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Jargon Buster
The du Pré Jargon Buster found the following for - SNos A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Term
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Explanation
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| S reference point | An ISDN term. The interface between the telephone system and an So-bus | |
| S/T reference point | An ISDN term. The interface between the NT1 and the TE1(s) on an So-bus | |
| Saturation | Where the volume of data traffic on a network is close to the maximum it can handle | |
| SCRA | Single-line Call Routing Apparatus | |
| SCSA | Signal Computing System Architecture. An open standard architecture for specifying the interfaces for PC-based CTI applications | |
| SCSI | Small Computer Systems Interface. A high speed controller that can co-ordinate up to seven devices, and can also speed up communications with disk drives | |
| SDC | Supplier’s Declaration of Conformity. In April 2001, this document replaces the TEC Annex, which replaced the PXML | |
| SDH | Synchronous Digital Hierarchy. Can achieve 2.5Gbit/s. 0.1Gbit/s faster than PDH | |
| SDLC | Synchronous Data Link Control. A transmission protocol developed by IBM in the 1970s as a replacement for its binary synchronous (BSC) protocol. SDLC is equivalent to layer 2 of the OSI model | |
| SDRAM | Synchronous Dynamic Random Access Memory. A fast form of memory | |
| SDSL | Symmetric Digital Subscriber Line. A technology which allows more data to be sent over existing copper telephone lines, supporting data rates at up to 3Mbit/s. Works by sending high frequency digital pulses not used by normal voice communications simultaneously with voice connections over the same wires. Requires a special SDSL modem. Called Symmetric since it supports the same data rate both upstream and downstream. See ADSL | |
| Secondary Socket | see Extension Socket | |
| Select Services | see BT Select Services | |
| SelectLink | A BT term. Associted with BT's Advanced Features. Callers direct themselves to the service they want. Caller satisfaction can be increased (if the feature is used properly see Design Guidelines below for further information.) Different levels of service can be offered. Calls can be handled on the basis of priority. Reduces the need for live operators to transfer calls. Reduces the need for private lines between premises to transfer calls. Operational costs reduced, calls filtered in the network and not by the customer. | |
| Separacy | A BT network term. Where BT provides two or more completely separate routes to the user from the network, even is both use the same duct and entrance to the user | |
| Serial Port | see RS232 | |
| Server | Used in a network. The host machines that house the files used by other PCs or workstations on the network. Usually powerful, with high capacity HDs | |
| Services Duct | see Riser | |
| Session Layer | Layer 5 of the OSI reference model. Provides the synchronisation and management of the dialogue between applications | |
| Seven Layer Model | See OSI Reference Model | |
| SFF Committee | The SFF Committee is an ad hoc group formed to address storage industry needs. When formed in 1990, the original goals were limited to defining de facto mechanical envelopes for disk drives so they could fit into laptop computers and other small products. This has since been widened to cover many technical issues, and the committee now publishes many specifications. | |
| SFP | Small Form-Factor Pluggable | |
| SFT | System Fault Tolerance | |
| SHDS | Short Haul Data Service. A BT term | |
| SHF | A radio transmission term. Super High Frequency. 1300 MHz – 2000 MHz | |
| SI | Statutory Instrument | |
| Sidetone | When using a telephone handset, for example, what is said into the microphone is fed back to the earpiece. This prevents the user from speaking more loudly then usual due to partial deafness caused by the covering of the ear by the earpiece. The feedback is called sidetone | |
| SIM | A cellular radio term. Subscriber Identification Module. SIM cards are small smart cards that fit inside phones based on the GSM technology. SIMs contain personalized information about its user including the network activation and even phone book entries. One can put its SIM card in another GSM phone and use it as if it was his own phone | |
| SIMMS | Single In-Line Memory Module. Enables those who want to upgrade PAM to snap additional memory in the slot provided | |
| Single Side Band | A term often relating to radio transmission. A method used to reduce the amount of bandwidth a signal occupies | |
