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Topic: Subnetwork Attachment Point

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Logical link control

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	Definitions - ATM Terms
		Cell Transfer Delay: This is defined as the elapsed time between a cell exit event at the measurement point 1 (e.g., at the source UNI) and the corresponding cell entry event at measurement point 2 (e.g., the destination UNI) for a particular connection.
		Destination End Station: An ATM termination point which is the destination for ATM messages of a connection and is used as a reference point for ABR services.
		It is delineated by connection points at the boundary of the subnetwork.
	www.infocellar.com /networks/Definitions/atm-terms.htm (7742 words)

	Multiprotocol networking--a blueprint
		Subnetworking (as the term is used in the Open Blueprint) corresponds to those parts of the lower OSI layers that contain functions dealing with specific communications facilities, as well as frame- and packet-handling formats and dialing procedures.
		At the subnetworking layer, the technologies of data communications and telephony are converging on ATM to handle data, voice, and video communications.
		Control point services: Each switch is controlled by a node control point that exchanges information with every other switch so as to understand the network topology and the available bandwidth on every link, and to make routing decisions on behalf of the various access agents when they request end-to-end connections.
	www.research.ibm.com /journal/sj/343/hess.html (6686 words)

	ATM Glossary
		Since at this point on the link the transmitted signal is at maximum and the receive signal has been attenuated, it may be difficult to maintain an acceptable ACR with the received signal if the cable media allows large amounts of crosstalk leakage to occur.
		Point of Control and Observation: A place (point) within a testing environment where the occurrence of test events is to be controlled and observed as defined by the particular abstract test method used.
		Subnetwork Management System: A Network Management System that is managing one or more subnetworks and that is managed by one or more Network Management Systems.
	members.tripod.com /ATM_protocols/glossary.html (14697 words)

	Receive filtering for communication interface - Patent 6570884
		When the DSAP and SSAP are each equal to 0xAAh and the control field is equal to 0x03h, a subnetwork attachment point (SNAP) header follows the LLC header.
		To read the packet data, the ARM7 must determine where the start and end of the data is. The address of the first word of packet data for the packet at the top of the receive FIFO is contained in a pointer register associated with the FIFO.
		The end of the current packet is determined by reading another pointer register, which points to the first byte after the last valid byte in the packet at the top of the receive FIFO.
	www.freepatentsonline.com /6570884.html (8271 words)

	RFC 1483 - Multiprotocol Encapsulation over ATM Adaptation Layer 5
		LLC Encapsulation for Routed Protocols In LLC Encapsulation the protocol of the routed PDU is identified by prefixing the PDU by an IEEE 802.2 LLC header, which is possibly followed by an IEEE 802.1a SubNetwork Attachment Point (SNAP) header.
		Note that the Common PDU Header and Trailer of the encapsulated frame should not be simply copied to the outgoing 802.6 subnetwork because the encapsulated BEtag value may conflict with the previous BEtag value transmitted by that bridge.
		If the egress bridge has already begun transmitting segments of the PDU to an 802.6 subnetwork and then Heinanen [Page 9] RFC 1483 Multiprotocol over AAL5 July 1993 notices that the AAL5 CPCS-PDU has been aborted, it may immediately generate an EOM cell that causes the 802.6 PDU to be rejected at the receiving bridge.
	www.packetizer.com /rfc/rfc1483 (3075 words)

	www.ndc.nu The NDC Dictionary Page
		The points at which the ATM cell payload is passed to, or received from, the users of the ATM Layer (i.e., a higher layer or ATM-entity) for processing signify the endpoints of a VCC.
		Virtual Channel Link: A means of unidirectional transport of ATM cells between the point where a VCI value is assigned and the point where that value is translated or removed.
		Virtual Path Link: A means of unidirectional transport of ATM cells between the point where a VPI value is assigned and the point where that value is translated or removed.
	www.ndc.nu /svc6.php (16098 words)

	What is OSI Routing
		Broadcast subnetworks, such as Ethernet and IEEE 802.3, direct a single physical message to all nodes on the subnetwork.
		These hello messages primarily are intended to convey the subnetwork and network-layer addresses of the systems that generate them.
		If the destination address is an ES on another subnetwork in the same area, the IS will know the correct route and will forward the packet appropriately.
	www.pulsewan.com /data101/osi_routing_basics.htm (2016 words)

