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Tandberg Video on Frame Relay
D11624 rev.01 8
framer both at the ACT-recommended setting of 256 bytes and at 1.500 bytes (which is
in line with the recommendations of other framer users) without any difference in the
overall performance.
You can connect either the VFX-250S or the ABL VT2C directly to a DSU/CSU on a
frame relay network. The two products have another common trait: If you intend to share
the video stream with other types of traffic, you'll need to connect the VFX-250S or ABL
VT2C to one of the inputs on a FRAD or router acting as a frame relay switch.
5. About the Product VFX-250S
The VFX-250S product series from Science Dynamics Corporation offers a cost-
effective solution to the packetisation of continuous data bit-streams. The world of frame
relay users is becoming larger day by day, as are the different uses of frame relay
services. Corporate customers are adopting frame relay as a medium for many different
types of communication. The advent of FRADs has enabled users to integrate LAN-to-
LAN connectivity, inter-office voice communications, IBM SNA traffic, etc. over a
single frame relay circuit. The advantages of integration are, quite obviously, cost. The
transmission of video over any digital network requires the use of video
encoders/decoders (referred to as Codecs). Most video codecs, however, are designed to
run on "leased line" or ISDN type services which provide a transparent path for
continuous bit streams. Now, Science Dynamics brings support for the transportation of
continuous data bit-streams (such as H.320) over a frame relay service in the form of a
standalone unit. In this application the VFX-250S provides the continuous bit stream
required by video codecs and permits continuous bit stream access for frame relay
service providers (FRADs). The VFX-250S is a ‘desktop’ enclosure, with AC power,
which can be incorporated into an existing network providing an instant upgrade to
frame relay networking facilities.