``Intuitive ISDN'' ISDN Tutorial WHAT ISDN Integrated Services Di

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

``Intuitive ISDN'' ISDN Tutorial WHAT ISDN Integrated Services Di

Datasheet Thumbnail

Top Searches for this datasheet

``Intuitive ISDN''
``Intuitive ISDN'' ISDN Tutorial
WHAT ISDN Integrated Services Digital Network commonly called ISDN simply digital communications network which offers users variety different capabilities time ISDN will change that many communicate through voice data video communication that ISDN invisible rebuilding existing telephone network that will allow simultaneous voice data communication over ordinary telephone lines What advantages that integrated services digital network will offer order ISDN successful customers must economic payoff associated with ISDN That payoff perceived increased data communications without linear increase costs users network this means that anyone take either telephone personal computer other form data communications equipment plug them directly into standard phone jack gain immediate access number high speed data pipelines user will able dynamically allocate different kbps channels each pieces terminal equipment terminal equipment mean telephones personal computers facsimile machines printers thermostats water meters list goes This revolutionary change will occur without changing existing installed base copper wire CCITT governing body telecommunications standards defines ISDN network evolved from telephony integrated digital network that provides end-to-end digital connectivity support wide variety services which users have access limited standard multipurpose customer interfaces
National Semiconductor Application Note Doug Gremel Poniatowski December 1991
CASE ISDN Without doubt past decade brought hundred fold increase utilization data processing Unfortunately that increase come cost being able effectively communicate share individual data have created isolated islands data processing years telephone exchanges throughout world have taken advantage capabilities digital central office switching This great part help from products such National's COMBOfamily which does analog digital conversion voice signals one's voice conversation converted series added multiplexed with other voice channels several conversations carried simultaneously high speed over single phone wire Presently this analog digital conversion takes place central office switch logical basis ISDN simply move point analog digital conversion from central office subscriber make transmitted signal digital this were accomplished subscriber would able take advantage ability send digital data directly over phone line Since phone network would able distinguish between digital voice generated digital computer generated data common access point both types services created With common access point created phone companies among others will able provide services which customers will Although difficult measure quantitatively resounding increase productivity should enjoyed ISDN's subscribers
ISDN Tutorial
ISDN GOAL Global Connectivity
9318
AN-492
FIGURE Islands Data Processing
COMBOis trademark National Semiconductor Corporation C1995 National Semiconductor Corporation
9318
RRD-B30M115 Printed
It's easy understand phone companies anxious implement ISDN From their point view ISDN represents revenue generating service which takes advantage their large capital investment their existing Telecom network addition ISDN will help them keep customers RBOC's (Regional Bell Operating Companies) presently faced with competitive threat host bi-pass schemes addition Telecommunications industry there also other proponents ISDN data processing industry vested interest making sure that equipment communicate with other pieces equipment Many computer manufacturers have past intentionally tried lock their customers into buying their equipment maintaining proprietary communications architecture This strategy sound while industry infancy users beginning consider benefits open networking scheme there were common communications backbone computer manufacturers would benefit selling more equipment well services proponents ISDN have many different motivating factors supporting worldwide voice data communications network common thread binding ISDN supporters work standardization committees Standards ensure inter-operability among large similar equipment They benefit three distinct groups users network primary advantage being locked into purchase type equipment service provider standards guarantee large user base thus they encourage service provider make investment necessary reap benefits manufacturers building specification enables them produce products wide appeal reduces proprietary nature equipment Along these lines been said that there cornerstones ISDN reasons companies invest ISDN technologies
Cornerstones ISDN will reduce telephone companies costs integrating more services over single access line ISDN represents increased revenue telephone companies ISDN will help proliferate intelligence within beyond network ISDN supports national international standards FIGURE Cornerstones ISDN ISDN IMPLEMENTATION ISSUES concept single access point voice data communication great deal appeal Many experts saying that dawn true information will hand until data communications flow freely Before begin dream what information will hold there several prerequisites that need fulfilled evolution ISDN will actually occur phases first phase complete deployment digital local switching must place digital central office represents backbone network Also ISDN loop terminations will required each potential ISDN subscriber second phase deployment ISDN capabilities will extended between switching offices This requires deployment CCITT's common channel signalling called signalling system third major phase will extension ISDN services between networks This would mean that single world wide network would operational These prerequisites outlined Figure PHASE Digital CO's PHASE PHASE Inter-Networking Digital Trunks