	Roxen Community: RFC 2684 Multiprotocol Encapsulation over ATM Adaptation Layer 5 (Standards Track) (Site not responding. Last check: 2007-10-19)
		The Common Protocol Data Unit (PDU) Header and Trailer are conveyed to allow pipelining at the egress bridge to an 802.6 subnetwork.
		If the egress bridge has already begun transmitting segments of the PDU to an 802.6 subnetwork and then notices that the AAL5 CPCS-PDU has been aborted, it may immediately generate an EOM cell that causes the 802.6 PDU to be rejected at the receiving bridge.
		A multicast address resolution server (MARS) is used possibly in conjunction with a multicast server to provide IP multicast behavior over ATM point-to-multipoint and/or point to point virtual connections.
	community.roxen.com /developers/idocs/rfc/rfc2684.html (4645 words)

	Data Networks, Local area networks
		The logical link control, subnetwork attachment point header starts with AA AA 03 (hex) and is followed by the organization/frame type fields.
		Because of the difficulty in bending the cable, transceivers which carried out the Manchester encoding and media-access control (CSMA/CD) are attached directly to the cable and the transceivers connect to the computer NIC's via an attachment unit interface (AUI) where address recognition, error detection and frame transfer is carried out.
		To make computer attachment easier, connection multiplexors can be used to connect many computers to a single transceiver.
	www2.hawaii.edu /~petermar/ics451/topic4.htm (2238 words)

	Cisco Catalyst 3900 Switch - Cisco Systems
		Both the Catalyst 3900 and 3920 offer a stack port (optional on the 3900, built-in on the 3920) which allows two units to be interconnected back-to-back, or up to eight units to be interconnected using the Catalyst 3020 Matrix Switch.
		As a result, enabling MAC address filtering on inbound ports and destination service access point (DSAP) and Subnetwork Attachment Point (SNAP) type filters on inbound and outbound ports has no effect on the media-rate performance of the switch.
		In addition, in configurations where SRT is used between ports or groups of ports, it is possible to control whether traffic is transparently bridged or source-route bridged on a per-protocol basis.
	www.cisco.com /en/US/products/hw/switches/ps651/ps653/index.html (930 words)

	SNAP - Sub-Network Access Protocol, SubNetwork Attachment Point, System and Network Administration Program
		SNAP - Sub-Network Access Protocol, SubNetwork Attachment Point, System and Network Administration Program
		Sub-Network Access Protocol is not the only word formed from SNAP.
		2) SNAP is also derived from SubNetwork Attachment Point
	www.auditmypc.com /acronym/SNAP.asp (138 words)

	TmP - Glossary
		The unique address maintained by a subnetwork for each of the DTEs attached to it.
		The functions of the lower half of the AAL layer that segment user traffic into 48-byte payloads and reassemble 48-byte payloads into user traffic.
		The point in the Intelligent Network(such as ISDN) where call control is handed off or transferred between the Service Switching Point and Service Control Point.
	www2.themanualpage.org /glossary/glo_s.php3 (2937 words)

	Interoperation of Controlled-Load Service and Guaranteed Service with ATM
		In ATM, a point to multipoint connection can be controlled by the source (or root) node, or a leaf initiated join (LIJ) feature in ATM may be used.
		If tagged cells are simply dropped at some point, regardless of load, then the operator may consider setting the break bit, at least for CLS service.
		The key points are that real-time timing is REQUIRED, that the data flow may have a variable rate, and that demotion of non-conforming traffic to best effort is REQUIRED to be in agreement with the definition of GS.
	xml.resource.org /public/rfc/html/rfc2381.html (11894 words)

	[No title]
		In LLC Encapsulation the protocol of the routed PDU is identified by prefixing the PDU by an IEEE 802.2 LLC header, which is possibly followed by an IEEE 802.1a SubNetwork Attachment Point (SNAP) header.
		Padding is added after the PID field if necessary in order to align the user information field of the bridged PDU at a four octet boundary.
		Note that in bridged 802.6 PDUs, there is only one choice for the PID value, since the presence of a CRC-32 is indicated by the CIB bit in the header of the MAC frame.
	library.n0i.net /rfc/html/rfc1483.html (2692 words)

	Mandragor & Apinc - Free Documentation Base
		LLC Encapsulation for Routed Protocols In LLC Encapsulation, the protocol type of routed PDUs MUST be identified by prefixing an IEEE 802.2 LLC header to each PDU.
		In some cases, the LLC header MUST be followed by an IEEE 802.1a SubNetwork Attachment Point (SNAP) header.
		+-------------------------------+ Since the 802.5 Access Control (AC) field has no significance outside the local 802.5 subnetwork, it is treated by this encapsulation as the last octet of the three octet PAD field.
	docs.mandragor.org /files/RFCs/26xx/2684 (4849 words)

