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Info on ISDN/ESS5 Service
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Filename: ISDN.DOC
Uploaded by: Doc Telecom /#66/
Uploaded on: 18 Jul 88 20:59:20 Monday
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******************************************************************** * Doc Telecom *
* *
* presents *
* * * THE TRUTH ABOUT ISDNs *
* *
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Wha's an ISDN ?, is that what you wanted to know well, he defintion for ISDN i Intergrted Servces Digial Networks. All of things out there seem to b quasi-ISNs. For eample man networksprovide itergratedservices over a common digital network i some fashon,like a acket swithing publi data netwrk that prvides lots of diffrent services, (ike electroc mail ,ect and all ofthem providd on a commn backbone you would think surly this ualifies as ntergrated Srvices, sinc data is trasmitted, sury this must e a Digital Network, bt noooo!, tha is just a lage misconn-
cption. For th network to b a true ISDN,it must:
1) Prvide multiple ervices
2) Offr digital intefaces to usersand other netwrks based on IDN stand- ards. <more o these later>.
What are theattributes of IDN ?
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In ISDN thrteen attributesdefine a bearer ervice, broken ito three groups,these attribute re as follows..
Information Tansfer attributes ------------------------------
1 Informatin Transer mode
2 Information Transer Rate
3> Informtion Transfer Capaility
4> Structur
5> stablishment f Comunication
6> Commuication Configuratin
7> Symmetry
Acess attributes
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8> Access chnnel and rate
9> a.Signalling access prtocal
9> b. Infrmaton access protocl
eneral attribute
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10> Suppementary serices provded
11> Quaity of Sevice
12> Inerworking possiblitys 13> optional and commrcial
Circuit-Mode 64-Kbps Unrestricted,8-khz Stuctured
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The cucuitmode, 64-kbps, unretriced, 8-khz structured beaer service provides inforansfer between users wi out any change in bit seam. Users may choose anyapplication for this bt sream, including there wn rivate submultiplexingsysem.(for example 2 PABX <privated automati branchexchange> may use tis servce to transmit, two32kpbs DPCM voice channelsect).
The phras "8kz stuctred" is refered o the inhernt stucture of te info tranfered by an ISDN When one use transmits infoto another usr, the transmiton is accompaied by 8kz timmng info.This akes it posible for users to xchange chracters,8 bit sampls,ect. Witout a user-to-user ychronizaton schee within the circuit.
CircuitMode, 64-kbps, 8khz strctered,Usable for speech
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This is used for peec bearer service and is simiar t he previous one, except that ISN assume the information in the icuit is human speech. An ISDN m oute such a connection in any fahon appropriate for speech - evenoer analog lines.
Circuit-Mde, 4 bits, 8khz Structured, Usabe fo 3.1 khz
Audio information tansfr.
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This differs from the one abve becase this service suport a "3. khZ
udio" rather than peech. Cals with this service may berouted ove analog circuts, and the ntwork stil performs conersion betwee digital incoding laws.
A speech cal may als be routed over pecial multipexing sytems, such as TAI (Time-assignned speeh interpolation) whch uses bursty charcteristics of huan peech to squeeze moe conversations on agiven transmissionsstem.
By distinguising speech and audobearer services, thenetwork can more esily route each all though the appropriae transmition failties
Essential bearr services
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o Circit-mode, 64kbp, 8khz strutured, unrestriced
o Circuitmode, 64kbps 8khz structured speech
o Cicuit-mode, 6kbps, 8khz strucured, 3.1 khz udio
o Pacet-mode, vrtual call and permant virtual cicuits
Aditional bearer servies
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o Circuit-mode alternatespeech/6kbps non speech, 8khz strutured
o Crcuit-moe, 384kbps, 8khz structured unrestriced
o Cicuit-mde, 1536-kbps, 8-khz structured unrestrcted
Ciruit-mode, 1920-kbps, 8khz, structure, unretriced
Well I hope this provides to e usefl, de o the fact I lost my fucking referece matrialThs phile ias uncompleted, but I hope it ha som us..
Doc Telecom
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