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Topic: Asynchronous Balanced Mode

	ABM - Asynchronous Balanced Mode
		Asynchronous Balanced Mode (network) A communication mode used in HDLC and derivative protocols that allows either of two workstations in a peer-oriented point-to-point configuration to initiate a data transfer.
		ABM is one of three types of data transfer modes in the HDLC family of protocols: Normal Response Mode (NRM).
		The ABM missiles were targeted at incoming missiles.
	www.auditmypc.com /acronym/ABM.asp (355 words)

	Gcom - SNA, X.25, Bisync, Frame Relay, LAPB, LAPD, HDLC, SDLC protocol solutions \| Gcom glossary
		Asynchronous data transmission is the method used by most modems in computers today.
		Asynchronous communication can utilize at most 80% of the line bandwidth due to the 2 bits out of 10 overhead for the start and stop bits.
		The serial chip usually has modes of operation in which it recognizes basic framing characteristics of the data such as start and stop bits in asynchronous mode and flags and zero insertion in bit oriented synchronous mode.
	www.gcom.com /home/documents/full_glossary.html (8032 words)

	HDLC - A Technical Overview
		This is the mode in which the primary station initiates transfers to the secondary station.
		Due to the fact that this mode is Asynchronous, the secondary station must wait until it detects and idle channel before it can transfer any frames.
		The IM mode is different from the operations modes in that the secondary station's data link control program is in need of regeneration or it is in need of an exchange of parameters to be used in an operational mode.
	members.tripod.com /~vkalra/hdlc.html (2500 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.
		Unlike either of these, however, LAPB is restricted to the Asynchronous Balanced Mode (ABM) transfer mode and is appropriate only for combined stations.
		In order to ensure that the bit pattern of the frame delimiter flag does not appear in the data field of the frame (and therefore cause frame misalignment), a technique known as Bit Stuffing is used by both the transmitter and the receiver.
	www.networkdictionary.com /protocols/lapb.php (513 words)

	X.25 - LAPB \| MLP \| HDLC \| Terminology (Site not responding. Last check: 2007-10-13)
		In particular, the logical functions and protocols of secondary stations and combined stations are specified identically with respect to the action taken and the response frames.
		Asynchronous Response Mode (ARM): This mode is similar to NRM and is signified by the SARM(E) frame.
		Asynchronous Balanced Mode (ABM): This mode is totally balanced (i.e., no master/slave relationship) and is signified by the SABM(E) frame.
	www.protocols.com /pbook/x25.htm (3377 words)

	What is HDLC
		Asynchronous Response Mode (ARM - Asynchronous Response Mode: This mode is used in unbalanced configurations.
		This mode is normally used with point-to-point configurations and full duplex links and allows the secondary station to send frames asynchronously with respect to the primary station)
		Asynchronous Balanced Mode (ABM - The Asynchronous Balanced Mode (ABM), is used mainly on full duplex point-to-point links for computer to computer communications and for connections between a computer and a packed switched data network, in this case each station has an equal status and performs the role of both primary and secondary functions.
	www.pulsewan.com /data101/hdlc_basics.htm (1377 words)

	Asynchronous Machine (SimPowerSystems)
		The mode of operation is dictated by the sign of the mechanical torque (positive for motoring, negative for generating).
		The stator terminals of the Asynchronous Machine block are identified by the A, B, and C letters.
		The Asynchronous Machine block does not include a representation of the effects of stator and rotor iron saturation.
	www.weizmann.ac.il /matlab/toolbox/powersys/asynchronousmachine.html (1113 words)

	Synchronous Serial Communication Overview by Quatech
		The theory behind asynchronous and synchronous communication is essentially the same: Point B needs to know when a transmission from Point A begins, when it ends, and if it was processed correctly.
		With asynchronous communication you would need to stop after every word to make sure the listener understood your meaning, and knew that you were about to speak the next word.
		ABM mode requires that all devices be configured as combination nodes that, depending on the situation, can assume the role of primary or secondary in the network.
	www.quatech.com /support/comm-over-syncserial.php (1938 words)

	HDLC Modes of Operation (Site not responding. Last check: 2007-10-13)
		The HDLC protocol is a general purpose data link control protocol capable of supporting a range of modes of operation.
		In this mode, the packets are carried in a UI frame, and a best-effort delivery is performed (i.e.
		In this mode, the packets are carried in numbered I-frames, which are acknowledged by the receiver using numbered supervisory frames.
	www.erg.abdn.ac.uk /users/gorry/course/dl-pages/hdlc-mode.html (245 words)

