Media Links
MD-6000 Video Transport System
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The MD-6000 is a video transport system that enables long haul transport of high quality uncompressed video signals over SDH / SONET (OC-48 / STM-16 and OC-192 / STM-64) networks. By interfacing directly to a telco network, The MD6000 simplifies network configuration by eliminating the need for codec equipment required by alternative video transport systems. The system utilizes multi-format video modules that accept uncompressed HD and SD video signals, as well as DVB-ASI and SDTI signals. An optional board combines a STM-1 (155Mbps) and a DVB ASI (Max 90Mbps) input signal and transports a 270Mbps payload to a 2.5G or 10G network interface card. Redundant interface cards can be configured to enable hitless switching to a protection circuit in the event of a circuit failure. The MD6000 also features automatic error detection and correction and centralized SNMP management software.
| Functions * Uncompressed Video Transport * Hitless Fiber Path Protection * IP Encapsulation * Bi-directional Functionality * Automatic Error Detection * Reed Solomon Error Correction * Interleaving * Minimal End to End Delay |
Features: * Modular Architecture * Modular Rear Panel I/O * Carrier Class Redundancy * Hot Swappable Modules * SNMP Management * Hot Swappable Common Equipment |
Video Interface Module - One card handles all types of serial digital video, including SD-SDI, DVB/ASI, SDTI and HDSDI. Each card is bi-directional, capable of simultaneously sending and receiving any signal type (even different types in each direction).
STM-1 + Video Module - This multifunction card carries a full bandwidth, bidirectional OC-3/STM-1 plus a 90 Mbit/sec DVB/ASI signal in each direction. This card can support all major types of 155 Mbit/sec signals, including ATM, IP, voice, compressed video, and audio.
HD-DPCM - This module accepts HD-SDI and utilizes high quality DPCM compression to reduce the signal rate to approximately 1Gbps which allows 2 HD-SDI signals and 1 SDI signal to be transported on an OC-48/STM-16.
SD-DPCM - Utilizes ITU J.81 DPCM compression to accept 2 SDI signals and carry them in half of the bandwidth providing twice the signal carrying capacity.
Ethernet User Interface Module - The MD6000 Ethernet User Interface Module includes three 10/100BT Ethernet ports and one 10BT port. Four RJ45 connectors are located on the rear connector module. The MD6000 provides full bandwidth, full duplex point to point Ethernet connections between shelves.
Network Interface Modules - The heart of the MD6000 system, these cards generate the high-speed output signals for a shelf full of video and data interfaces. One IPSW is enough to run the entire shelf; two are required for hitless protection switching over a redundant network. Two versions are available: the 2.4G model for STM-16/OC-48 networks, and the 10G model for STM-64/OC-192 networks.
System Management - All top-quality networking hardware needs to support performance monitoring and fault isolation. The MD6000 offers three different management interfaces:
* A built-in web-server works with a user’s normal web browser to
give
complete system status in an easy-to-read graphical layout. This server
also provides a graphical user interface that simplifies system installation
and configuration.
* A detailed SNMP MIB is provided on each IP Switch to report critical
system
operational status in a machine readable form, allowing integration into
popular
software packages.
* Hard-contact relays are provided for local alarming and in case of a
complete
input power failure.
MD6000 systems work best for even the most challenging video transport applications: live transport of uncompressed video signals. Sports broadcasting is, of course, a major use for live video. Other applications include high-quality news and live entertainment. Plus, as many broadcasters have discovered, utilizing uncompressed video links is the best and easiest way to transport content from one location to another, even for pre-recorded content. The technology used in the MD6000 has a history of successfully satisfying even the most demanding users.
Uncompressed Video is the best format available for live video transport.
It avoids all of the problems that result from compressed video, including:
* Delays in both the encoding and decoding process.
* Hidden artifacts in the video image caused by compression.
* Painstaking process to match encoding parameters to video/audio/data
signal source with uncompressed video, it’s just “connect and
go” regardless
of the video format and frame rate - 1080i, 720p, 525/625 line, 50, 60 or
59.94 Hz,
plus all types of embedded audio and data.
IP Encapsulation is key to the performance of the MD6000. Every incoming signal is divided into standard IP packets before being transmitted. This benefits users in several ways:
* Forward Error Correction can be applied to each packet, eliminating
the few
inevitable bit errors that occur on fiber optic links.
* Packet sequence numbers allow rapid, automatic detection of lost or
delayed
packets, which can be corrected with hitless switchover.
* Smooth migration path from traditional SONET/SDH networks to IP core
networks can be easily accomplished through an available software upgrade
to support PPP protocol or to support Media Links Video Routers.
Hitless Protection Switching ensures delivery of pure, uninterrupted video signals even if the underlying SONET/SDH or IP network suffers a momentary outage or a 50 msec protection switch. By using redundant paths, and performing a packet by-packet comparison of the incoming signals, the MD6000 can prevent minor or major network faults from impacting valuable video signals.
Differential Delay Adaptation allows Hitless Switching
to work by automatically compensating for any differences in the signal
transit times on the primary and secondary network links. To the user, this
unique technology means that each signal interface can continue to provide
clean, uninterrupted service even if either the primary or the secondary
network is interrupted.