PVCs and the hardware
used in the Frame Relay network. Voice is routed to the configured PVCs. The PVCs are then
routed by the Frame Relay network. Routing can be based on bandwidth limits, hops, delay, or
some combination of these, but most routing implementations are based on maximizing
bandwidth utilization.
maximizes the ability to establish different Qualities of Service. This network minimizes
delay and improves voice quality at a huge cost.
thereby reducing the number of PVCs required. In this design, the central site switch
serves as a tandem switch and reroutes voice calls.
The presence of long data frames on a low-speed Frame Relay link can cause unacceptable
delays for time-sensitive voice frames. To reduce this problem, some vendors implement
smaller frame sizes by fragmenting large data frames to help reduce delay and delay variation.
approach to address delay and delay variation.
(delay-sensitive) data on lower-speed links. It accommodates the variation of frame sizes in a
manner that allows the mixture of real-time and non-real-time data. To ensure voice quality, the
Committed Information Rate (CIR) on each PVC must be set.