Conformity Magazine - September 2008 - (Page 39)

he increasing demand for the transfer of higher volumes of information and the evolution of techniques allowing faster transfer of data between devices have had an important influence in the development of digital interfaces and signaling standards that allow internal and external data transfer at faster speeds. There are two major driving forces in the development of data transfer and encoding methods. The first driving force is the convergence of PC and multimedia technologies. Second is the increasing need for interoperability between different and more capable digital multimedia devices able to interconnect and exchange digital content. Trend of Digital Interfaces Supported by the increasing computing capabilities, processor speeds, and storage capabilities, we have witnessed over time the introduction of various types of interfaces, some of them aimed at specific applications and some of them for general purposes (see Figure 1). Low voltage differential signaling (LVDS) found its main application in data transmission between the graphics processor and the LCD panel (internal application), while SATA technology is aimed at storage applications (can be internal or used externally through the eSATA extension), and DVI, HDMI and the latest Display Port are technologies aimed at the digital displays field and which are expected to co-exist for some time. T A predominant factor that drives digital interface development is the data transfer rate (see Figure 2). This is reflected in faster movement of data in the case of USB, FireWire (IEEE1394), better resolution of images and audio in the case of DVI, HDMI, and Display Port. An important technological factor that has allowed the transmission of high speed digital signals is the advent of the differential data transfer signaling method. This has definitely marked a departure from the traditional parallel data flow and its limitations. All of the aforementioned digital interfaces use some type of signaling method based on differential pair transmission. The differential signal transmission method allows the serialization of packets of data which are then transmitted over a pair of traces or wires. Figure 1: Digital interfaces Beautiful But more than just a pretty face. The brand new three-phase EMC ﬁlters from Schaffner combine state-of-the-art ﬁlter technology and functional design. The choice is offered between traditional chassis-mount versions (FN 3025) and our contemporary DIN-rail mounting technique (FN 3026). Both ranges convince with: Highly compact and light weight plastic ﬁlter design Revolutionary embedded terminals for fast and easy connection Captive transparent covers for extra safety Exceptionally low leakage current (0.4mA and 2.5mA versions) Filter modules from 10 to 50A for up to 3x 520VAC Schaffner EMC Inc. 52 Mayﬁeld Avenue Edison, New Jersey 08837 T +1 732 225 9533 Toll free 1 800 367 5566 F +1 732 225 4789 www.schaffnerusa.com FN3025_26_8_125_x4_625.indd 1 September 2008 Conformity 39 08.02.2008 17:09:43 http://www.schaffnerusa.com http://www.schaffnerusa.com

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Conformity Magazine - September 2008 Contents Editor’s Note Commission Adopts Regulations for Internet-Based TRS Services Another Company Fined for Non-Compliance with HAC Requirements FCC Extends “Do-Not-Call” Registry Compliance Requirements Marketing Company Gets $1.4 Million Fine for Junk Faxes EU Commission Codifies Directive on TTE Market Competition EU Commission Releases Updated Standards List for the R&TTE Directive Updated Standards List for the “New” Low Voltage Directive Released New Standards List Released for the EU’s Machinery Directive The ESD Association: Voluntary Standards in Action ESD Open Forum Medical EMC Standards: Towards the 4th Edition of IEC 60601-1-2 iNARTE Informer Pre-Pulse Voltage in the HBM ESD Model Digital Interfaces and EMC Performance ESD Design Buyer’s Guide Product News Commission Publishes Updated Standards List for the EU’s Personal Protective Equipment Directive FDA Links “Human Factors” to Adverse Events with Medical Devices CPSC Actions in the News IEC Standards Update UL Standards Update Product Reviews Telcordia Standards Update From Our “You Can’t Make This Stuff Up” Department Looking Back: Items from Past Issues of Conformity Advertisers

Conformity Magazine - September 2008

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