CEA-851.1-2002.pdf
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1、 CEA Standard IP-Based Digital Telephony for the Versatile Home Network CEA-851.1 December 2002 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:15:34 MDTNo reproduction or networking permitted without licen
2、se from IHS -,-,- NOTICE Consumer Electronics Association (CEA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and
3、 assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications shall not in any respect preclude any member or nonmember of CEA from manufacturing or selling products not confo
4、rming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications preclude their voluntary use by those other than CEA members, whether the standard is to be used either domestically or internationally. Standards
5、, Bulletins and other technical publications are adopted by CEA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, CEA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulle
6、tin or other technical publication. This CEA Standard is considered to have International Standardization implication, but the International Electrotechnical Commission activity has not progressed to the point where a valid comparison between the CEA Standard and the IEC document can be made. This S
7、tandard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before it
8、s use. (Formulated under the cognizance of the CEAs R7 Home Network Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2002 Technology however, we leave discussion of implementing non-IP telephony on the VHN to a later version of this Standard. We note first that, as the VHN is an IP-based in
9、ternet, it is capable of transporting any IP traffic, regardless of the interpretation of the packet contents. Thus, IP-based telephony transport is “native” to the VHN, and the VHN is transparent to the transport of “telephony” packets. However, as with other services that may be provided using the
10、 VHN, control signals for IP telephony require some attention. In addition, as telephony usually implies connectivity to a public telephone network outside the home, it will be necessary for the IP telephony end device (which may not be a traditional telephone set) to have a logical interface with s
11、oftware that will probably reside on an access-backbone interface or an access-component interface, such as a Residential Gateway or a cable modem. While it is beyond the scope of this Standard to specify the architecture or operation of these devices, we feel it is important to require the presence
12、 of certain software on the access interfaces. Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:15:34 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-851.1 3 2. GENERAL 2.1 Scop
13、e This standard addresses IP-based digital telephony (sometimes referred to as “Voice over IP”) on the VHN. As the VHN is inherently digital, it does not address analog telephony; nor does it address non-packet digital telephony, such as the streaming service provided by ISDN. However, future versio
14、ns of this standard may address non- IP telephony. Although this Standard has been issued as a separate document, it is an integral part of EIA/CEA-851, “VHN Home Network Specification.” Requirements and specifications in EIA/CEA-851 also implicitly apply to the functions and devices described in th
15、is Standard, unless there specifically stated otherwise. Also, note that this Standard defines the requirements for implementing a telephony function on a VHN. As such, it is not a device description. Any VHN device that implements telephony is also expected to implement all other parts of EIA/CEA-8
16、51 that are applicable and appropriate for such a device. For example, EIA/CEA-851 requires that a VHN device support a web server; thus, any device implementing the telephony function, as described in this Standard, would be expected to include a web server that would conform to the requirements in
17、 EIA/CEA-851. 2.2 Normative references The following standards contain provisions that, through reference in this text, constitute normative provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements ba
18、sed on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed in Sec. 2.2.1. If the referenced standard is dated, the reader is advised to use the version specified. 2.2.1 Normative reference list: 1. EIA/CEA-851, “VHN Home Network Sp
19、ecification,” October 2000. 2. IETF RFC 2543, “SIP: Session Initiation Protocol” 2.1.1 Normative reference acquisition: EIA standards may be ordered from Global Engineering Documents, http:/ IETF RFCs may be downloaded from http:/www.rfc-editor.org/. 2.2 Informative References The following document
20、s contain information that is useful in understanding this standard. Some of these documents are drafts of standards that may become normative references in a future release of this standard. Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=Boeing Co/5910770
21、001 Not for Resale, 07/25/2008 03:15:34 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-851.1 4 2.2.1 Informative document list: 3. ITU-T Recommendation H.323, “Packet-based multimedia communication systems” 4. IETF RFC 1889, “RTP: A Transport Protocol for Real-Time App
22、lications” 2.2.2 Informative document acquisition: ITU-T International Telecommunications Union, Place des Nations, CH-1211 Geneva 20, Switzerland; Phone +41 22 730 5111; Fax +41 22 733 7256; Internet http:/www.itu.ch/publications/bookstore.html; Email itumailitu.int IETF IETF RFCs may be downloaded
23、 from http:/www.rfc-editor.org/. 2.3 Symbols and abbreviations IETF Internet Engineering Task Force ISDN Integrated Services Digital Network ITU International Telecommunications Union POTS Plain Old Telephone Service RTP Real-time Transport Protocol SIP Service Initiation Protocol SONET Synchronous
24、Optical Network VHN Versatile Home Network 2.4 Compliance Notation As used in this document, “shall” and “must” denote a mandatory provisions of the standard. “Should” denotes a provision that is recommended but not mandatory. “May” denotes a feature whose presence does not preclude compliance, that
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