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Topic: 2B1Q

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	BRI U-Interface (Site not responding. Last check: 2007-11-06)
		2B1Q coding is defined in ANSI T1.601 and ETR 080, Annex A. It can operate at distances up to about 18,000 feet (5.5 KM) with loss up to 42 dB.
		By using 2B1Q coding, the data baud rate is 80 Kbaud.
		The data block is applied to a scrambler function (as in most modern modems), and converted to 108 Quat (2B1Q) symbols.
	telecom.tbi.net /isdn-bu.htm (794 words)

	Systems Considerations for the Use of xDSL Technology for Data Access
		The ISDN basic rate access 2B1Q digital subscriber line (DSL) was the first technology of this type to be deployed commercially at 160 kb/s full-duplex transmission on a single twisted pair.
		The ISDN 2B1Q signal consists of voltage pulses of ± 875 V and ± 2.625 V. The symbol rate is 80,000 baud and the energy spectrum used by ISDN peaks at 40,000 Hz.
		The 2B1Q line code is sometimes referred to as a baseband signal because it uses energy in frequencies down to zero, overlapping with the voice frequency band.
	www.comsoc.org /~ci/private/1997/mar/Hawley.html (4565 words)

	ISDN
		2B1Q encoding reduces by half the number of "voltage changes per second" (baud) needed to transmit a given number of bits per second (bit rate).
		The beauty of 2B1Q is that it allows the great majority of existing local loops (up to 18/000 feet long, or 1400 ohm loop resistance) to carry more than twice as much traffic in digital form (BRI) as they carry in analog form.
		As a local loop technology, the U interface with 2B1Q signal format of HDSL offers many advantages for "high speed" data (up to about 750 kbit/s full duplex on a single twisted pair)—even without a real ISDN switched network.
	www.samhassan.com /ISDN.htm (9755 words)

	Telebyte - HDSL Modem - Bomara Associates
		This is accomplished by using 2B1Q signaling technology.
		Real life networks are not ideal but the 2B1Q line code reduces crosstalk and allows signals to be transmitted over much longer distances without repeaters or the removal of bridge taps.
		Since no conditioning of transmission lines is necessary when HDSL is used the Model 681/681 represents a plug and play solution for using copper lines for high speed data transmission and Internet access.
	www.bomara.com /Telebyte/catalog/products/681-682.htm (325 words)

	2B1Q (Site not responding. Last check: 2007-11-06)
		(2B1Q) A physical layer encoding used for Integrated Services Digital Network basic rate interface.
		2B1Q represents two bits (2B - a "dibit") using one of four signal levels (1Q - a "quadratude").
		The first bit of the dibit is indicated by polarity: positive indicates a binary 1 and negative indicates a 0.
	www.linuxguruz.com /foldoc/foldoc.php?2B1Q (107 words)

	Communications News: NT1: key to basic-rate access; ISDN update - integrated services digital network
		Systems designed to comply with the ANSI specification for 2B1Q can be expected to operate satisfactorily on 98% of all non-loaded subscriber loops in the North American two-wire loop plant.
		The service performance objectives of the 2B1Q system were chosen to allow the local telephone company service provider to assign the ISDN loop facility from a normal POTS database.
		In spite of the international convergence on 2B1Q as the accepted line code, differences in the NT1 design exist with respect to the country in which it will be used.
	www.findarticles.com /p/articles/mi_m0CMN/is_n1_v28/ai_9333800 (1483 words)

	What's in an interface?
		However, they must always convert this back to the 2B1Q coding for delivery to the customer because that is the agreed standard in the United States.
		2B1Q stands for two-bits per quat, which is short for quaternary.
		This path comprises two 64kb/s channels, referred to as B channels and a single 16kb/s channel, referred to as a D channel.
	beradio.com /codecs/radio_whats_interface/index.html (884 words)

	Telstra stalling ISDN install? No cards?! - ISDN, DoV
		They are installing about 10 x 2B1Q cards per week (this seems weird all in all and I don't know if he meant across the country or across NSW).
		They said that the 2B1Q cards were not installed in the RIM as yet but that this was supposed to happen by 31/8/05.
		Another positive development which would suggest the RIM limitations have been bypassed (and the 2B1Q installed) is the fact that I can dial up to the net at 45.2 now instead of 31.2.
	forums.whirlpool.net.au /forum-replies-archive.cfm/352595.html (7976 words)

	Glossary (Site not responding. Last check: 2007-11-06)
		2B1Q 2 Binary 1 Quaternary; The predominant signalling protocal used over an ISDNline is called 2B1Q.
		This is a four level line code associating a pair of bits with a single quarternary symbol (quat).
		Simply stated, the 2B1Q protocal represents four voltage levels: +3v, +1v, -1v and -3v.
	www.infoprovider.com /infobase (605 words)

