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1、 CEA Standard CEBUS-EIB Routers Communications Protocol- Description of the CEBUS-EIB Router CEA-776.1 February 1999 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:02:11 MDTNo reprod
2、uction or networking permitted without license from IHS -,-,- NOTICE 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 prod
3、ucts, and 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
4、not conforming 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.
5、Standards, 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 Standa
6、rd, Bulletin 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 mad
7、e. This Standard 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
8、before its use. (From Project Number 4565, formulated under the cognizance of the CEA R7 Home Networks Committee.) Published by CONSUMER ELECTRONICS ASSOCIATION 2002 Technology otherwise, the packet is blocked. 4.2 ID Packets. 4.2.1 Requesting ID Packets. An ID packet is the means by which a node (o
9、r group of nodes) makes itself known to CEBus routers that employ Directory Routing. CEBus-EIB Routers do not contain dynamic Directory Routing Tables, so do not use the information provided by ID packets. Also, CEBus-EIB Routers do not request that ID packets be returned from nodes that are recipie
10、nts of packets passing through the CEBus-EIB Router. However, for consistency with a CEBus network, CEBus-EIB Routers respond to a Request ID destined for an EIB node. 4.2.2 ID Packets from a CEBus-EIB Router Since EIB nodes do not process NPDUs with a routing type of “Request_ID,” the CEBus-EIB Rou
11、ter will respond with an ID packet if it receives a CEBus packet containing this request destined for an EIB node. The ID packet contains the Destination Address 00FE indicating that the destination is “nonlocal.” 4.3 Output of Router A Router generates packets and retransmits received packets accor
12、ding to various entities within the router. As packets complete processing in the Router Network Layer, they are added to the forwarding queues within the router. All packets contain a priority field in the NPDU. This field prioritizes packets waiting to be passed to the Data Link Layer. This priori
13、ty queuing scheme ensures that High priority packets are transmitted before packets of Standard or Deferred priority from the router. The size of these priority queues is limited to specific lengths defined in the technical specification document. These limits have been set to improve performance of
14、 the router. Although the Network Layer sends the highest priority packet available to the Data Link Layer, before the DLL can pass that packet to the Physical Layer, a higher priority packet could arrive at the network layer. In this situation, the Network Layer immediately passes the packet to the
15、 Data Link Layer. The DLL can perform priority preemption on the first packet. The DLL returns a FAILURE_PRIORITY packet to the Network Layer for the first packet. The Network Layer returns this packet to the proper forwarding queue and will send the packet to the DLL again at the proper time. -11-
16、Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:02:11 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA-776.1 CEBUS-EIB ROUTER COMMUNICATIONS PROTOCOL DESC
17、RIPTION OF THE CEBUS-EIB ROUTER 5. Summary A CEBus-EIB Router is the device in a combined CEBus-EIB network that connects an EIB and a CEBus medium. A router forwards packets onto the adjacent medium and convert packets between CEBus and EIB Data Link Layer formats, with an optional translation of t
18、he information field. These functions are provided though the interaction of three logical elements: the Communications Element, the Forwarding Element, and the Directory Routing Table Element. 12 Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employee
19、s/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:02:11 MDTNo reproduction or networking permitted without license from IHS -,-,- CEA Document Improvement Proposal If in the review or use of this document, a potential change is made evident for safety, health or technical reasons, please
20、 fill in the appropriate information below and email, mail or fax to: Consumer Electronics Association Technology & Standards Department 2500 Wilson Blvd. Arlington, VA 22201 FAX: 703 907-7693 standardsce.org Document No. Document Title: Submitters Name: Telephone No.: Submitters Company: FAX No.: e
21、-mail: Address: Urgency of Change: Immediate: At next revision: Problem Area: a. Clause Number and/or Drawing: b. Recommended Changes: c. Reason/Rationale for Recommendation: Additional Remarks: Signature: Date: FOR CEA USE ONLY Responsible Committee: Chairman: Date comments forwarded to Committee C
22、hairman: Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:02:11 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Consumer Electronics Association Pro
23、vided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:02:11 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employ
24、ees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:02:11 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright Consumer Electronics Association Provided by IHS under license with CEA Licensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/30/2007 21:02:11 MDTNo reproduction or networking permitted without license from IHS -,-,-