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Harris NetVx: Video broadcast Solutions

A television station wants to distribute Standard Definition (SD) and High Definition (HD) programming from its main studio to its transmitter. The station has established requirements to meet its programming and operational needs. Configurations of one to four SD and one HD signal will be sent to their transmitter location. They will backhaul a satellite and off-air confidence monitoring feed from the transmitter site. Finally, to help reduce operating expenses and enhance facility monitoring / security, the station will tunnel data services into the video stream, such as remote control status, security, local area networking, and telephone extensions. Harris NetVX is an ideal signal interface and management platform for this application and it complements and enhances the features found in TRuepoint microwave digital radios from Harris Microwave Division. Together, NetVX and TRuepoint provide a total solution for both traditional analog and digital TV. The television station‘s main control studio can provide either baseband video or a Multiple Program Transport Stream (MPTS) via an ASI port. The TV station can use NetVX to connect to the remote studios and transmitter site(s) in variations of direct, ring, and sequential point-to-point communication topologies, via fiber, Telecom or digital microwave. The connection facilities can be public or private, simplex or bi-directional digital microwave, dark fiber or IP. NetVX‘s modular shelf design allows a station operator to select from DS3/E3, OC-3/STM-1, or IP connectivity, and even network over multiple interfaces simultaneously. All of this can be done on a scale that accommodates a wide variety of services. In the application described here, the TRuepoint radio is used to provide bi-directional DS3/E3 connectivity at both the studio and transmitter sites in the microwave frequency bands from 6 to 38 GHz. At the main control studio, the NetVX chassis in this example is equipped with a multiplexer module to accept the encoded SD and HD signals from the Harris Flexicoder or other encoding device. Alternatively, two variations of the NetVX SD encoder or the HD encoder modules may be installed in the chassis to process video into the transport stream. The ATSC Program & System Information Protocol (PSIP) can be created by an external generator and connected to the Flexicoder or NetVX via the ASI or Ethernet/IP port. The NetVX ATM network modules are used to distribute the transport streams to the remote sites-for example, via the TRuepoint radio‘s DS3/OC3 connectivity or by Telecom Fiber lines. Decoder modules can also be installed at this site to view video backhaul, such as off-air confidence monitoring or satellite feeds. Transmitter Remote Control and Element Management tools take advantage of NetVX‘s and TRuepoint‘s bidirectional built-in IP services. Vidiem and ReCon systems simply plug into Ethernet ports via hub or switch, consolidating the entire system design into one manageable arrangement, where all cabling and cross-connects are internally and automatically configured. NetVX interfaces to the frequency-independent TRuepoint signal processing unit (SPU), a rack-mount
transceiver, via ATM DS3/E3. Each SPU then connects to the radio frequency unit RFU), which can be installed outdoors near the antenna. TRuepoint has many software-enabled features, allowing user-selectable data capacities and other custom configuration parameters, so that TRuepoint can meet local regulatory and spectrum requirements. TRuepoint RFU and SPU units deployed at the remote transmitter site connect to the NetVX chassis via the DS3/E3 connection. NetVX then receives the HD, SD, PSIP, and IP signals on the ATM network module interface & places these on the NetVX bus. Signals continuing on to additional sites are “copied” to the appropriate ATM network module transmit ports for forwarding to the next site. Signals destined for the local broadcast site are directed to either a TMX module SMPTE 310 port to drive a local Digital TV transmitter or to a decoder module to drive the local NTSC transmitter. All LAN and data connections are made through the NetVX Gig-E or 10/100 Ethernet ports to the local network. Two key design requirements ensure reliable performance for this type of transport network. The first is to keep the payload of the interconnecting facilities within the bandwidth limitations of the assuredcommunications™
NetVX™ Application Note NetVX™ And TRuepoint Video Studio-To-Transmitter Link Intelligent Connectivity Solutions assuredcommunications™ pipe. A typical DS3 transport pipe, for example, has 38 or 39 Mbps usable bandwidth. In this example, we will assume a DTV stream of 19.4 Mbps plus a 2 Mbps stream for IP and LAN traffic being transmitted from the studio. This total of 21.4 Mbps will be within the limitations of the DS3 connection and provide room for growth and/or backhaul of services from the remote site. The second key design requirement is redundancy and fail-over planning. NetVX and TRuepoint have many features that make this process easy and comprehensive. NetVX features include V-LAN, Forward Error Correction, automatic configuring of cross-connects, and Leitch router control protocol. Both NetVX and TRuepoint offer configurations with automatic switchover, hot-swap modules, and power supplies. As a result, NetVX and Truepoint offer carrier-level reliability to keep mission-critical networks online and operating efficiently, and protect the video signal and the station‘s income stream. NetVX and TRuepoint have a variety of user-selectable features that facilitate remote site management efficiently and economically: Powerful management tools: Both NetVX and TRuepoint support SNMP element managers and monitoring, with built-in diagnostics and status that can be collected and assessed. These signals are forwarded to the studio over the NetVX Ethernet/IP port. This solution is also designed to maintain signal headroom and to prevent over-subscription of the payload of the interconnecting transport facilities. Simplex or bi-directional operation: The traditional STL or TSL operates in simplex mode, which is available with TRuepoint as an option. Bi-directional transport, TRuepoint‘s more typical configuration, allows TV station operators to use the return path for remote newsgathering, live feeds, video file transfer, and IP networking. Efficient bandwidth management: NetVX optimizes your live stream capacity by managing the available transport stream, assigning more bandwidth to live or high-priority feeds, while reducing bandwidth for lower priority feeds. When additional bandwidth is available for the lower priority feeds, NetVX automatically uses it for those streams until higher priority streams need the bandwidth again. A prerequisite is to design and manage the transport bandwidth accordingly. This solution provides the integrated tools required to quickly identify transmission path health and network performance down to the packet and cell count level. The Harris Video Networking and Microwave Solution – using NetVX and Truepoint – is a complete solution capable of integrating the appropriate modules to meet both your current and future network design requirements. For more information, or for a demonstration, please contact your Harris representative. Harris has technical assistance to facilitate your video network planning and is prepared to help you benefit from a wide range of integrated digital technologies.

For more information, visit www.broadcast.harris.com.

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