IBM SG24-4817-00 manual Video Distribution Module, Mpeg Fundamentals

This soft copy for use by IBM employees only.

4.6 Video Distribution Module

The Video Distribution Module is a double-slot video concentrator module that can be used to provide low-cost, high-quality, video distribution to standard TV monitors. It has the following characteristics:

•Eight independently addressable MPEG-2 decoder ports. Each port can support an MPEG-2 video stream encoded at data rates of 1.5-15 Mbps simultaneously.

•Eight separate audio and video output connections:

−Video: composite baseband NTSC (EIA Standard RS-170A) or PAL (in Release 1.1):

-Video Resolutions:

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SIF: 352x240 pixels (NTSC)

HHR or Half-D1: 352x480 pixels (NTSC)

CCIR-601 or Broadcast: 704x480 pixels (NTSC)

Comparable PAL resolutions

−Audio: stereo, balanced or unbalanced

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Supports MPEG-2 Main Level, Main Profile (4:2:0) video and MPEG-1 audio.

Supports MPEG-2 Elementary Stream or MPEG-1 Elementary Stream encapsulated in an MPEG-2 Transport Stream at speeds of up to 15 Mbps.

•Supports a Single Program Transport Stream (that is, one video and one audio program).

•Supports Closed Caption data and Extended Data Services information in accordance with EIA 608: Recommended Practice for Line 21.

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Supports ATM for PVC and SVC Connections using UNI 3.1.

Can receive video input from any ATM device that can access the 8285 switch via the the ATM network.

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Supports frame synchronization using GENLOCK inputs.

Functions as an H.310 AAL-5 Receive-Only Terminal (ROT). H.310 is an ITU standard for broadcast-quality audiovisual communication over broadband networks using MPEG-2 video over high-speed ATM networks. The standard includes subparts such as:

−H.262 (MPEG-2 video standard)

−H.222.0 (MPEG-2 Program and Transport Stream)

−H.222.1 (MPEG-2 streams over ATM)

−Various audio compression standards

•Can be monitored, but not configured via the 8285 ATM Control Point.

4.6.1MPEG Fundamentals

MPEG-2 is an International Telecommunication Union (ITU) standard for digitizing, compressing, and multiplexing video and audio information. The predecessor to MPEG-2 is MPEG-1, which is widely used in low-end video and PC software-based encoding and decoding environments. MPEG-1 is a desktop

48ATM Workgroup Solutions: Implementing the 8285 ATM Switch