DOCSLIB.ORG

ISDN) the ISDN

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
ISDN) the ISDN Lecture-3 Integrated Services Digital Network (ISDN) The ISDN • The standards for ISDN was defined and developed by ITU-T in 1976. • Set of protocols that combines digital telephony and data transport services. • The whole idea is to digitize the telephone network to permit the transmission of audio, video and text over existing telephone lines. • The goal is to form a WAN that provides universal end- to-end connectivity over digital media. Integrated Digital Network (IDN) • A combination of networks available for different purposes. • Access to these networks is by digital pipes • Digital pipes are time-multiplexed channels sharing very high speed paths. Integrated Services Digital Network (ISDN) • ISDN incorporates all communication connections in a home or building into a single interface. • With ISDN all customer services will become digital rather than analog. Principles of ISDN 1. Support of voice and non-voice applications using a limited set of standardized facilities – Defines the purpose of ISDN and the means of achieving it 2. Support for switched and non-switched applications – Both circuit-switched and packet-switched connections – Support non-switched services in the form of dedicated lines 3. Reliance on 64-kbps connections – Fundamental block of ISDN – 64 kbps were chosen because it was the standard rate for digitized voice 5 Principles of ISDN 4. Intelligence in the network – Sophisticated serviced beyond simple setup a circuit-switched call – Sophisticated network management and maintenance capabilities – Use of SS7 (signaling system 7) and intelligent switching nodes in the network – SS7 is a set of telephony signaling protocols which are used to set up the vast majority of the world's PSTN telephone calls. 5. Layered protocol architecture – User access to ISDN protocol is a layered architecture that can be mapped to OSI model – Standards can be developed independently for various layers and functions 6. Variety of configurations – More than one physical configuration is possible for implementing ISDN 6 The ISDN Network 7 The User Interface •User has access to ISDN via a local interface to a digital “pipe” of certain bit rate. • Pipes of various sizes are available to satisfy different needs • Pipe to the user’s premises has a fixed capacity but the traffic on the pipe may be a variable mix up to the capacity limit. • ISDN requires control signals to instruct how to sort out the time-multiplexed data and provide the required services • Control signals are multiplexed onto the same digital pipe • At any time, the User may employ less than the maximum capacityof thepipe and will bechdharged according to the capacity used rather than “connect time”. Benefits • The principle benefits of ISDN to the customer can be expressed in terms of cost savings and flexibility • Carries a variety of user traffic, such as digital video, data, and telephone network services, using the normal phone circuit- switched network • Integrated voice and data means that the user does not have to buy multip leservices tomeet multip le needs. – Access charges to a single line only – Purchasing services based on actual needs – Product diversity, low price, and wide availability of equipment • Offers much faster call setup than modems by using out-of- band signaling (D channel) • Provides a faster data transfer rate than modems by using the 64-kbps bearer channel (B channel) 9 ISDN Architecture NETE0510: Communication Media and Data 10 Communications ISDN Architecture • The ISDN will su pport a completely new phy sical connector for users, a digital subscriber line and a variety of transmission services. • Physical interface provides a standardized means of attaching to the network that is usable for telephone, computer and videotext terminal. • The interface supports a basic service consisting of three time- multiplexed channels, two at 64 kbps and one at 16 kbps in addition with a ppyrimary service that provide multiple 64-kbps channels. • An interface is defined between the customer’s terminal equipment (TE) and a device on the customer’ s premises, known as a network termination (NT). • The subscriber loop is the physical path from the subscriber’s NT to the ISDN central office that must support full-duplex digital transmission for both basic and primary data rates ISDN Architecture • The ISDN central office is connected to nmerosnumerous su bscriber lines to the digital network that provide various services: • Circuit Switched capabilities- operating at 64kbps and provide the same services like other digital switched telecommunication network. • Non-switched capabilities- one such facility offers a 64kbps dedicated link; but at a higher rate provided by broadband ISDN. • Switched capabilities- high speed(>64kbps) switched connection provide ATM services as part of broadband ISDN. • Packet-switched capabilities- Provides packet switched services. • Frame mode capabilities- a service that support frame relay. • Common