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Video on Frame Relay
Tandberg
D11624 01
rev
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Tandberg Table of Contents 1. Introduction ................................ ................................ ................................ ................................ ............... 3 ................................ ................................ ............. 4 3. Technical issues ................................ ................................ ................................ ................................ ......... 5 4. Equipment for Video over Frame Relay .....................
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Tandberg 1. • • • D11624 rev. 01 3 merrily along at 30 frames per second with no evidence of tiling faults or frame drops. much traffic that 98 percent of data packets were thrown away, the video stream rolled Tests have shown that even when flooding the concurrently running Ethernet with so the payload. transmission space to carry frame relay packet overhead without impeding delivery of must be 1 percent to 3 percent higher than selected bandwidth; you'll need additional CIR(Committed Infor
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Tandberg 2. Voice, data & video over frame relay D11624 rev. 01 4 challenge is to expand the perceived scope of frame relay beyond a "data only" image. challenges of using frame relay to transport video have been met. The marketing positioning technique, not a fundamental technical limitation. All of the technical technology and service solution. This should be viewed primarily as a marketing and Historically, frame relay has been developed and sold primarily as a data transport standard H.320
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Tandberg 3. Jitter is created by differences in packet size D11624 rev. 01 5 length) based architecture between nodes, which also reduces the likelihood of jitter. unlikely. Also, many of today's Public frame relay networks use a cell (fixed frame is inversely proportional to speed, this means that delay at intermediate nodes is highly problem than a real problem. Public services run on high-speed backbones. Since delay However, for the majority of public frame relay networks, jitter is more a
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Tandberg Cell based systems cut packet into fixed sizes The only certain way is to have enough CIR to cover all usage. 1. D11624 rev. 01 6 to critically impair video function. performance. If a small frame packet is lost, it is not carrying too much information as allows network administrators to adjust the frame size for optimal network of the frame to be adjusted to carry larger or smaller amounts of information. This The first is the configuration of the frame size. Frame relay allows the pa
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Tandberg 2. 4. Using an external converter This is a simple solution, 4. 1 Framing the Picture D11624 rev. 01 7 bytes) are more efficient but increase the delay. It is possible to run the VFX-250S have less impact on the audio/video stream if they get lost. Long packets (up to 1.580 selected packet lengths. Short packets (for example, 256 bytes) add frame overhead but The VFX-250S creates standard frame relay frames with 6-byte headers and user- slip-free data transfer. to vary the outpu
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Tandberg 5. 250S D11624 rev. 01 8 frame relay networking facilities. which can be incorporated into an existing network providing an instant upgrade to service providers (FRADs). The VFX-250S is a ‘desktop’ enclosure, with AC power, required by video codecs and permits continuous bit stream access for frame relay standalone unit. In this application the VFX-250S provides the continuous bit stream continuous data bit-streams (such as H.320) over a frame relay service in the form of a continuous b
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Tandberg 6. D11624 rev. 01 9 Conferencing Unit) which can interface with multiple VFX-250S units. transmission over the network. This application also includes a MCU (Multi-point end point video-conferencing equipment and packetises it into a frame relay format for relay application. In this application the VFX-250S takes the H.320 datastream from the diagram below shows the use of the VFX-250S in a video-conferencing over frame The Application Overview Video on Frame Relay
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Tandberg 7. 7. 1 Network & User Interface 7. 2 User Interface 1.920 Mbps 7. 3 Network Interface 7. 4 Enhanced Buffer Management 7. 5 Serial Management Interface Configuration: • D11624 rev. 01 10 User defined Site Name be used to access the menu driven configuration system directly. Available Settings: the management of all the options within the unit. Alternatively, a "dumb" terminal can Windows-based configuration software is provided with the VFX-250S which allows for EIA-232, 9.6 Kbps & 1
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Tandberg • • • • 7. 6 Mechanical/Environmental 7. 7 Power Supply AC Input: 100 to 250 VAC (50 - 60 Hz), 15 W maximum Type: D11624 rev. 01 11 D: 10.2 cm (4.0") W: 6.6 cm (2.6") H: 3.8 cm (1.5") Size: North American/International power cords) Universal Desktop with IEC 320 AC input connector (can be supplied with a variety of 3,050 M (10,000 ft) Altitude: 10 to 90 % non-condensing Humidity: Non-operating:-20° to +70°C Operating: 0° to +50°C Temperature: D: 20.9 cm (8.3") W: 21.4 cm (8.4") H: 4
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Tandberg 8. hoods. 9. • • • D11624 rev. 01 12 Manual for technical details. network (FRAD) equipment and the user (video codec) equipment. Please see User conferencing application, install the VFX-250S in the frame relay network between the or PC communications port to configure and maintain unit settings. For a video- Dynamics (P/N LZUSD02001A0200). Connect the VFX-250S console port to a terminal supply and a standard AC outlet. Only use the power supply provided by Science VDC power suppl
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Tandberg 10. D11624 rev. 01 13 A return on the investment will be realised in a matter of months. be approximately $4,000 ($48,000 p.a). upgrade cost would then be approximately $2,000, thus the true monthly savings would This could then be upgraded to 512kbps (with a CIR of 384kbps). The incremental link (with a CIR of 64kbps) for voice / data requirements. In fact, a more realistic example would be a user who already has a 128 kbps frame relay found in combining video with existing voice, d
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Tandberg 11. 11. 1 Standard Console Cable D11624 rev. 01 14 The console port on the VFX-250S conforms to EIA-232/V.24 electrical specifications. Appendix A: Cables and Pinouts Video on Frame Relay
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Tandberg 11. 2 Standard EIA-449/RS449 Cables 11. 2 .1 Network Cable 11. 2 .2 User Cable A note about RTS signalling: D11624 rev. 01 15 of the RTS straps on page 11. is the case, then check the position signals for the control leads. If this levels) but actually use RS423 (which uses RS422 signalling their network interface is RS449 Some manufacturers state that Video on Frame Relay
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Tandberg 11. 3 Standard EIA-530/RS530 Cables 11. 3 .1 Network Cable 11. 3 .2 User Cable D11624 rev. 01 16 Video on Frame Relay
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Tandberg 11. 4 Standard V.35 Cables 11. 4 .1 Network Cable 11. 4 .2 User Cable D11624 rev. 01 17 Video on Frame Relay
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Tandberg 12. Pixelation D11624 rev. 01 18 - Local Area Network. LAN - Integrated Services Digital Network. ISDN frame relay. raw format, or by higher-level data-communications protocols, such as X.25 and - A standard, low-level, synchronous data bit-stream format, used either in its HDLC compression for Videoconferencing applications. - An international standard, which defines various functions of encoding and H.320 switching functionality. them onto a single frame relay data-stream. These devi
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Tandberg QoS - Time Division Multiplexing WAN 13. USA D11624 rev. 01 19 URL: http://www.scidyn.com Fax: +44 (0) 1252 365105 Fax: +1 (609) 751 7361 Tel: +44 (0) 1252 365100 Tel: +1 (609) 424 0068 E-Mail: intsales@scidyn.com E-Mail: sales@scidyn.com United Kingdom Fleet, Hampshire GU13 8PD Cherry Hill, NJ 08003 119 Fleet Road 1919 Springdale Road Science Dynamics International Ltd. Science Dynamics Corporation Appendix D: Information about the manufacturer - Wide Area Network. TDM - Service Le
