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Topic: LAPB

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HDLC

Frame relay

	LAPB - Wikipedia, the free encyclopedia
		LAPB is a bit-oriented protocol derived from HDLC that ensures that frames are error free and in the right sequence.
		Link Access Protocol, Balanced (LAPB) is used to manage communication and packet framing between data terminal equipment (DTE) and the data circuit-terminating equipment (DCE) devices in the X.25 protocol stack.
		LAPB is nothing but HDLC in Asynchronous Balanced Mode (ABM).
	en.wikipedia.org /wiki/LAPB (512 words)

	X.25 - LAPB \| MLP \| HDLC \| Terminology
		LAPB frame types are defined as commands or responses depending on the address field and the direction of the frame.
		LAPB is the layer 2 protocol used to carry X.25 packets.
		LAPB supports an extended window size (modulo 128) where the number of possible outstanding frames for acknowledgement is raised from 8 to 128.
	www.protocols.com /pbook/x25.htm (3377 words)

	LAPB: Link Access Procedure/Protocol Balanced
		Link Access Procedure, Balanced (LAPB) is a data link layer protocol used to manage communication and packet framing between data terminal equipment (DTE) and the data circuit-terminating equipment (DCE) devices in the X.25 protocol stack.
		LAPB, a bit-oriented protocol derived from HDLC, is actually the HDLC in BAC mode (Balanced Asynchronous Class).
		Finally, LAPB use of the P/F bit is somewhat different from that of the other protocols.
	www.javvin.com /protocolLAPB.html (513 words)

	[No title]
		LAPB interfaces are identified by an ifType object in the Internet-standard MIB [5] of lapb(16).
		Traps Since all LAPB interfaces have entries in the ifTable, significant changes in the state of the interface should send a linkUp or linkDown trap.
		Changing one of these parameters may take effect in the operating LAPB immediately or may wait until the interface is restarted depending on the details of the implementation.
	www.ietf.org /rfc/rfc1381.txt (4406 words)

	Link Access Procedure Balanced mode
		Link Access Procedure, Balanced (LAPB) is a reliable synchronous serial protocol used to manage packet framing between DTE and DCE stations.
		LAPB is capable of placing frames in the correct order, as well as checking packets for errors (error detection) and thus releives higher level protocols from having to perform these functions.
		The binary pattern 01111110 is used to mark the beginning of the LAPB frame.
	www.inetdaemon.com /tutorials/telecom/x25/lapb.shtml (441 words)

	Link Access Procedure Balanced::
		LAPB is a data link-layer protocol that manages communication and packet framing between DTE and DCE devices and is best known for its presence in the X.25 protocol stack.
		Unlike either of these, however, LAPB is restricted to the ABM transfer mode and is appropriate only for combined stations.
		Also, LAPB circuits can be established by either the data terminal equipment (DTE) or the data circuit-terminating equipment (DCE).
	netcert.tripod.com /ccna/wan/lapb.html (182 words)

	The real Los Angeles Party Bus!
		LAPB does not warrant that the functions contained in the materials will be uninterrupted or error-free, that defects will be corrected, or that this site, including bulletin boards, or the server that makes it available, are free of viruses or other harmful components.
		LAPB does not warrant or make any representations regarding the use or the results of the use of the materials in this site or in third-party sites in terms of their correctness, accuracy, timeliness, reliability, or otherwise.
		Under no circumstances, including, but not limited to, negligence, shall LAPB be liable for any direct, indirect, incidental, special or consequential damages that result from the use of, or the inability to use, LAPB materials.
	www.lapartybus.com /terms.htm (621 words)

	rfc1381.txt
		LAPB interfaces are identified by an ifType object in the Internet-standard MIB [5] of
		The relationship between a LAPB interface and an interface in the context of the Internet-standard MIB [5] is one-to-one.
		Since all LAPB interfaces have entries in the ifTable, significant changes in the state of the interface should send a linkUp or linkDown trap.
	www.ufaqs.com /rfc/rfc1381.txt.htm (4183 words)

	RFC1381
		RFC 1381 X.25 LAPB MIB November 1992 the primitives used for this purpose.
		RFC 1381 X.25 LAPB MIB November 1992 to a LAPB configured as either a DCE or a DTE.
		RFC 1381 X.25 LAPB MIB November 1992 The enumerated values of hdlcParmStationType were renumbered from 0 and 1 to 1 and 2.
	www.unix.org.ua /rfc/rfc1381.html (4900 words)

	Gcom - SNA, X.25, Bisync, Frame Relay, LAPB, LAPD, HDLC, SDLC protocol solutions \| Gcom glossary
		The X.25 packet level is a multiplexing protocol in that one lower stream, representing LAPB frames, is demultiplexed into multiple upper streams representing X.25 virtual circuits.
		It uses LAPB as the layer 2 protocol and X.25 packets for the layer 3 protocol.
		The CCITT specification of the parameters for terminals which may be set or interrogated by the user using X.28 commands or by the host using X.29.
	www.gcom.com /home/documents/full_glossary.html (8032 words)