	New Page 3
		Mode that permits control signals and commands to establish and terminate calls in V.25bis.
		HDLC communication mode involving one primary station and at least one secondary station, where either the primary or one of the secondary stations can initiate transmissions.
		Asynchronous transmissions usually encapsulate individual characters in control bits (called start and stop bits) that designate the beginning and end of each character.
	www.usfca.edu /~villegas/ccna/2/index/glossary/a.html (2821 words)

	Body (Site not responding. Last check: 2007-10-13)
		ABM, which is 'preferred' for use in networks is known as Asynchronous Balanced Mode.
		The term balanced refers to the fact that the two ends of the link are in effect equal partners in the communication.
		Asynchronous, when used in this context, is a logical rather than a physical concept, and in fact the protocol would normally be used on communication lines which, physically, operate in a synchronous manner.
	www.doc.mmu.ac.uk /online/networks/net12.htm (1605 words)

	Glossary
		ABM is one of three types of data transfer modes in the HDLC family of protocols:
		Asynchronous operation means simply that bits are not transmitted on any strict timetable.
		An asynchronous operation is one in which bits are not transmitted on any strict timetable.
	www.dqcs.com /networking/glossary/glossary.html (4465 words)

	[No title]
		The application entity descriptor also specifies the default application mode to be used for associations that are established by the application entity.
		In communications, an operational mode of a balanced data link in which either combined station can send commands at any time and can initiate transmission of response frames without explicit permission from the other combined station.
		In communications, an operational mode in which modulus 128 sequence numbers are used.
	www.redbooks.ibm.com /pubs/html/as400/v4r5/ic2924/info/RZAATMST04.HTM (11653 words)

	WildPackets - Type II LLC
		This mode of interaction is referred to by IBM as the Normal Response Mode.
		It was considered ‘asynchronous and balanced’ because either side could initiate a conversation and either side could send data without the explicit permission of the other side.
		This is the opposite of a ‘polled’ conversation mode.
	www.wildpackets.com /support/compendium/llc/type2_llc (505 words)

	X.25 frame types - Martin Baker
		If the link is already in ABM a SABM-UA exchange can be used to reset the sequence numbers and to clear any RNR busy condition any previously transmitted I frames that are unacknowledged remain unacknowledged.
		The DM response is used to report a status where the sender is logically disconnected from the link, and is in the disconnected phase.
		The DM response may be sent in this phase to request a set mode command, or, if sent in response to the reception of a set mode command, to inform the remote end that the sender is still in the disconnected phase and cannot action the set mode command.
	www.euclideanspace.com /coms/protocol/x25/link/f_types/index.htm (776 words)

	S
		In GL, a mode in which the frame buffer bitplanes are organized into a single large frame buffer.
		An optical fiber in which only the lowest-order bound mode (which can consist of a pair of orthogonally polarized fields) can propagate at the wavelength of interest.
		Asynchronous transmission in which a group of signals representing a character is preceded by a start element and followed by a stop element.
	www.unet.univie.ac.at /aix/aixuser/glossary/S.htm (11393 words)

	Telebyte - PC Comscope HDLC Protocol Decode Program
		In captured mode (data in the capture buffer or from a journal file) the application decodes one frame each time the user hits a key.
		In captured mode you can move through the data with the arrow keys the same way you do when in Review Captured Data mode with no application program selected.
		In captured mode you step through the data one frame at a time and you can move back and forth in the captured data.
	www.bomara.com /Telebyte/catalog/manuals/m904hdlc.htm (1876 words)

	A
		Asynchronous also refers to commands, such as in a windowing environment, that may be sent without waiting for a response from the previous command.
		Asynchronous System Trap (AST) An AST is a request to be notified when a certain event occurs.
		Asynchronous Transfer Mode (ATM) A method for the dynamic allocation of bandwidth using a fixed-size packet (called a cell).
	cybersummit.org /djones/512_633articles/glossary/amain.htm (8214 words)

	HDLC - High Level Data Link Control
		SNRM and SABM frames, for example, are used both to set up logical link between the primary and the secondary station and to inform the secondary station of the mode of operation to be used.
		There are four types of supervisory frames but only RR and RNR are used in both NRM and ABM These frames are used both to indicate the willingness or otherwise of a secondary station to receive an information frame from the primary station, and for acknowledgment purposes.
		REJ and SREJ frames are used only in ABM which permits simultaneous two-way communication across a point to point link.
	www2.rad.com /networks/1994/hdlc/hdlc.htm (748 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).
		I think the easiest way to explain Response Mode is to give you a real life example of Normal Response Mode NRM.
		In the case of ATM's, perhaps the balance in your checking account, or maybe an authorization for the ATM to dispense $20.
	www.vermontel.net /~rickeary/1_Lectures_v1/PL_Data_Link_HDLC.htm (1705 words)

