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[January 04,=20 2012]

HDBaseT Boosts Home Consumer Electronic=20 Networking

(Power=20 Electronics Technology Via Acquire Media = NewsEdge) Many=20 IT managers will be happy about a new networking = technology that allows them to connect consumer=20 electronics (CE) equipment in their homes the = same way=20 they may connect industrial systems at work. = This=20 networking technology is HDBaseT, intended for=20 transmission of uncompressed high-definition = video,=20 audio, 100BaseT Ethernet, and various controls=20 throughout a home. This digital home networking = system=20 connects and networks CE devices such as set-top = boxes,=20 DVD players, Blu-ray Disc players, personal = computers,=20 video game consoles and AV receivers to = compatible=20 digital audio devices, computer monitors, and = digital=20 televisions. HDBaseT supports all TV and PC = video=20 formats, including standard, enhanced, = high-definition,=20 and 3D video.

A recent addition to the = original=20 specification is Power over HDBaseT, or PoH. = This=20 enables the transfer of DC power, along with = data=20 signals, over a single Ethernet cable in a = manner=20 similar to Power over Ethernet (PoE). In fact, = PoH is=20 based on the IEEE 802.3at standard with = appropriate=20 modifications that enable safe delivery of up to = 100 W=20 over the four-pairs of Ethernet cable. PoH = defines the=20 power source equipment (PSE) and the powered = device=20 (PD), as well as detection and protection = mechanisms=20 that ensure safe and reliable delivery of power = over the=20 HDBaseT network.

Sending power over the = same=20 Cat5e/Cat6 cable provides the option to forgo = plugging=20 devices into the wall for ac power, which allows = greater=20 mobility. Power over HDBaseT is = backwards-compatible=20 with existing Power over Ethernet (PoE) = technology and=20 Power over Ethernet Plus (PoE+) as specified in = the=20 IEEE802.3at-2009 standard.

Find Solutions for = Enterprises, SMBs=20 & Service Providers at The World=E2=80=99s = Communications=20 Conference, ITEXPO West. September 13-15, 2011 = Austin,=20 Texas

HDBaseT delivers different types of control = signals=20 with different purposes, starting from CEC that = operates=20 basic functionality such as power-on, power-off = and=20 play/stop, to RS-232/USB and IR that operate = remote=20 equipment even when it is located in a different = room.

This networking technology connects = home=20 entertainment systems and devices using a = feature called=20 5Play=E2=84=A2 that enables: Up to 10.2 Gbps of = uncompressed=20 videoAudio100BaseT EthernetControl signalsDC = powerThey=20 all share the same cable, across distances up to = 100m=20 using standard RJ-45 connectors (Fig. = 1).

HDBaseT=20 can support up to eight, 100m cable hops. Also, = it can=20 double the resolution of today=E2=80=99s video = content, features=20 required for 3D integration and future 2K and 4K = formats. Unlike other technologies that require = a=20 specific cable or a new, proprietary connector, = HDBaseT=20 uses the existing Cat5e/6 = infrastructure.

The=20 RJ45 connector works with both HDBaseT and = Ethernet.=20 Instead of having three connectors=20 (AC+Ethernet/RJ45+HDMI) that you find in many = TV=E2=80=99s=20 today, you will move to only one connector=20 (HDBaseT/RJ45). Short circuit protection for the = DC=20 input already exists inside the PoH (and PoE) = PSEs as=20 part of their standard.

HDBaseT power=20 capabilities also solve the problem = manufacturers have=20 faced with providing thinner, lighter = wall-mounted TVs=20 that have been encumbered by complicated = companion=20 AC-to-DC and DC-to-DC-circuitry with a single,=20 convenient DC-to-DC power circuitry. HDBaseT = replaces=20 this AC-cable/connector so that, for instance, = wall-hung=20 TVs connected via an HDBaseT-enabled Cat5e/6 = cable will=20 require no other power source.

While = defined with=20 the consumer market in mind, PoH will most = likely be=20 extremely useful in applications in which the TV = or=20 display signage monitor is located in = hard-to-reach=20 places, such as hospital bedrooms, public dining = areas,=20 transportation locations, etc.

Powering=20 capabilities are increasingly important as more=20 electronic devices enter the home. This = technology has=20 enough headroom to power the vast majority of = these=20 products. For instance, today=E2=80=99s typical = 40-inch LED TV=20 consumes 70W and, beginning in September 2011, = the=20 latest Energy Star=E2=84=A2 5.3 specifications = will restrict all=20 TVs to 108W, regardless of screen size, with = 40-inch and=20 smaller TV=E2=80=99s consuming under = 75W.

Energy Star 6.0=20 is targeting a cap of 85W for all screen sizes = from=20 mid-2012. LCD and LED TV monitors are rapidly=20 approaching an average of approximately one watt = per=20 inch of screen size. At these levels, HDBaseT = has ample=20 power delivery capabilities, even for supporting = very=20 large displays.

Additionally, = HDBaseT=E2=80=99s=20 power-delivery technology provides the = foundation for=20 new opportunities to manage overall power = consumption=20 and efficiency. These capabilities are enabled = by the=20 underlying PoE technology that has become a = critical=20 element of the latest PoH = specification.