| SIP | Session Internet Protocol. A SIP trunk permits businesses to adopt Voice-over-IP (VoIP) using the same connection as their Internet connection, offering voice, data, video and instant messaging. A SIP trunk replaces a business's PSTN and ISDN connections. SIP signalling is similar to http. However, a SIP trunk remains a half-way house solution since it still requires an in-house telephone system. Full IP Telephony, such as du Pré Connect is replacing this SIP trunking technology. |
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| SIR | An SMDS term. Sustained Information Rate | |
| Site Connector | An IT term. A site connector allows a site to connect to another site when using Microsoft Exchange e-mail. Hence, Exchange can be installed on more than 1 server and be connected | |
| SLT | Single line Telephone. Another term for POT | |
| Smart Hub | A central network concentrator which supports bridges, routers, etc | |
| Smart Switches | Devices that enable computer peripherals (e.g., printers) to be shared without installing a network | |
| SMDR | Station Message Detail Recording. A Call Logging term, where detailed information on incoming and outgoing telephone calls are output via a serial port (V.24). Can also, in some cases, output details of the telephone system's programming | |
| SMDS | Switched Multi-megabit Data Service | |
| SMS | Short Message Service | |
| SMTA | Single-line Multi-extension Telephone Apparatus. No call routing capability, and all telephones connected in parallel, offering no secrecy at all | |
| SMTP | Simple Mail Transfer Protocol. A protocol used to transfer electronic mail between computers, usually over the Internet - a server to server protocol. Other protocols are used to access the messages | |
| SNA | Systems Network Architecture. A series of synchronous communications protocols developed in the 1970s by IBM, for synchronous communications. A very disliked system, not liked at all in the industry | |
| SNI | A BT term. Subscriber Network Interface. The BT side of the SMDS NTE or DSU | |
| SNMP | Simple Network Management Protocol. A network management protocol for use with TCP/IP which is becoming increasingly popular as a precept to NW/OSI | |
| So-bus | The cabling which runs from a BRA Line Box within the customer’s premises, to which terminal equipment is attached. Depending upon what bandwidth a terminal requires, it may use one or both of the two B channels at any one time. If only one channel, then another device can use the other. Hence, different terminals must compete for access to the So-bus. The suffix 'o' refers to the last digit of I.420, indicating I.420 signalling which in turn indicates BRA | |
| Socket | A housing containing outlets, into which plugs fit. A socket may have one or more outlets. Hence, a socket with two outlets is called a double outlet | |
| Soft Numbering | A PTO is unlikely to be able to issue a DDI range which coincides with the extension numbering of the telephone system. Hence, within the system’s software, the facility exists to soft number, to redirect certain dialled numbers to specific extensions. It is not good practice to use soft numbers beginning with the digit 1 | |
| SOHO | Small Office / Home Office. Working from home or a remote location | |
| SP | A BT term. Service Provider. Associted with BT's Inbound Services | |
| SPC | Stored Program Control. Applied to telephone systems and exchanges which are computer controlled by a fixed, yet configurable, program | |
| Speech Band | When applied to a Private Circuit, BT defines this as a frequency range of 300 to 3,400Hz, sometimes referred to as The Commercial Speechband | |
| Speech Line | A BT term for one of its voice transmission Private Circuits | |
| Speech Path | A potential connection between two telephones or devices. For example, ten telephones would require 5 Speech Paths to enable every telephone to be in use at the same time. | |
| SPL | Self Provision Licence. The full title is “Class licence for the running of self-provided telecommunication systems granted by the Secretary of State under section 7 of the Telecommunications Act 1984” | |
| SPX | Sequenced Packet Exchange. A transport layer protocol, layer 4 of the OSI reference model, used in Novell Netware networks. The SPX layer sits on top of the IPX layer (level 3) and provides connection-orientated services between two nodes on the network. SPX is used primarily by client server applications. Whereas the IPX protocol is similar to IP, SPX is similar to TCP. Together, therefore, IPX/SPX provides connection services similar to TCP/IP | |