	RFC 1381 - SNMP MIB Extension for X.25 LAPB
		This MIB maybe applied Throop and Baker [Page 4] RFC 1381 X.25 LAPB MIB November 1992 to a LAPB configured as either a DCE or a DTE.
		Throop and Baker [Page 27] RFC 1381 X.25 LAPB MIB November 1992 May 18, 1992 The May 18, 1992 revision of this document (Editor's Internal Reference 2.8) incorporated the following changes: The states of lapbFlowCurrentMode were redefined.
		Throop and Baker [Page 29] RFC 1381 X.25 LAPB MIB November 1992 The enumerated values of hdlcParmStationType were renumbered from 0 and 1 to 1 and 2.
	www.packetizer.com /rfc/rfc1381 (4444 words)

	PL_Data_Link_HDLC
		LAPB which stands for link access procedure balanced is the layer 2 protocol used to carry X.25 packets between an end user and an X.25 public packet data network (PPDN).
		LAPB, as mentioned, is actually a subset of HDLC.
		LAPB however only works with 2 end points or stations so the address field us simply used to indicate whether the frame is a command or a response.
	www.vermontel.net /~rickeary/1_Lectures_v1/PL_Data_Link_HDLC.htm (1705 words)

	Configuring X.25
		LAPB datagram transport--LAPB is a protocol that operates at Level 2 (the data link layer) of the OSI reference model.
		When LAPB detects a missing frame, the router retransmits the frame instead of waiting for the higher layers to recover the lost information.
		LAPB specifies methods for exchanging data (in units called frames), detecting out-of-sequence or missing frames, retransmitting frames, and acknowledging frames.
	www.cisco.com /univercd/cc/td/doc/product/software/ios11/cbook/cx25.htm (13387 words)

	Configuring X.25
		LAPB T1 is the maximum number of seconds the transmitter waits for acknowledgment before initiating a recovery procedure (Response timeout).
		LAPB T2 is maximum number of milliseconds LAPB waits for outgoing data before sending a Restart-Request packet to the network.
		LAPB k specifies the maximum number of sequentially numbered frames that may be unacknowledged at a given time.
	www.hal-pc.org /~ascend/Max/max6000/isptele/x25.htm (7460 words)

	The Virtual Serial Packet Device (VSPD) (Site not responding. Last check: 2007-10-12)
		LAPB control frames have high priority and must be transmitted before any waiting data frames.
		LAPB is a sequenced reliable backward error correcting acknowledged protocol which requires that an outgoing frame acknowledging received frames must acknowledge the most recent frame received.
		LAPB data frames may be retransmitted either because of time-outs or because of a request from the remote end (a REJ frame).
	members.aol.com /Keleustes/syncdob.html (8789 words)

	X.25 and X.121 address, packet switched network, Link Access Protocol Balanced
		LAPB is very robust and can be applied direct to serial links and is often found being used on satellite links.
		Although Link Access Protocol (LAP) can be used with X.25, most commonly LAPB (a variation on the HDLC frame format) is used to provide balanced relationships where either device can send commands and receive responses.
		In the Address field, one side must be configured as a Layer 2 DTE and the other as a Layer 2 DCE (you must not confuse this with the more familiar Layer 1 DCE and DTE designations).
	www.rhyshaden.com /x25.htm (1220 words)

	Advanced Relay: Link Layer Protocols (HDLC/LAPB, HDLC/LAPD, Frame Relay)
		LAPB detects lost or corrupted frames and requests retransmission.
		LAPB can also be used on ISDN B-channel and if supported, on ISDN D-channel and may also be used in IEEE 802.2 LLC.
		To ensure that the Link is in a Disconnect State, LAPB can also be configured to start with a DISC/P=1 (Disconnect frame with Poll-Bit) every T1 seconds up to Max Retransmissions times.
	www.advancedrelay.com /html/products/link.html (801 words)

	Blunk Microsystems Releases TargetLAPB 2003.1, its Embedded LAPB Protocol Stack
		Flow control is provided by LAPB’s sliding window protocol and receiver-not-ready (RNR) frames.
		LAPB parameters T1, T2, T4, N2, window size, sequence number modulus (standard or extended), and addressing (DTE or DCE) are independently set for each channel.
		The following LAPB events can be reported by an optional callback function supplied to lapbInit(): N2 unacknowledged SABM/SABME commands, N2 unacknowledged DISC commands, N2 RNR responses, frame reject, physical disconnect, link reset, link reconnect, all I-frames acknowledged, and I-frame arrival.
	www.blunkmicro.com /pr_lapb.htm (453 words)

