Authorities seeking a cost-effective way to connect remote monitoring traffic cameras and navigation systems along highway routes can take advantage of the huge installed base of DSL lines to transport such Ethernet-based data.
The ASMi-54 from RAD Data Communications makes that possible. The ASMi-54 is an economical, managed SHDSL.bis modem that offers mid-band Ethernet connectivity based on multi-pair bonding technology. It is designed to be deployed in the type of ring and multi-drop topologies that typify transportation networks. Using advanced SHDSL.bis coding technology, the ASMi-54 reaches a data rate of up to 11.4 Mbps in each direction.
The ASMi-54 provides service resiliency and protection by implementing the ITU-T G.8032 Ethernet Ring Protection Switching standard for up to 11.4 Mbps of bandwidth. The device eliminates the need for an external switch and enables different Ethernet streams to be transported simultaneously, including data from traffic information panels, IP video and CCTV cameras and management. Quality of Service (QoS) attributes enable users to define different levels of QoS according to the application requirements and prioritization of each Ethernet service across the DSL line. Where fiber lines are available, the ASMi-54 is used with a RAD SFP transceiver.
The ASMi-54 also supports point-to-point Ethernet connections of up to 22.8 Mbps over 8 wires (4 pairs) using Ethernet in the First Mile (EFM) bonding of multiple copper pairs. EFM bonding ensures that a link failure does not drop the traffic being transmitted over the other wires in the group. Instead, total bandwidth is adjusted without any disruption in service. Monitoring, control and diagnostics of local and remote units are available via a supervisory port.
The ASMi-54 supports up to four 10/100BaseT ports with half/full-duplex auto-negotiation and flow control. Fault propagation enables the unit to shut down the Ethernet user port when an SHDSL line failure is detected.
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Features
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Benefits
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Ring and multi-pair bonding
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Lowers power consumption and enables smooth transmission over SHDSL or fiber links
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One-box solution
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Saves space and reduces maintenance costs
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Four physical Ethernet ports
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Eliminates need for external switch and enables connectivity of different types of Ethernet services
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Supports QoS priorioty queues
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User defines different QoS levels
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Weatherized
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Withstands adverse outdoor climatic conditions
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For applications requiring less bandwidth, RAD's ASMi-52 SHDSL modem and multiplexer can be deployed instead. The ASMi-52 extends the range of 2 Mbps data more than 4 kilometers over 2-wire or 4-wire, reaching a maximum of 10 kilometers (6.2 miles) for 64 kbps data. It supports E1 and T1, V.35, X.21 and RS-530 data, Ethernet bridge, and IP router user interface options. It has a built-in multiplexer capability with two user ports.
In highway applications, ASMi-series units can be deployed without repeaters even at intervals of 20 kilometers (12.5 miles) over a single copper pair. The device has been tested to withstand severe weather conditions, a significant benefit for outdoor highway applications.
RAD’s ASMi series modems have been deployed in highway applications in Austria, Germany, India, Italy, Japan, Spain, and the United Kingdom.