| Squelch | A term often relating to radio transmission. Circuitry to suppress receiver noise in the absence of signals | |
| SRAM | Static Random Access Memory. A high performance, but expensive form of RAM. Therefore, usually only used in Cache form | |
| SRBR | Short Range Business Radio. Usually refers to 2-way radio communication | |
| SS#7 | The conversion system in the PTO exchange to convert DASS2 to Q.931 | |
| SSL | A term associated with Digital Certificate, an Internet term. Secure Sockets Layer - a method of data exchange to secure the highly sensitive Internet traffic generated by organisations in the banking, financial services, insurance and healthcare sectors, and for companies trading on the Internet | |
| Standard Access | Available as one of the two forms of access when using BT's ISDN2e lines. 'Standard Access' is provided where the lines are connected to an So-bus via the NTE (with no telephone system involved) to support between one and eight terminal equipments. In this case, MSN is supported | |
| Standard Telephone Cable | Twisted pair cable where each wire has a cross sectional area of 0.5mm2 | |
| Star | A network topology. Several cables which run from the server to the individual workstation | |
| Star Services | see BT Star Services | |
| Staring At | see Good Staring At | |
| Stat Mux | Statistical Multiplexor. A device that divides a data channel into a number of independent data channels greater than would be indicated by the sum of the data rates of those channels. It does this on the basis that not all channels will want to transmit simultaneously, thereby freeing capacity to accommodate additional channels | |
| STD | Subscriber Trunk Dialling. Where a telephone subscriber is able to dial the required destination without operator assistance. Introdcued with limited UK access in 1958. Full UK access was completed in 1979. See IDD | |
| STM | Synchronous Transfer Mode | |
| STP | Shielded twisted pair cable. The opposite of unshielded twisted pair cable | |
| Strowger | Almon Brown Strowger invented the first automatic electro-mechanical telephone exchange. It was called the Strowger exchange | |
| Structured Cabling System | A highly flexible cabling topology in which all outlets are cabled individually to a central distribution point - a patch panel - enabling each outlet to be connected to whatever device is required, by a patch lead. This enables moves and changes to be carried out at will | |
| Subscriber | A BT term for a customer who has a connection to a BT exchange | |
| Subscriber Engaged Tone | see ‘Engaged Tone’ | |
| Supplementary Services | see BT Digital Select Services | |
| SVGA | Super Video Graphics Array. A sophisticated display adaptor, suitable for running Windows. Offers mono and colour resolution of 800 x 600 pixels | |
| Swede | A JE of du Pré expression. A flexible word, normally relating to brain power. For example, i) Getting your swede around it - gaining an understanding of ii) Applying some swede to it / give it some swede - give some serious thought to.… iii) He doesn't have the swede for it - the person doesn't understand what you are talking about |
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| Switch | i) A multiport device that increases network performance. e.g., a switch added to the print server can increase bandwidth and reduce congestion ii) The device into which the ISDN runs for distribution within an organisation. Most commonly, the PBX |
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| Switch Hook | The switch on a telephone normally under the handset, such that when the handset is lifted, dial tone is heard - see Hook Flash | |
| Switchband | The wideband service offered by Cable and Wireless | |
| Switching Device | see Switch | |
| Synchronous | Where bits are sent at a fixed rate enabling the receiving equipment to match its clock rate to the incoming stream. Usually for rates > 2,400 bit/s | |
| Synchronous Data Channel | A communications channel capable of transmitting timing information in addition to data | |
| System 7.6 | Apple’s icon based operating system. Apple’s equivalent to Windows ’95 | |
| System Access | Availabe as one of the two forms of access when using BT's ISND2e lines. 'System Access' is provided where the lines are connected to a telephone system via an NTE. In this case, is supported. The other form of access is 'Standard Access' | |
| System X | A particular model of a computer telephone exchange run by a PTO | |
| System Y | A particular model of a computer telephone exchange run by a PTO |