PoE=20 Power, Efficiency The original, low power = IEEE802.3af=20 standard used two out of the four pairs of wires = existing in a Cat5e cable, while the more recent = IEEE802.3at-2009, or PoE+ specification, allows = power to=20 be delivered over all four pairs. These latest = PoE=20 specifications also add mechanisms for device = detection,=20 classification, disconnection and protection = from=20 overload/short conditions, while also adding = many new=20 advanced, smart energy-management=20 capabilities.

In a typical PoH = implementation,=20 the PSE is installed and powered by a 50 to 57 = VDC power=20 supply, and all PDs then receive power directly = over the=20 HDBaseT link across all four pairs of = Cat5-or-better=20 cables. Four-pair powering is the key to = delivering more=20 power with greater efficiency. Defined in the = latest=20 high-power PoE standards, four-pair powering = gives PDs=20 two power interfaces so they can receive twice = the power=20 of earlier two-pair solutions by using all four = pairs of=20 Ethernet cable (Fig. 2). Nothing precludes the = two power=20 interfaces to be connected-one over the two = pairs using=20 lines 1, 2, 3 and 6, and the other using the two = pairs=20 that use lines 4, 5, 7 and 8.

This is = what makes=20 it possible to increase power delivery while = fully=20 complying with the = standard.

Additionally, core=20 PoE technology has been enhanced for the PoH=20 specification to include a higher current of = almost 1 A=20 for every two pairs, with an appropriate = three-event=20 classification that identifies PoH PSEs. This = enables=20 PoH technology to transfer of up to 100W of = continuous=20 DC power, per port, from one side of the HDBaseT = link to=20 the other. Unlike in PoE, where the PD must = assume a=20 worst-case cabling infrastructure at all times, = PoH=20 enables the PD to identify the cable = length/resistance=20 and draw more power, as long as the overall = power=20 consumption does not exceed 100W. PoH is fully=20 backwards-compatible with the IEEE802.3at-2009 = PoE=20 specification, including the section 33.7.1 = mandate that=20 all PSEs conform to IEC 60950-1:2001 and be (VA) = per=20 port classified as a Limited Power Source (LPS) = carrying=20 no more than 100 W without the need for special=20 over-current protection devices. PoH also does = not=20 infringe on any of the mandated PoE safety=20 requirements.

To further support PoH = solutions,=20 PoE-enabled equipment called midspans have = become a=20 popular option for commercial applications such = as=20 display signage, in which a single 24-port PoH = midspan=20 can be used to power 24 PoH capable displays. = Network=20 administrators use midspans that feature remote = PD=20 monitoring and configuration capabilities to=20 significantly reduce power consumption system=20 wide.

They can monitor per-port and total = power=20 consumption, and configure their PDs for instant = and=20 scheduled ON-OFF functions on a port-by-port = basis. The=20 major advantage of adding PoH (or PoE) to a = network via=20 Midspans, instead of PoE switches, is that the = Midspan=20 creates virtually no disruption to the network: = no=20 re-configuration of switches or VLANs is=20 necessary.

Although developed as a = point-to-point=20 technology for the home, HDBaseT also allows = cascading=20 and single point-to-multipoint distribution = supporting=20 both daisy chain and star topologies. Its = flexibility=20 makes HDBaseT as an ideal commercial = connectivity=20 technology for applications such as digital = signage. For=20 example, an airport installation with multiple = displays=20 are spread throughout the terminal. Using LAN = cables=20 with daisy chain and star topologies allows = distribution=20 of departure and arrival = data.

Controlling the=20 entire HDBaseT-enabled system can also be done = easily=20 using Ethernet or RS-232 when=20 applicable.

Connecting devices within a = large=20 suite or accommodating a large conference within = a=20 hotel, the existing Ethernet infrastructure = allows an=20 HDBaseT network to be easily implemented. Using = HDBaseT,=20 professional installers can network displays and = devices=20 throughout hotel suites, lobbies and conference = rooms to=20 create a unified viewing experience for guests. = With all=20 devices located in a separate space 100 meters = away,=20 flat screen displays can be easily mounted, = allowing for=20 additional traffic area, less cable clutter, and = a more=20 aesthetically pleasing space.

HDBaseT = technology,=20 with its support for daisy chain and star = topology=20 networking, is ideal for various camera = applications=20 that require a reliable solution with the = highest video=20 quality and real-time performance, at a minimal=20 installation cost.

For instance, = installing=20 multiple surveillance cameras spread over a = large=20 outdoor area usually requires long distances and = resistance to extreme environmental conditions. = With=20 HDBaseT enabled cameras, installers now have a=20 long-reach, reliable, single-wire camera=20 connection.

Related Articles High-Power = PoE=20 Technology Evolves PoE Offerings Address = High-Power and=20 Wireless Applications High-Performance, = Monolithic Quad=20 PSE Controller Enables IEEE 802.3at (PoE+) = Applications=20 Isolated 12-Port Power over Ethernet PSE = Controller=20 Chipset =C2=A9 2012 Penton Media =

[ Back To = TMCnet.com's=20 Homepage=20 = ]

Bookmark mobile.TMCnet.com=20 on your mobile phone now to stay on top of the latest = tech=20 news.

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