	EETimes.com - Stampede to G.SHDSL leaves HDSL-2 at gate
		The ZipWire 2B1Q chips will be used in legacy SDSL designs, he said.
		The ITU has granted G.SH-DSL a new standard number, G.991.2, which was moved into a determination phase in April and is expected to be approved in February 2001.
		But Ahmed of Intel said that in the meantime, 2B1Q will be popular in the short term, while the current version of G.SHDSL will remain popular alongside ADSL for several years to come.
	www.eetimes.com /story/OEG20000927S0087 (740 words)

	Sample Chapter from Microsoft Encyclopedia of Networking 2nd Edition by Mitch Tulloch and Ingrid Tulloch
		Bellcore also developed an alternate scheme whereby a 2 Binary 1 Quaternary (2B1Q) line coding scheme was employed.
		2B1Q is the same signal encoding mechanism employed by Integrated Services Digital Network (ISDN) and encodes 2 bits/baud instead of the 1 bit/ baud supported by AMI.
		This new technology was called "repeaterless T1" because it eliminated the necessity of regenerating T1 signals every 6000 feet (1830 meters) using repeaters, a process that made original T1 deployments complex and expensive.
	www.microsoft.com /mspress/books/sampchap/5202.asp (3742 words)

	National Cable & Telecommunications Association
		2B1Q - Short for 2 Binary, 1 Quartinary.
		2B1Q is a full-duplex digital signaling technique used by many digital communications technologies (like ISDN) to send data over a single pair of wires.
		It uses a system of three different voltages: one for each of the two binary states (the 2B part of â2B1Qâ) and a third, quartinary voltage that indicates both ends of the data connection are sending the same binary value.
	www.ncta.com /industry_overview/cableGlossary.cfm?indOverviewID=49 (266 words)

	FBI wiretapping (Floyd Davidson; Fred R. Goldstein)
		And at the point where the telephone company is going to monitor a line, it has already been done and the 2B1Q line encoding has no significance.
		On 2B1Q, the two directions are on the same wire.
		At the ends, echo cancellation takes into account the measured echo time and level, and near-end output is simply cancelled.
	yarchive.net /phone/fbi_wiretap.html (2132 words)

	IEC: Spectral Compatibility of Digital Subscriber Line (DSL) Systems (Site not responding. Last check: 2007-11-06)
		The modulation technologies for the DSLs include 2B1Q for ISDN and HDSL, CAP for HDSL and SDSL, DMT for ADSL and DMT RADSL, and CAP RADSL.
		As shown in Table 4, the reach of the EC DSL systems is inversely proportional to the bit rate of the DSL.
		The 2B1Q HDSL system in Table 5 corresponds to the 784—kbps 2B1Q entry, while the CAP HDSL system corresponds to the 784—kbps 64—CAP entry.
	www.iec.org /online/tutorials/spectral_compat/topic09.html (885 words)

	12-Port SDSL Access Multiplexers with TC/PAM (G.SHDSL), 2B1Q or CAP Line Encoding (Site not responding. Last check: 2007-11-06)
		The SAM2000G-12 operates with Transmission Convergence/Pulse Amplitude Modulation (TC/PAM) line code: a sixteen-level PAM technique which incorporates advanced Trellis code, precoding, spectral shaping, equalization circuits and forward error correction.
		The SAM2000Q-12 operates with Two Binary, One Quaternary (2B1Q) line code: a four-level PAM technique which reduces the signaling rate to half of the bit rate.
		The SAM2000G-12 operates with Carrierless Amplitude and Phase (CAP) modulation line code: transmit and receive signals are modulated into two wide-frequency bands that can pass through a filter without being attenuated.
	www.nettonet.com /support/docs/210-0000026_r07.n2n (1978 words)

	National P/N TP3410 - ISDN Basic Access Echo-Cancelling 2B1Q U Transceiver
		TP3410 ISDN Basic Access Echo-Cancelling 2B1Q U Transceiver
		2B1Q Line coding is used, in which pairs of binary bits are coded into 1 of 4 quantum levels for transmission at 80k symbols/sec (hence 2 Binary/1 Quaternary).
		To meet the very demanding specifications for <1 in 10e7 Bit Error Rate even on long loops with crosstalk, the device includes 2 Adaptive Digital Signal Processors, 2 Digital Phase-locked Loops and a controller for automatic activation.
	www.national.com /pf/TP/TP3410.html (418 words)

	hubportal.com - 2b1q
		Read about 2b1q in the free online encyclopedia and dictionary.
		Find 2b1q at one of the best sites the Internet has to offer!
		Find results for 2b1q and anything else you are looking for instantly!
	www.hubportal.com /2b1q.aspx (241 words)

