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Large organizations
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Surveillance services
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Distance learning
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Information distribution
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Video clip entertainment
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Ethernet Direct is a RAD Data Communications solution for providing transparent Ethernet connectivity over any type of WAN infrastructure.
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Ethernet Direct comprises a large number of products and applications, all of which are based on the ChipBridge, an innovative chip designed and manufactured by RAD.
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The FCD-E1/T1 is a CSU/DSU for accessing E1/T1 leased line services at the customer premises.
The need for MPEG over IP solutions is growing due to the increased use of MPEG video compression techniques and the transport of video-type content via TCP/IP. The FCD-E1/T1 provides an MPEG over IP solution for delivering video streams over E1/T1 networks. Its optional Ethernet bridging interface, based on RAD's unique ChipBridge, provides wire-speed forwarding of Ethernet frames to an E1/T1 link without introducing any delay variation (jitter). This feature is of prime importance in MPEG over IP.
The FCD-E1/T1 is used to bridge between two Ethernet LANs over an E1/T1 leased line. It can connect each Ethernet LAN directly to the E1/T1 link at speeds of up to 2.048 Mbps. The diagram below shows a variation of this application where the RAD DXC multiservice access node with an external TinyBridge connects the central LAN to several remote sites over E1/T1 links. The DXC receives input from the Ethernet LAN via the TinyBridge, duplicates the traffic stream and broadcasts to two or more remote sites.
What makes the FCD-E1/T1 especially useful in the video environment?
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Features
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Benefits
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Layer 2 bridging/MAC filtering at wire speed
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Can be used for any layer 3 traffic (e.g., IP, IPX, AppleTalk)
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Does not depend on user station operating system
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Does not introduce delay variation (jitter) into video stream
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Automatic learning and aging of MAC addresses
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Adapts to changes in remote site topology
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Guaranteed not to drop frames during processing
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The quality of the video picture is not degraded due to dropped packets
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Maximum theoretical throughput of 15,000 packets per second
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Allows maximum utilization of E1/T1 bandwidth
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Operates in simplex or duplex mode on the E1/T1 link
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Supports both video broadcast and asymmetric video/data connections
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Plug-and-play Ethernet interface
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Connection of Ethernet LANs over E1/T1 leased line services is transparent to users
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Standard E1/T1 service termination features (e.g., BERT, external clock support, loopback)
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Supports connection to carrier E1/T1 networks in addition to private corporate E1/T1 networks
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Synchronous port
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Supports direct connection of DVB and other video-type traffic over any synchronous connection
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Disadvantages of alternative solutions
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Alternative Solutions
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Disadvantages
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External router or bridge connected to data port of E1/T1 CSU/DSU
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CPU- and software-based solutions suffer from congestion and dropped packets and therefore reduce the quality of video playback Relatively expensive May require extensive configuration
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Dedicated E1/T1 port on MPEG over IP device
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Less support for E1/T1 service termination Relatively expensive
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