TOPICS
SEE ALSO
AUTH
BOOKS
IN CHAPTERS TITLE
DS3
IN CHAPTERS CLASSNAME
IN CHAPTERS TEXT
2.14_-_The_Passive_and_the_Active_Brahman
3.04_-_LUNA
DS3
ENNEAD_04.02_-_How_the_Soul_Mediates_Between_Indivisible_and_Divisible_Essence.
PRIMARY CLASS
chapter
The_Diamond_Sutra
SIMILAR TITLES
DS3 ::: (communications) The third DS level, a framing specification for digital signals in the North American digital transmission hierarchy. A DS3 signal has a transmission rate of 44.736 Megabits per second.DS3 is used, for example, on T3 synchronous Integrated Services Digital Network lines. (1995-01-12)
DS3 "communications" The third {DS level}, a {framing specification} for digital signals in the North American digital transmission hierarchy. A DS3 signal has a transmission rate of 44.736 Megabits per second. DS3 is used, for example, on {T3} synchronous {Integrated Services Digital Network} lines. (1995-01-12)
Asynchronous Transfer Mode "networking" (ATM, or "fast packet", "Asynchronous Transfer Mode Protocol", ATMP) A network {protocol} that dynamically allocates {bandwidth} between incoming channels and multiplexes them onto a stream of fixed 53-{byte} {packets} (called "cells"). A fixed-size packet simplifies switching and multiplexing. ATM is a {connection-oriented} protocol. It can use different {physical layer} transports including {SONET}, {DS3}, {fiber} or {twisted pair}. The {ATM Forum} is one of the main bodies promoting ATM. {Wideband ATM} is an enhancement. {ATM acronyms (http://atmforum.com/atmforum/acronym_index.html)}. {Indiana acronyms (http://cell-relay.indiana.edu/cell-relay/FAQ/ATM-Acronyms.html)}. [More detail? Data rate(s)?] (1996-04-01)
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DS level ::: (communications) (Digital Signal or Data Service level) Originally an AT&T classification of transmitting one or more voice conversations in one digital data stream. The best known DS levels are DS0 (a single conversation), DS1 (24 conversations multiplexed), DS1C, DS2, and DS3.By extension, the DS level can refer to the raw data rate necessary for transmission: DS0 64 Kb/sDS1 1.544 Mb/s technologies or standards (e.g. X.25, SMDS, ISDN, ATM, PDH).Japan uses the US standards for DS0 through DS2 but Japanese DS5 has roughly the circuit capacity of US DS4, while the European standards are rather different bits per second but rates above DS1 are not necessarily integral multiples of 1,544 kb/s. (1998-05-18)
DS level "communications" (Digital Signal or Data Service level) Originally an {AT&T} classification of transmitting one or more voice conversations in one digital data stream. The best known DS levels are {DS0} (a single conversation), {DS1} (24 conversations multiplexed), {DS1C}, {DS2}, and {DS3}. By extension, the DS level can refer to the raw data rate necessary for transmission: DS0 64 Kb/s DS1 1.544 Mb/s DS1C 3.15 Mb/s DS2 6.31 Mb/s DS3 44.736 Mb/s DS4 274.1 Mb/s (where K and M signify multiplication by 1000 and 1000000, rather than powers of two). In this sense it can be used to measure of data service rates classifying the user access rates for various point-to-point {WAN} technologies or standards (e.g. {X.25}, {SMDS}, {ISDN}, {ATM}, {PDH}). Japan uses the US standards for DS0 through DS2 but Japanese DS5 has roughly the circuit capacity of US DS4, while the European standards are rather different (see {E1}). In the US all of the transmission rates are integral multiples of 8000 bits per second but rates above DS1 are not necessarily integral multiples of 1,544 kb/s. (1998-05-18)
high speed serial interface "hardware, communications" (HSSI) A {serial port} which supports serial transmit speeds of up to 52 megabits per second. It is typically used for leased lines such as {DS3} (44.736 Mbps) and {E3} (34 Mbps) and for {Wide Area Network} devices such as {routers}. (1995-11-20)
high speed serial interface ::: (hardware, communications) (HSSI) A serial port which supports serial transmit speeds of up to 52 megabits per second. It is typically used for leased lines such as DS3 (44.736 Mbps) and E3 (34 Mbps) and for Wide Area Network devices such as routers. (1995-11-20)
Integrated Services Digital Network "communications" (ISDN) A set of communications {standards} allowing a single wire or {optical fibre} to carry voice, digital network services and video. ISDN is intended to eventually replace the {plain old telephone system}. ISDN was first published as one of the 1984 {ITU-T} {Red Book} recommendations. The 1988 {Blue Book} recommendations added many new features. ISDN uses mostly existing {Public Switched Telephone Network} (PSTN) switches and wiring, upgraded so that the basic "call" is a 64 kilobits per second, all-digital end-to-end channel. {Packet} and {frame} modes are also provided in some places. There are different kinds of ISDN connection of varying bandwidth (see {DS level}): DS0 = 1 channel PCM at 64 kbps T1 or DS1 = 24 channels PCM at 1.54 Mbps T1C or DS1C = 48 channels PCM at 3.15 Mbps T2 or DS2 = 96 channels PCM at 6.31 Mbps T3 or DS3 = 672 channels PCM at 44.736 Mbps T4 or DS4 = 4032 channels PCM at 274.1 Mbps Each channel here is equivalent to one voice channel. DS0 is the lowest level of the circuit. T1C, T2 and T4 are rarely used, except maybe for T2 over microwave links. For some reason 64 kbps is never called "T0". A {Basic Rate Interface} (BRI) is two 64K "bearer" channels and a single "delta" channel ("2B+D"). A {Primary Rate Interface} (PRI) in North America and Japan consists of 24 channels, usually 23 B + 1 D channel with the same physical interface as T1. Elsewhere the PRI usually has 30 B + 1 D channel and an {E1} interface. A {Terminal Adaptor} (TA) can be used to connect ISDN channels to existing interfaces such as {EIA-232} and {V.35}. Different services may be requested by specifying different values in the "Bearer Capability" field in the call setup message. One ISDN service is "telephony" (i.e. voice), which can be provided using less than the full 64 kbps bandwidth (64 kbps would provide for 8192 eight-bit samples per second) but will require the same special processing or {bit diddling} as ordinary PSTN calls. Data calls have a Bearer Capability of "64 kbps unrestricted". ISDN is offered by local telephone companies, but most readily in Australia, France, Japan and Singapore, with the UK somewhat behind and availability in the USA rather spotty. (In March 1994) ISDN deployment in Germany is quite impressive, although (or perhaps, because) they use a specifically German signalling specification, called {1.TR.6}. The French {Numeris} also uses a non-standard protocol (called {VN4}; the 4th version), but the popularity of ISDN in France is probably lower than in Germany, given the ludicrous pricing. There is also a specifically-Belgian V1 experimental system. The whole of Europe is now phasing in {Euro-ISDN}. See also {Frame Relay}, {Network Termination}, {SAPI}. {FAQ (ftp://src.doc.ic.ac.uk/usenet/news-info/comp.dcom.isdn/)}. {Usenet} newsgroup: {news:comp.dcom.isdn}. (1998-03-29)
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T3 "communications" A {digital carrier} facility used to transmit a {DS3} formatted digital signal at 44.736 megabits per second. See also {Integrated Services Digital Network}. (1994-11-23)
T3 ::: (communications) A digital carrier facility used to transmit a DS3 formatted digital signal at 44.736 megabits per second.See also Integrated Services Digital Network. (1994-11-23)
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