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MTSW-115-24-T-S-160-RA

来源:LM317 Electronics Components编辑:Linx Technologies时间:2021-06-14 03:41:26

A VHDL-AMS model that has a discontinuity on a quantity at some time and does not execute a break statement is deemed erroneous.

Products built on the HomePNA specification offer a unique value proposition in that they allow consumers to enjoy the use of myriad home entertainment and information services through existing wiring at speeds upward of 10Mbits/s.

An important aspect of the technology is its ability to support a broadband network without disrupting telephone service. This means the same wires can carry DSL and HomePNA because they occupy different frequencies. In the rare occurrence of interference, the use of microfilters will resolve the problem.

MTSW-115-24-T-S-160-RA

The phone-line specification uses existing copper telephone wiring for data transmission and leverages Ethernet MAC (media-access-controller) layers to use the networking driver interface specification drivers that ship with today's PCs.

The difference between home phone-line networks and New Wiring Ethernet networks is the physical layer. The PHY must be able to transparently co-exist with telephone services such as POTS and ADSL. These system components need to support the random wiring topologies in homes as well as cope with the data reflections that occur when sending signals at high frequencies throughout the house.

Without a doubt, achieving the goals needed to make home networking a market success is a challenge. Various environmental factors exist that could compromise robustness and sacrifice data throughput of in-home networks. But there's no room for compromise if a trouble-free consumer experience is desired.

MTSW-115-24-T-S-160-RA

This is why phone-line networks rely on Frequency Division Multiplexing. FDM permits simultaneous handling of analog telephone service at 300 to 3,300Hz, ADSL at 28KHz to 1.1MHz, and phone-line networking at 4 to 10MHz. To avoid audible interference and comply with FCC regulations, phone-line network solutions are constrained to use signals with low energy levels that limit its peak power.

Multiple solutions

MTSW-115-24-T-S-160-RA

Clearly, the home of the future isn't going to depend on a single network technology. Instead, homes will contain hybrids of interconnected networks. Ultimately, consumers and applications will determine how products will play in the network.

As a result, other non-phone-line technologies will also find their way into the home. For instance, RF will continue to gather momentum. Bluetooth with its ad hoc methodology is expected to be the preferred wireless extension to the phone-line network because of its low cost and ubiquity. 802.11 will also continue to work its way into home LANs.

Carla Mahrt, worldwide distribution manager at the Tyco/AMP Raychem Circuit Protection division in Menlo Park, Calif., said the further away someone gets from a source, the harder it is to communicate. Knowing that, Tyco has implemented several strategies to span the distance.

One is the quarterly information packet (QIP), a home-grown reporting system that gives us details into specifics on applications in different regions,” Mahrt said. The QIP is updated online continually for representatives and distributors to see, and then it's rolled out each quarter by our regional managers.”

Salomon Smith Barney Inc.

A little over two months ago, we upgraded the semiconductor sector from neutral to outperform based on four points. The first was what we called Three Bottoms or a Funeral,” in which we noted our belief that the sector by August will hit three bottoms: order decline, unit shipment decline, and revenue decline (or the funeral would be ours).

Recent Semiconductor Industry Association data, show-ing semiconductor shipments declining 10% year-over-year, supports our estimate that shipments should trough in August, the toughest comparison in some 16 years. In addition, Department of Commerce order data for semiconductors, which is very volatile, already showed some promise of an uptick in April. These bottoms are important because going back five different downturns, IC stocks have tended to bottom within a couple of months of the fundamental sector trough.

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