	Asynchronous Transfer Mode
		For the IP switching subnetworks, the recommended network mask length is 30 bits.
		Depending on your network topology and the number and configuration of logical IP subnetworks (LISs) in your network, you might need to add static routes to other hosts if you want a connection to a host that is on another LIS subnet.
		For example, if you were configuring IP switching on Host A in Figure 4-3 and you wanted to route all traffic on all 16.1.1 networks through the IP switch, you would specify 16.1.1/24 as the destination address in Classless Inter-Domain Routing (CIDR) format and 16.1.1.6 as the gateway address.
	www.helsinki.fi /atk/unix/dec_manuals/DOC_51/HTML/ARH9CBTE/TMCNFGXX.HTM (4677 words)

	ATM, UNI, AAL
		This is sent first by the receiving end point and then by the switch.
		For a routed protocol the PDU has an 802.2 header, perhaps followed by a Subnetwork Attachment Point (SNAP) header (802.1a), and this header identifies that a routed protocol follows.
		A point to multipoint connection called the ServerControlVC connects the MCS to the MARS(s) and the MCS registers with the MARS with a MARS_MSERV message and unregister with a MARS_UNSERV message.
	www.rhyshaden.com /atm.htm (6307 words)

	Abstract (Site not responding. Last check: 2007-10-19)
		Research has shown that the ear is more sensitive to variations at low amplitude, so non-linear conversion charts (scales) have been defined which allow fewer bits to store the same range in amplitude by providing more points at the quieter end of the scale and fewer at the louder end.
		Eight bits allow for one sign bit (for amplitude greater than or less than "zero") and seven bits for the magnitude, which represents one of 128 possible points on a non-linear scale converting samples to amplitudes.
		If one connection is established on an end system, and another connection needs to be made, the vtx attempts to connect to the first number, but the server refuses the connection because it is already in use.
	www.ecs.csun.edu /~jkim/Project/Lowell/THESIS4.html (15539 words)

	InterOperability Laboratory: Services: Research: Research Archive: ATM: Knowledge Base
		The point where an outbound data flow exits the MPOA system.
		The MPS serving an Egress MPC for a particular outbound data flow.
		The MPS serving an Ingress MPC for a particular inbound data flow.
	www.iol.unh.edu /services/testing/atm/training/thesis/terms.php (485 words)

	IEEE 802.2 LLC (Site not responding. Last check: 2007-10-19)
		SNAP is the layer between the Network layer and the MAC layer.
		SNAP stands for SubNetwork Attachment Point and is part of the LLC 802.2 standard.
		The main usage for SNAP/LLC is in Apple Macintosh networks using the AppleTalk protocol.
	ckp.made-it.com /ieee8022.html (303 words)

	Tru64: atmsetup
		For LAN Emulation, you choose which emulated LAN to join and how to join the emulated LAN.
		For IP Switching, you specify the Subnetwork Attachment Point (SNAP) VCI number and VCI limits.
		In all three cases, you change only those default values that your configuration requires.
	nixdoc.net /man-pages/Tru64/man8/atmsetup.8.html (473 words)

	[No title]
		Abstract This document provides guidelines for mapping service classes, and traffic management features and parameters between Internet and ATM technologies.
		Garrett & Borden Standards Track [Page 10] RFC 2381 Interoperation of CLS and GS with ATM August 1998 The UBR category does not provide enough capability for Controlled Load.
		The CLR value may be uniform Garrett & Borden Standards Track [Page 20] RFC 2381 Interoperation of CLS and GS with ATM August 1998 over all egress points in the ATM network, or may differ, e.g., when wireless or satellite ATM links are in some paths.
	www.isi.edu /in-notes/rfc2381.txt (11783 words)

	Cisco - ATM PVC, SVC, Soft-PVC, and PVP Frequently Asked Questions
		In most cases, the differences refer to the LLC Encapsulation SubNetwork Attachment Point (SNAP) PVCs.
		PVPs are used as multiplexing/de-multiplexing points on ATM switches for VCs (Virtual Circuits) from various end devices.
		Refer to Configuring SVCs, PVCs, Soft PVCs, PVPs, and VP Tunnels for more information.
	www.cisco.com /warp/public/121/pvcfaq_23520.html (3778 words)

	Glossary... O - Free Computer Science Tutorials - Provided by Laynetworks.com
		An open organisation operating harmonised conformance testing services for OSI OSI telecommunications and IT protocols.
		A software company offering the Guide Guide hypertext hypertext system.
		An alias that points to the owner of a group alias triplet.
	www.laynetworks.com /glossary/o.htm (1757 words)

	Footnotes
		Actually, it would not be efficient if the transmission would be very short, the criteria are discussed in the draft mentioned and [SM97]
		Logical Link Control (LLC), SubNetwork Attachment Point (SNAP)
		The available draft, linked here is not complete and is about to expire at the time of this writing
	margo.student.utwente.nl /simon/finished/thesis/thesis1/footnode.html (1303 words)

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