Loop Terminations ISDN Terminal Adaptors FIGURE Evolution ISDN
9318
FIGURE Proponents ISDN
Without compliance standards laid CCITT goal ISDN will realized standards that most interest vendors those dealing with interfaces this point time interface most solidly defined interface complete description interface function outlined CCITT's document Most work standardization body T1D1 presently focused interface Until time that T1D1 standards complete vendors legitimately announce products which ``ISDN compatible'' Rather ISDN exists more press than does reality Even Bell Operating companies decision making process what services will marketed their ISDN networks will implemented this reason Bell Operating companies presently undertaking limited field trials using ``psuedo-ISDN'' services very limited manner These field trials will supply user feedback will greatly help define services Figure time scale ISDN implementation events outlined ISDN Time Scale T1D1 committee concludes definition interface
ISDN TERMINOLOGY DEFINITIONS order convert subscribers connection from analog signal digital termination each copper loop must changed slightly Upon this conversion connection types will offered Basic Primary access Under Basic Access rate each subscriber will entitled channels channel Basic Access each Channel Bearer) represents kbps channel Channel Delta) represents kbps channel minimum transmission rate kbps full duplex transmission therefore required basic access transport Typically basic access subscriber will specific individual subscriber opposed multi-user subscriber such corporation which will require several primary access lines Under Primary Access rate each subscriber United States Japan will able transmit receive over channels channel (23B This data rate compatible with Mbps rate carriers these countries rest world primary access rate offers users channels channel However unlike basic access rate channel primary access represents Kbps channel Figure ISDN reference model basic access connection reference model shows block diagram communications link established diagram blocks represent equipment physical tangible points along phone line Figure Terminal Equipment represent either digital telephone personal computer facsimile machine printer thermostat meter there types terminal equipment terminal which synchronized ISDN network This simply means that terminal equipment manufac-
1987 1987 1988
Limited field trials RBOC's begin T1E1 Committee concludes definition interface 1990 Phase implementation begins some metropolitan areas 1991 ``Services'' defined Field trials complete 1992 Phase implementation underway more metropolitan installations 1995 Phase implementation FIGURE ISDN Time-Scale Implementation
FIGURE ISDN Basic Access Reference Model
9318
tured with intention being compatible with ISDN network other hand terminal which might compatible with ISDN network Because TE2's made before existence ISDN function Terminal Adaptor convert either asynchronous synchronous data from non-ISDN terminals into data which synchronized with ISDN channels data rate must adapted stuffing extra bits into stream prescribed pattern next block model Network Termination terminates network user's wire loop subscribers premises) converts ``U'' interface ``S'' ``T'' interface acts master user's line Just like terminal equipment also Customer Premises Equipment (CPE) will sold through retail outlets (except Europe Canada) Further along model Line Termination Typically consists ``U'' interface transceiver power feeding functions ISDN line card addition various blocks reference point model interfaces between blocks also great interest From users point view these interfaces considered pieces copper wire However interface between blocks that ``intelligence'' resides which enables signal transmitted down line intelligence actually transceiver device which named appropriately after interface function accomplishes There several functions that Interface fulfills addition electrically connecting parallel) TE's with what other functions does interface accomplish basic access rate channels available pieces terminal equipment Part function arbitrate these channels however many TE's reside line Fortunately chances good that will have more than voice phone hanging line Since computers like don't need operated real time interface control phone connection (always circuit switched connection) other pieces terminal equipment share other channels (packet switched connections) user maintain voice connection channels simultaneously transmit data other channels order access channel certain formalities protocols must granted These protocols regulated channel Thus term LAPD Link Access Protocol Channel used describe process attaining connection channel LAPD typically implemented software routine rather than being hardware function When transmitted signals pass through interface they traveling over wire connection This part fact that interface function required arbitration control functions such distance over which interface function limited distance point point configuration which only connected interface specified have range interface fully burdened TE's loop length only 200m attained contrast signals transmitted over interface carried over only wires This fact that
