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Hersteller: Accton Technology Dateigröße: 1.65 mb Dateiname: VS2512A_a.pdf Unterrichtssprache:

The VDSL connection delivers an Ethernet data link rated up to 15 Mbps symmetric (full duplex), while simultaneously supporting standard telephone services. The system can be deployed in any multi-dwelling/multi-tenant environment (apartment blocks, hotels, or office complex) to provide both high- speed Internet access and telephone services without any need for re-wiring. Accton’s VDSL Switch-VS2512A and VDSL-Splitter-VM2524/VM2548 combine both the data and phone signals coming from your Internet and telephone service providers, and pass these signals directly over standard telephone wiring to multiple users in the same building. A CPE is then used to separate these signals and pass them on to a customer’s computer and telephone equipment. In-building connections can operate up to 15 Mbps for runs up to 1070 m (3500 ft), 10 Mbps for runs up to 1220 m (4000 ft), 5 Mbps for runs up to 1525 m (5000 ft). Note: Category 3 cable must be installed to achieve the maximum distance, but the distance may be limited by factors such as how the cable is bundled, and the interference and noise on the link. The VDSL switch and splitter are typically located in a wiring closet or other central location of a multi-dwelling/multi-tenant unit, campus or enterprise. An Internet connection is provided from the ISP to the customer’s building over fiber optic cable, running Ethernet directly over a 100 Mbps or 1 Gbps connection. This kind of WAN connection is referred to as Fiber To The Building (FTTB). Phone signals are routed from PBX/MDF distribution equipment into the splitter. The data and phone signals for each user are combined in the splitter, and passed over VDSL lines to individual customers. The CPE at the other end of the VDSL line connects to any PC or Macintosh equipped with a 10/100BASE-TX network interface card. Your existing telephone, modem, or fax machine simply plugs into the CPE’s phone port. There is no need for special splitters, terminators or filters. In fact, there is no need to modify the home wiring at all. And, because the VDSL connection is based on Ethernet, no further complex software configuration is required. About the VDSL Switch-VS2512A 1-2 VDSL Technology VDSL (Very High Bit-Rate Digital Subscriber Line) is at the high-end of all the DSL technologies, offering the best combination of fiber optics and copper to provide high-speed broadband Internet access. VDSL’s primary application is in providing a broadband data service to multi-tenant residential or commercial buildings. In this implementation, fiber optic cable carries data from an Internet Service Provider to the building; then the installed telephone copper wires take the data and deliver it to individual units within that building. Figure 1-1. VDSL Application VDSL provides high-speed Internet access over existing phone lines by making use of previously unused frequency bandwidth above the voice band. By placing VDSL signals above the frequency of the voice signal, a VDSL service can coexist on the same line as other telephone services. VDSL can operate symmetrically, providing the same data rate in both directions, or asymmetrically, providing a higher data rate in the downstream (receive) direction than in the upstream (transmit) direction. VDSL can deliver high-performance online applications, such as high-quality video and other switched multimedia services. Accton's Ethernet-over-VDSL system provides robust performance, with a symmetric data rate up to 15 Mbps, and a range up to 1525 m (5000 ft). Accton’s system is based on advanced VDSL QAM (Quadrature Amplitude Modulation) technology with adaptive channel equalization that overcomes bridge taps and other line distortions. Reed-Solomon Forward Error Correction and interleaving protects against errors due to impulse noise and enables recovery from signal interruptions. Frequency Division Duplexing (FDD) separates downstream and upstream channels and allows VDSL signals to coexist with regular telephone services. A power back-off mechanism is also implemented to reduce noise from crosstalk in line bundles. ISP (Internet) Central Office (PSTN) Punch Down Blocks / Patch Panels PBX Telephone/Fax Telephone ES2002-TS VDSL CPE VDSL Splitter-VM2524 VDSL Switch-VS2512A Telephone Line from Central Office Fiber Optic Link to ISP Local Servers (Locally Hosted Services, Video Servers, Billing) Existing Phone Lines to Clients Multi-dwelling/Multi-tenant Building Floor 2 Floor 1 Rooms/Clients Rooms/Clients VDSL Lines LineLine VM2524 VDSLSplitter-VM2524VM2524 Phone Lines VM2512A-4FX-MTRJ-S 100BASE-FXSinglemodeModule ExpansionModule VDSLSwitch-VS2512A ResetReset PowerPower StackingStacking DiagDiag MasterMaster OnOn OffOff UpUpDownDown StackingStacking VS2512A ConsoleConsole 23456789101011111212 VDSLVDSL 1 ActivityActivity LinkLink ActivityActivity Link/SpeedLink/Speed 1234 EthernetEthernet 100-240V~50-60Hz1A ES2002-TS VDSL CPE Overview Switch Architecture The VDSL Switch-VS2512A employs a wire-spe...

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