channel signaling capabilities- SS7 is used to control the network and provide call management. ISDN Channel Types • ISDN uses bearer or B chlhannels for transm itting dtdata, and a signaling or D (delta) channel for transmitting signaling and control information. • There is also an H channel that is used for transmitting user data at higher transmission rates than the B channel. B chlhannel: • A 64-kbps clear channel used to transmit computer data (text and graphics), digitized voice, and digitized video. • B channel transmissions are either circuit- or packet switched. • Data also can be exchanged via frame relay or through a dedicated leased line arrangement. ISDN Channel Types D chlhannel: • The D channel is either a 16-kbps or 64-kbps channel depending on the specific service level provided. • It is used to carry signal and control information for circuit switched user data. • The D channel transmits information related to call setup and termination between an ISDN device and the Telco's central office for each B channel. • The D channel also can be used to transmit packet-switched user data (provided that no signal or control information is needd)ded), dtdata from securityalarm silignalsof remote sensing devices that detect fire or intruders, and low speed information acquired from telemetry services, such as meter reading. ISDN Channel Types H channel: • The H chlhannel isused for tittitransmitting user data (not signal or control information) at Channel Data higher transmission rates than the B channel Rates provides. (Kbps) • Four H channels are defined: H0, H10, H11, and H12. Bearer (B) 64 • H0 comprises six B chlhannel, for a ttltotal capacity of 384 kbps. Data (D) 16, 64 • The H10 channel is US specific and aggregates 23 B channels for a total capacity of 1.472 Mbps. Hybrid (H) 384 (H0), 1472(H10), • The H11 channel is the equivalent of the North 1536(H11), American DS-1 and consists of 24 B channels 1920(H12) for an aggregate bandwidth of 1.536 Mbps. • The H12 channel, which is European specific, comprises 30 B channels and has an aggregate bandwidth of 1.920 Mbps. Types of Digital Subscriber Loops • Basic Rate Interface (BRI) • Primary Rate Interface (PRI) Basic Rate Interface (BRI) • The ISDN basic rate interface is a 192-kbps channel that consists of two 64-kbps B channels, one 16-kbps D channel, and 48 bits of overhead used for framing and other functions . • BRI provides a full duplex data rate of 128 kbps. • If call or signal information is not being carried by the D channel (e.g., transmitting data via packet-switching), then the rate increases to 144 kbps if the D channel is carrying data. • BRI is appropriate for the home or small office, Primary Rate Interface (PRI) • The PRI has two standard configurations-the first is based on the North American DS1 (1.544-Mbps) format, and the second is based on the European E1 (2.048-Mbps) format. • PRI service is essentially the same as BRI except PRI has 23 (or 30) B channels instead of 2, and PRI's D channel operates at 64 kbps instead of 16 kbps. • In Europe, the PRI ildincludes 30 B chlhannelsand 2 D chlhannels to provide the capacity of 2.048 Mbps( E-1 line). • PRI is more appropriate for organizations that have to provide telecommunication services to a large number of sites. Other channel combinations: – 3H0 + D – 4H0 + D – H12 + D ISDN Components • Terminal Adapter (TA) - Converter device that converts standard electrical signals into the form used by ISDN - allows non-ISDN devices to operate on an ISDN network. • Terminal Equipment Type 1 (TE1) - Compatible with the ISDN network. Example: Telephones, personal computers, fax machine or videocon ferenc ing machine. • Terminal Equipment Type 2 (TE2) - Not compatible with the ISDN network. Example: Analog phone or modem, requires a TA (TE2 connects to TA). • NetworkTerminationType1&2(NT1andNT2)-Asmall connection box that physically connects the customer site to the Telco local loop, provides a four-wire connection to the customer site and a two-wire connection to the network. ISDN Components Network Termination Type1(NT1)- • Controls the physical & electrical termination of the ISDN at the user’s premises. • CtConnects theuser’s itinterna lsystem to the digit a l subibbscriber loop • Organizes the data stream s from a connected subscriber into frames that can be sent over the digital pipe • Translates the frames received from the network into a format usable by the subscriber’s devices. Network Termination Type 2 (NT2)- • Performs functions at the physical (multiplexing), data link (flow contl)trol),netktwork layers (ktii)(packetizing) of the OSI modldel • Provides intermediate signal processing between the data- gggenerating devices and an NT1 • Used primarily to interface between a multiuser system and an NT1 in a PRI. ISDN Components and Reference Points ISDN Reference Points • U-Describes full-duplex data signal on the subscriber line. -Two wire cable that connects the customer’s equipment to the telecommunications provider • R-Point between non-ISDN equipment (TE2) and the TA.
