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defense switched network
(czen) | Defense Switched Network,DSN[zkr.] [voj.] Zdeněk Brož a automatický
překlad |
Switched
(gcide) | Switch \Switch\, v. t. [imp. & p. p. Switched; p. pr. & vb. n.
Switching.]
1. To strike with a switch or small flexible rod; to whip.
--Chapman.
[1913 Webster]
2. To swing or whisk; as, to switch a cane.
[1913 Webster]
3. To trim, as, a hedge. [Prov. Eng.] --Halliwell.
[1913 Webster]
4. To turn from one railway track to another; to transfer by
a switch; -- generally with off, from, etc.; as, to switch
off a train; to switch a car from one track to another.
[1913 Webster]
5. (Eccl.) To shift to another circuit.
[1913 Webster] |
circuit switched
(foldoc) | circuit switching
circuit switch
circuit switched
Communication via a single dedicated path
between the sender and receiver. The telephone system is an
example of a circuit switched network.
The term connection-oriented is used in packet-based
networks in contrast to connectionless communication or
packet switching.
(2006-09-20)
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digital switched network
(foldoc) | Digital Switched Network
DSN
(DSN) The completely digital version of the
PSTN.
(1997-07-18)
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full-duplex switched ethernet
(foldoc) | full-duplex Switched Ethernet
FDSE
(FDSE) A Switched Ethernet link which can carry
data in both directions simultaneously, doubling transmission
capacity from the usual 10 to 20 megabits per second.
(1996-06-20)
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high speed circuit switched data
(foldoc) | High Speed Circuit Switched Data
HSCSD
(HSCSD) A planned feature of GSM Phase 2
defining a standard for circuit switched data transmission
over a GSM link at up to 57.6 (78.8?) kbps. This is
achieved by concatenating up to four consecutive GSM
timeslots, each of which is capable of 14.4 kbit/s. It uses
multiplexing and compression or filtering.
The following services toward the fixed network are
supported: V.34 up to 28.8 kbps and V.110 with rate
adaptation up to 38.4 kbps.
HSCSD is aimed at mobile workstation users. As it is
circuit switched, it is suited to streaming applications
such as video conferencing and multimedia. Bursty
applications like electronic mail, are more suited to
packet switched data (as in GPRS).
{Ericsson
(http://ericsson.com/wireless/products/mobsys/gsm/subpages/wise/subpages/hscsd.shtml)}.
(http://gsmworld.com/).
(1999-12-04)
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label switched path
(foldoc) | label switched path
(LSP) The specific path through a network that a
datagram follows, based on its MPLS labels.
(1999-06-14)
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packet-switched
(foldoc) | packet switching
packet switch
packet-switched
A communications paradigm in which packets
(messages or fragments of messages) are individually routed
between nodes, with no previously established communication
path. Packets are routed to their destination through the
most expedient route (as determined by some routing
algorithm). Not all packets travelling between the same two
hosts, even those from a single message, will necessarily
follow the same route.
The destination computer reassembles the packets into their
appropriate sequence. Packet switching is used to optimise
the use of the bandwidth available in a network and to
minimise the latency. X.25 is an international standard
packet switching network.
Also called connectionless. Opposite of circuit switched
or connection-oriented. See also virtual circuit,
wormhole routing.
(1999-03-30)
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public switched telephone network
(foldoc) | Public Switched Telephone Network
Plain Old Telephone System
PSTN
(PSTN, T.70) The collection of interconnected
systems operated by the various telephone companies and
administrations (telcos and PTTs) around the world. Also
known as the Plain Old Telephone System (POTS) in contrast to
xDSL and ISDN (not to mention other forms of PANS).
The PSTN started as human-operated analogue circuit switching
systems (plugboards), progressed through electromechanical
switches. By now this has almost completely been made
digital, except for the final connection to the subscriber
(the "last mile"): The signal coming out of the phone set is
analogue. It is usually transmitted over a {twisted pair
cable} still as an analogue signal. At the telco office
this analogue signal is usually digitised, using 8000 samples
per second and 8 bits per sample, yielding a 64 kb/s data
stream (DS0). Several such data streams are usually
combined into a fatter stream: in the US 24 channels are
combined into a T1, in Europe 31 DS0 channels are combined
into an E1 line. This can later be further combined into
larger chunks for transmission over high-bandwidth core
trunks. At the receiving end the channels are separated, the
digital signals are converted back to analogue and delivered
to the received phone.
While all these conversions are inaudible when voice is
transmitted over the phone lines it can make digital
communication difficult. Items of interest include A-law to
mu-law conversion (and vice versa) on international calls;
robbed bit signalling in North America (56 kbps 64
kbps); data compression to save bandwidth on long-haul
trunks; signal processing such as echo suppression and voice
signal enhancement such as AT&T TrueVoice.
(2000-07-09)
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switched multimegabit data service
(foldoc) | Switched Multimegabit Data Service
SMDS
(SMDS) An emerging high-speed datagram-based
public data network service developed by Bellcore and
expected to be widely used by telephone companies as the basis
for their data networks.
See also Metropolitan Area Network.
(1997-01-31)
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switched virtual circuit
(foldoc) | virtual circuit
switched virtual circuit
A connection-oriented network service which
is implemented on top of a network which may be either
connection-oriented or connectionless (packet switching).
The term "switched virtual circuit" was coined needlessly to
distinguish an ordinary virtual circuit from a {permanent
virtual circuit}. (One of the perpetrators of this confusion
appears to be ["Networking Essentials", 1996, Microsoft Press,
ISBN 1-55615-806-8], a book aimed at people preparing for the
MCSE exam on LANs and WANs).
Not to be confused with switched virtual connection.
(2001-10-26)
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switched virtual connection
(foldoc) | switched virtual connection
(SVC) A virtual connection in an ATM network
set up on demand by the signalling control point.
Contrast with permanent virtual connection.
(2001-06-29)
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