S interface
Encyclopedia
S interface: For basic rate access
in an Integrated Services Digital Network
(ISDN) environment, a User–network interface reference point
that
Access network
An access network is that part of a telecommunications network which connects subscribers to their immediate service provider. It is contrasted with the core network, which connects local providers to each other...
in an Integrated Services Digital Network
Integrated Services Digital Network
Integrated Services Digital Network is a set of communications standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network...
(ISDN) environment, a User–network interface reference point
Reference Point
Reference Point is the first album by Acoustic Alchemy released in 1990 for jazz label GRP and their fourth album overall.Containing some of the band's more popular tracks, such as the title track "Reference Point", "Same Road, Same Reason" and "Cuban Heels", the nine-track album is also the only...
that
- (a) is characterized by a Four-wire circuitFour-wire circuitIn telecommunication, a four-wire circuit is a two-way circuit using two paths so arranged that the respective signals are transmitted in one direction only by one path and in the other direction by the other path...
, 144 kbit/s (2B+D) user rate, - (b) serves as a universal interface between ISDN terminals or terminalTerminal (telecommunication)In the context of telecommunications, a terminal is a device which is capable of communicating over a line. Examples of terminals are telephones, fax machines, and network devices - printers and workstations....
adapters and the network channelChannel (communications)In telecommunications and computer networking, a communication channel, or channel, refers either to a physical transmission medium such as a wire, or to a logical connection over a multiplexed medium such as a radio channel...
termination, - (c) allows a variety of terminal types and subscriber networks, such as PBXs, local area networkLocal area networkA local area network is a computer network that interconnects computers in a limited area such as a home, school, computer laboratory, or office building...
s (LANs), and controllers, to be connected to the network, and - (d) operates at 4000 48 bitBitA bit is the basic unit of information in computing and telecommunications; it is the amount of information stored by a digital device or other physical system that exists in one of two possible distinct states...
frames per second, i.e., 192 kbit/s, with a user portion of 36 bits per frame, i.e., 144 kbit/s.