	Austin XDLS Central
		You may test your connection speed by going to BCTel's Test Page or DSLReports Test Page or MSN Speed Test.
		SDSL is based on proven technology that the telephone companies have been using for years for their T1 service (namely 2B1Q encoding), and with a dedicated always on SDSL connection, for the first time, it is economical for small businesses to do the following:
		Well, SDSL should be very comparable to a T1 in terms of performance, since SDSL is based on the same technology as HDSL DS1 or T1 (namely, 2B1Q encoding).
	www.dmitchell.com /AustinDSL.html (1521 words)

	Betterbox Communcations and Network Services Product Spec Sheet
		Using advanced 2B1Q, CAP (or G.SHDSL) line coding techniques, the AM2048 can drive up to 2Mbps worth of data over one or two copper pairs – providing the user with a fully transparent link.
		A version of AM2048 is also available providing up to 60km range using fibre optic technology to transmit the data over a single optical fibre using bi-directional transmission techniques.
		V.35 Standalone 2 or 4 wire 2B1Q driver
	www.betterbox.com /acatalog/AM48BR-B1Q.html (383 words)

	NTN \| SNE2000 \| SHDSL Network Extenders 2000 (Site not responding. Last check: 2007-11-06)
		The SNE2000 uses the DSL The Easy Way™ Packet based architecture utilizing 100% packet based technology for optimum throughput and reliability.
		The SNE2000 products can run CAP, 2B1Q or the SHDSL (TC-PAM) encoding.
		Conversion Kit from Provider Unit to Subscriber Unit consists of PROM and replacement label (2B1Q encoding)
	www.nettonet.com /products/SNE2000 (486 words)

	Patton Electronics Product Catalog - Model 1092A (Site not responding. Last check: 2007-11-06)
		KiloModem, 2B1Q Encoding, 2- or 4-Wire, Baseband Modem
		Local analog and remote digital loopback test modes are built into the Model 1092, as well as a V.52 BERT pattern generator.
		The Model 1092A employs popular 2B1Q encoding and allows clocking to be set for internal, external or receive recover clock.
	commerce.patton.com /pe_products.asp?category=55 (369 words)

	Datasheet catalog for electronic components integrated circuit, transistor, diode, triac, and other semiconductors.
		Datasheet catalog for electronic components integrated circuit, transistor, diode, triac, and other semiconductors.
		ISDN Line Card Transceiver - ISDN Echocancellation Circuit - 2B1Q Code
		ISDN NTs - 2B1Q Second Generation Modular ISDN NT (Ordinary)
	www.datasheetcatalog.com /catalog/p248200.shtml (198 words)

	TKS Glossary
		Specifies 1000 Mbps (baseband) carried over twisted pair.
		It uses a system of three different voltages: one for each of the two binary states (the 2B part of "2B1Q") and a third, quaternary voltage that indicates both ends of the data connection are sending the same binary value.
		More appropriately called PCM Modems-manipulate the way the telephone system works to send data to an analog "modem" type device at speeds of up to 56,000 bits per second (56Kbps).
	www.tkscable.com /glossary.htm (16420 words)

	WAVETEL — ACTRIS ISDN Protocol and Traffic Analysers — EDSS1, QSIG, CorNet, T-Net, 1TR6, DPNSS (Site not responding. Last check: 2007-11-06)
		Basic Rate Access (2B+D), Primary Rate Access (30B+D) and U interface (4B3T & 2B1Q).
		ACTRIS has daisy chain capabilities in order to be compliant with multi-port analysis.
		ISDN protocol analyser for Basic Rate Access at the S/T and U (2B1Q) interfaces – PCMCIA Flash memory 4 or 10 Mbytes
	www.wavetel.fr /gb/actris.htm (602 words)

	Paradyne by Zhone \| Support \| Kbase \| How long should the SNE2000Q-S take to sync up?
		How long should the SNE2000Q-S take to sync up?
		When using 2B1Q the SNE2000Q-S will take slightly longer to connect than when using CAP line encoding.
		This is due to the fact that the units actually connect twice: They first connect to do rate negotiation, which causes a quick flash of the SDSL Connection LED.
	www.paradyne.com /support/kbase/00073.en-us (186 words)

	MT8910 - Digital Subscriber Line Interface Circuit (Obsolete) (Zarlink Semiconductor)
		Full duplex digital transmission at 160 kbit/s on a single twisted pair is achieved using echo cancelling hybrid (ECH) technology.
		This, in conjunction with the high performance 2B1Q line code, allows the DSLIC to meet the loop length requirements of the digital subscriber loops at the U-interface over the entire non-loaded telephone loop plant.
		Insertion loss measurement test signal & quiet mode
	products.zarlink.com /product_profiles/MT8910.htm (220 words)

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