	Advanced Relay: X.25 to TCP/IP Converter/Gateway
		At the transmitter, the X.25 packets are routed from the lower edge of the X.25 packet layer to the XOT client using the LayGO Return Layer.
		At the receiver, the LAPB or LAPD frame is routed to the lower edge of the link layer (frame level) using the LayGO Return Layer.
		At the transmitter, the LAPB or LAPD frames are routed from the lower edge of the X.25 link layer to the aXOT client using the LayGO Return Layer.
	www.advancedrelay.com /html/pxs/x25tcpip.html (1166 words)

	LAPB PCI (Site not responding. Last check: 2007-10-12)
		Move the mouse pointer to any protocol field and press the left mouse button.
		LAPB is used by X.25 on OSI layer 2 (data-link) for signalling between DTE and DCE.
		LAPB was derived from HDLC: LAPB is HDLC in BAC mode (Balanced Asynchronous Class).
	www.synapse.de /ban/HTML/P_LAYER2/Eng/P_lay146.html (44 words)

	LAPB - Link Access Procedure Balanced
		LAPB is a bit-oriented protocol derived from HDLC.
		In X.25 packet-switched networks, a link initialization procedure that establishes and maintains communications between the DTE and DCE; LAPB involves the T1 timer and N2 count parameters.
		Every attempt has been made to provide you with the correct acronym for LAPB.
	www.auditmypc.com /acronym/LAPB.asp (138 words)

	Novell Documentation: Novell Internet Access Server 4.1 - General PPP WAN Connection Optimization Techniques
		LAPB T1 Ack Timeout---Specifies the maximum number of seconds that this LAPB interface waits to receive an acknowledgment for a previously transmitted information frame.
		LAPB T4 Idle Link Timeout---Specifies the maximum number of seconds this LAPB interface can remain idle (without send or receive exchanges) before an RR (Receiver Ready) or RNR (Receiver Not Ready) supervisory frame is sent to the remote LAPB peer.
		LAPB uses both the address and control fields dynamically.
	www.novell.com /documentation/nias41/ppp__enu/data/h91zd3rz.html (2036 words)

	[No title]
		This identifies the action LAPB will take when it receives a DM response.
		This object identifies the version of the lapb protocol implemented by this interface.
		This table defines the objects recorded by LAPB to provide information about the traffic flow through the interface.
	www.simpleweb.org /ietf/mibs/modules/IETF/xml/RFC1381-MIB.xml (1250 words)

	LAPB Protocol Stack for Embedded Networking
		TargetLAPB from Blunk Microsystems is a full-featured ISO/IEC 7776 compliant LAPB protocol stack for use in embedded applications.
		TargetLAPB 2003.1, the newly released embedded LAPB protocol stack, is suited both for applications requiring strict ISO/IEC 7776 compatibility and for applications requiring high performance flow control and reliability over point-to-point networks.
		BlunkBox is designed to exercise the HDLC, LAPB, and application software of products containing a LAPB connection.
	www.blunkmicro.com /lapb.htm (449 words)

	config.pm5
		For LAPB and PPP, this parameter sets the retry value SABMs in LAPB and configuration requests in PPP.
		For frame relay, this timer is the "keepalive" or status enquiry timer.
		The link level protocol (LAPB) requires that one device on a link be 3 (DTE) and the other 1 (DCE).
	www.academ.com /~sob/et/config.htm (1560 words)

	Roxen Community: RFC 1381 SNMP MIB Extension for X.25 LAPB ()
		The objects below define the LAPB specific information for an interface of type LAPB.
		This MIB maybe applied to a LAPB configured as either a DCE or a DTE.
		-- Support for the lapbXidTable is mandatory for all agents -- of systems that have a LAPB implementation using XID -- negotiation.
	community.roxen.com /developers/idocs/rfc/rfc1381.html (5911 words)

	Live Animals and Perishables Board (LAPB)
		The IATA Live Animals and Perishables Board (LAPB) - Cargo - brings together interested parties, official bodies and other governmental authorities to develop regulations for the acceptance, handling and loading of live animals in air transport.
		The adoption of regulations for the acceptance, handling and loading of live animals in air transport
		The LAPB consists of upto 12 members appointed by the Cargo Services Conference (CSC), each being an expert in the live animals or perishables area.
	www.iata.org /workgroups/lapb (168 words)

	RFC 1381
		-- LAPB MIB lapb OBJECT IDENTIFIER ::= { transmission 16 } PositiveInteger ::= INTEGER (0..2147483647) IfIndexType ::= INTEGER (1..2147483647) -- IfIndexType specifies an index object for a table -- with entries that match entries in the MIB-II ifTable.
		Changing one of these parameters may take effect in the operating LAPB immediately or may wait until the interface is restarted depending on the details of the
		::= { lapbFlowEntry 11 } -- ########################################################### -- LAPB XID Table -- ########################################################### -- Support for the lapbXidTable is mandatory for all agents -- of systems that have a LAPB implementation using XID -- negotiation.
	www.process.com /techsupport/pmdf/rfc/rfc1381.html (4965 words)

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