	SDLC, HDLC and LLC, LAPB
		Link Access Protocol Balanced (LAPB) is one of the three layers making up X.25 and was a development by ITU-T, of LAP which itself came from HDLC.
		Balanced - where two combined stations communicate over a point-to-point link which can be full/half-duplex or switch/unswitched.
		Asynchronous Balanced Mode (ABM) where either station can initiate transmission without permission from the other.
	www.rhyshaden.com /hdlc.htm (1719 words)

	What is SDLC
		In this mode, secondaries cannot communicate with a primary until the primary has given permission.
		In ABM environments, any combined station can initiate data transmission without permission from any other station.
		Unlike either of these, however, LAPB is restricted to the ABM transfer mode and is appropriate only for combined stations.
	www.pulsewan.com /data101/sdlc_basics.htm (1390 words)

	High-Level Data Link Control - Wikipedia, the free encyclopedia
		HDLC can be used for point to multipoint connections, but is now used almost exclusively to connect one device to another, using what is known as Asynchronous Balanced Mode (ABM).
		Asynchronous Response Mode (ARM) is an unbalanced configuration in which secondary terminals may transmit without permission from the primary terminal.
		Asynchronous Balanced Mode (ABM) is a balanced configuration in which either station may initiate the transmission.
	en.wikipedia.org /wiki/HDLC (1578 words)

	IBM Globalization - Terminology
		An ADSI control mode in which the ADSI telephone is controlled through a dialog with a voice response system.
		In communications, a data link control command used to initiate data transfer in the extended asynchronous balanced mode of operation with a remote link station.
		As part of the settling procedure, there might be some reconciliation or balancing steps (depending on the cassette and financial institution policy) to ensure that the merchant and financial institution agree on the funds being transferred.
	www-306.ibm.com /software/globalization/terminology/s.jsp (12718 words)

	A
		HDLC (and derivative protocol) communication mode supporting peer-oriented, point-to-point communications between two stations, where either station can initiate the transmission.
		The connection mode that eliminates several steps during IKE authentication negotiation (phase 1) between two or more IPSec peers.
		Aggressive mode is faster than main mode but not as secure.
	www.cisco.com /univercd/cc/td/doc/cisintwk/ita/a12.htm (5150 words)

	[No title] (Site not responding. Last check: 2007-10-13)
		SABM Set Asynchronous Balanced Mode - Two combined stations (each is primary and secondary) send commands and responses.
		Includes basic HDLC in Asynchronous Balanced Mode (SABM, RR, RNR, UA, DISC, DM, and FRMR) with HDLC extensions 2 (add REJ for full duplex) 8 (don't respond to poll with I frame), and 10 (SABME for 7-bit sequence numbers).
		LAP-D uses HDLC Asynchronlus Balanced Mode (SABM, RR, RNR, UA, DISC, DM, and FRMR) with extensions 2 (add REJ for full duplex), 7 (multibyte addresses), 8 (don't respond to poll with I frame), 10 (SABME for 7-bit sequence numbers).
	www.temple.edu /stafford/cis320f05/lecture/chap5/hdlc.txt (1328 words)

	BT Designer: Glossary: A - E
		ABM Asynchronous Balanced Mode: the mode used by RFCOMM when connected.
		ACK AC Knowledge: a bit used in Bluetooth wireless baseband packets to acknowledge that the last packet was received correctly.
		Active Mode In the active mode, the Bluetooth wireless unit actively participates on the channel.
	www.btdesigner.com /atoe.htm (2276 words)

	ABM (asynchronous balanced mode ) :: Defintion :: IT-Lexikon
		ABM (asynchronous balanced mode) :: Defintion :: IT-Lexikon
		Der Asynchronous Balanced Mode ist eine Basisbetriebsart des HDLC-Protokolls.
		Geräte, die an ein LAN angeschlossen sind, können mittels ABM unabhängig voneinander Verbindungsbefehle senden und Antworten auslösen. Bei bitorientierten Steuerungsverfahren bezeichnet ABM eine Betriebsart, in der Hybridstationen in einer Punkt-zu-Punkt-Verbindung arbeiten.
	www.itwissen.de /defintion/lexikon/sicherungsprotokolle/01-004804.html (111 words)

	SABM - Set Asynchronous Balanced Mode (Site not responding. Last check: 2007-10-13)
		For systems that work in the ABM (Asynchronous Balanced Mode).
		The DTE (Data Terminal Equipment) and DCE (Data Circuit Terminating Equipment) are treated as equals.
		The initiator for Asynchronous Balanced Mode sends a SABM.
	www.mpirical.com /companion/Multi_Tech/SABMMode.htm (59 words)

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