phone company supplies only wires given subscriber will remember considered Customer Premises Equipment (CPE) physically resides wire loop that transmitted signal travels over only wires rather than signal must transmitted both directions simultaneously This transmission technique called Echo Cancellation echo cancellation based transmission signals from transmitted point effectively cancelled from receiver transmitted point therefore receiver will only hear what transmitter line sending This very complex transmission scheme none less such scheme needed transport digital signals required length much NATIONAL SEMICONDUCTORS ROLE ISDN Obviously concept ISDN would possible technological accomplishments these past years heart these advances implementation VLSI integrated circuit technology National Semiconductor will play role evolution towards Integrated Services Digital Network VLSI devices which cost effective solutions must used ISDN going become wide scale economic reality Because much system itself becoming integrated into standard devices National does play role definition standards ISDN Along with this participation standard setting goes willingness comply wholeheartedly with those standards Semiconductor industries' leading supplier dedicated Telecom IC's National excellent position take advantage years experience when implementing ISDN devices this success relationships built over years with customers ongoing dialog necessary define successful products National driving standards through T1E1 involvement National providing basic silicon blocks which will make ISDN practical National providing silicon architecture which will become de-facto standard FIGURE National's Role ISDN developing architecture ISDN chip National's major objective been create flexible building blocks which provide elegant cost-effective solutions wide range applications With just highly integrated devices broad spectrum ISDN equipment designed ranging from Central Office line cards ISDN Terminals telephones terminal adaptors NT's more National's ISDN Chip-Set TP3401 DASL TP3076 COMBO TP3420 TP3410 Echo Canceller HPC16400 Protocol Controller
first device from National TP3420 Interface Device (SID) implements entirely functions outlined CCITT document (which worldwide standard) addition includes noise filtering high resolution digital phase locked loop provide transmission performance excess that specified standard activation channel access sequences handled automatically TP3421 version (GCI interchip protocol popular Europe) also available second National transceiver TP3401 Digital Adapter Subscriber Loops (DASL) DASL cost burst-mode transceiver wire private network loops length DASL functions interface networks that don't have long loop lengths Central Office TP3410 Interface Device third transceiver offered National TP3410 full feature single chip 2B1Q Echo Canceller which capable transmitting data over loop Features include fully automatic adaptive receiver maintenance channel processing programmable time slot assigner This resulted flexible transceiver solution which highly integrated with superior transmission performance National Interface complies full with ANSI 601-1988 standard National also developed 16-bit microcontroller specifically ISDN applications HPC16400 This microcontroller ideally suited ISDN addition 16-bit microcontroller ``core'' contains HDLC controllers (used message processing) board UART (for rate adaption) full channels TP3076 COMBO IIis Programmable CODEC Filter This device features programmable channel gains time slot assignment interface latches support applications requiring voice channels
National's ISDN development boards TP3500 TP3515 allow today's designers prototype their ISDN system quickly efficiently Both data voice calls supported with ability individually exercise each National's ISDN components systems controlled from standard VT100 terminal access provided protocol analyzer National also provides customers with access ISDN Applications Laboratory state ISDN development center ISDN allows customers review debug their design with assistance National's application engineers tools necessary evaluate prototype products available National's ISDN software been developed conjunction with Telenetworks independent software vendor specializing telecommunications software complete software package supported Telenetworks includes training technical support code been developed structured around MTEX real time operating system National also formed alliance with Thomson Microelectronics This means that second source available National's ISDN products future ISDN products developed jointly manufactured separately both companies This results ability quickly respond market trends standards updates while providing customers with advantages true second source short National Semiconductor experience resources products help develop products ISDN today
ISDN Tutorial
100492
``Intuitive ISDN''
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT NATIONAL SEMICONDUCTOR CORPORATION used herein Life support devices systems devices systems which intended surgical implant into body support sustain life whose failure perform when properly used accordance with instructions provided labeling reasonably expected result significant injury user critical component component life support device system whose failure perform reasonably expected cause failure life support device system affect safety effectiveness
AN-492
National Semiconductor Corporation 1111 West Bardin Road Arlington 76017 1(800) 272-9959 1(800) 737-7018
National Semiconductor Europe (a49) 0-180-530 Email cnjwge tevm2 Deutsch (a49) 0-180-530 English (a49) 0-180-532 Fran (a49) 0-180-532 Italiano (a49) 0-180-534
National Semiconductor Hong Kong 13th Floor Straight Block Ocean Centre Canton Tsimshatsui Kowloon Hong Kong (852) 2737-1600 (852) 2736-9960
National Semiconductor Japan 81-043-299-2309 81-043-299-2408
National does assume responsibility circuitry described circuit patent licenses implied National reserves right time without notice change said circuitry specifications

``Intuitive ISDN'' ISDN Tutorial WHAT ISDN Integrated Services Di

Top Searches for this datasheet

Other recent searches