Category: Network Architecture
Applicability: Applies to all state agencies, boards, commissions, state funded entities, and entities using state-owned or state-leased communication networks for synchronous video
History: Adopted on September 9, 2004.
|Video Protocol Standard||Comments|
|H.263||For data rates above 384 Kbps|
|H.264 (MPEG-4 Part 10)||For data rates at or below 384 Kbps|
The CODECs selected for purchase or use should be capable of accommodating both standards and be capable of manual rate selection and/or automatic rate selection. The interconnecting CODECs should be allowed to automatically negotiate the best data rate.
|Audio Protocol Standard||Comments|
|G.722||For data rates above 128 Kbps|
|G.722 or G.722.1 or G.728||For data rates at or below 128 Kbps|
The CODECs selected for purchase or use should have the ability to use G.722 at all speeds and one or both of the other two standards listed for lower speeds. If any two CODECs do not have a common protocol at or below 128Kbps then they should continue to use G.722. The CODECs selected for purchase or use should be capable of accommodating audio standard G.722 and be capable of manual rate selection and/or automatic rate selection. The interconnecting CODECs should be allowed to automatically negotiate the best data rate.
The purpose of this document is to establish video and audio protocol standards that will enable all existing and future synchronous distance learning and videoconferencing facilities in Nebraska to achieve interoperability and maintain an acceptable quality of service.
Bandwidth: In digital applications, this term refers to the speed at which data is transmitted. It is usually expressed in terms of bits per second. It is often used interchangeably with the term data rate.
CODEC: Stands for Encoder / Decoder or Coder / Decoder. This device changes outbound analog video and audio into data and inbound data into analog video and audio. It is a device that attaches directly to the video and audio source.
Data Rate: This is the amount of digital information that a system can process and/or transmit. It is usually expressed in terms of bits per second. It is often used interchangeably with the term bandwidth.
Distance Learning: Distance learning is the delivery of educational experiences where the instructor(s) and student(s) are indifferent locations and engaging in learning at the same time (synchronously) or at different times (asynchronously). Synchronous distance learning typically involves 2-way interactive video delivered to two or more classrooms
G.7xx: A family of audio protocols with varying specifications as developed by the ITU. Examples include:
|Standard||Required Bandwidth||Frequency Response|
|50Hz - 3.4KHz||50Hz - 7KHz||50Hz - 3.4KHz|
Gateway: As used in this document, this term refers to a device or system that allows a system using one protocol standard to communicate with a system using a different protocol standard.
H.2xx: A family of video protocols with varying specifications as developed by the ITU. Examples include H.261 and H.263. They are differentiated by the specific algorithms used to encode and decode video.
H.3xx: A family of communications protocols with varying specifications as developed by the ITU. Each of these protocols have multiple options of video, audio and data protocols defined within them. Examples include:
H.320 for transportation on an ISDN network
H.321 for transportation on an ATM network
H.323 for transportation on an IP network
ITU: International Telecommunication Union, headquartered in Geneva, Switzerland is an international organization within the United Nations System where governments and the private sector coordinate global telecom networks and services.
Mbps: Megabits Per Second – Millions of bits per second.
MPEG: Motion Picture Experts Group – A body that defines protocols for digitally encoding video and audio. Some of the protocols defined by this group include:
MPEG 1 – Designed to compress the data required to pass analog video and audio.
MPEG 2 – An improvement in efficiency over the algorithms of MPEG 1
MPEG 4 – Designed to incorporate voice, video and data as objects that can be transported interchangeably.
These standards apply to synchronous distance learning and videoconferencing facilities as follows:
If utilizing state-owned or state-leased communications networks:
If using state funding:
These standards do not apply to the following entities:
General Statement on Applicability: The Governing board or chief administrative officer of each organization is responsible for compliance with these standards. The NITC will consider adherence to technical standards as part of its evaluation and prioritization of funding requests
An effective program for video and audio standards compliance involves cooperation of many different entities. Major participants and their responsibilities include:
The NITC provides strategic direction for state agencies and educational institutions in the area of information technology. The NITC also has statutory responsibility to adopt minimum technical standards and guidelines for acceptable and cost-effective use of information technology. Implicit in these requirements is the responsibility to promote adequate quality of service and uniformity for information systems th rough adoption of policies, standards, and guidelines.
The NITC Technical Panel, with advice from the Video Standards Work Group, has responsibility for recommending video standard policies and guidelines and making available best practices to operational entities.
The highest authority within an agency or institution is responsible for interoperability of information resources that are consistent with this policy. The authority may delegate this responsibility but delegation does not remove the accountability.
Technical staff must be aware of the opportunities and responsibility to meet the goals of interoperability of information systems.