Load more

Recommended publications
  • Cincinnati Bell Telephone Company
    CBTS TECHNOLOGY SOLUTIONS LLC. Nonresidence Service Agreement – Local Telephone Services Section 6 – ISDN PRI A. GENERAL Local ISDN-PRI is provisioned at the 1.544 Mbps rate via the Primary Rate Interface standard of the Integrated Services Digital Network (ISDN). Local ISDN-PRI provides the Customer with the capabilities of simultaneous access, transmission and switching of voice, data and imaging services via channelized transport. B. TERMS AND CONDITIONS 1. Regulations a. ISDN-PRI Service is furnished subject to the availability of suitable facilities and is only served from specially-equipped digital central offices. b. Services from some central offices may not provide all of the features and functionality described in this Service Agreement. c. Local ISDN-PRI Service Arrangement - One or more Service Configurations can be combined to create a Local ISDN-PRI Service Arrangement. Customers may have multiple Local ISDN-PRI Service Arrangements per location, however for each Service Arrangement one Service Configuration 1 must be included. The controlling D channel will always reside on Service Configuration 1. d. The ISDN Digital Facility is ordered separately and not included as part of the Service Configuration. e. The D channel is a 64 Kbps channel that carries signaling and control for the B channels. The capabilities of the D channel are contained within the customer's Service Configuration. f. Service Configuration 1 - The first Service Configuration for any Local ISDN-PRI Service Arrangement must be a Service Configuration 1. Service Configuration I provides twenty-three (23) 64 Kbps B channels and one (1) primary 64Kbps D signaling channel. The primary D channel is an out- of-band signaling channel used to control and route all of the B channel traffic within the Local ISDN- PRI Service Arrangement.
    [Show full text]
  • Service Catalog Facilities Tariff 3
    Service Catalog Tariff No. 3 The services contained in this document are for those exchanges served by TSC’s facilities not found in TSC’s Tariff No. 3. Please see PUCO Tariff No. 3 for additional information. Table of Contents Service Page Numbers • Definitions of Terms 2-13 • General Rules & Regulations 15-17 • Customer Provided Equipment & Facilities 18-21 • Disconnections, Termination or Suspension of Service. 22-23 • Service Charges 24-25 • Local Exchange Service 26-28 • Calling Services 29-30 • Toll Restriction Service 31 • Directory Services 33-36 • Direct Inward Dial Services 37-38 • Centrex Services 39-43 • Dedicated/Private Line Services 44-49 • ISDN PRI Services 50-60 - 1 - Service Catalog Tariff No. 3 DEFINITIONS OF TERMS ACCESS LINE A central office circuit or channel that provides access to the telephone network for local and long distance telephone services. AIR LINE MEASUREMENT The shortest distance between two points. A measurement for computation of mileage charges between termination points. ANCILLARY DEVICES All terminal equipment except telephone instruments, PBX-PABX systems, key systems and data services. ANSWERING EQUIPMENT Equipment that will automatically answer incoming calls and make an announcement. It may also be equipped to record messages. APPLICANT Any person, partnership, corporation, or any combination thereof requesting service or action from the Company. AUTHORIZED PROTECTIVE CONNECTING MODULE A protective unit approved by the Company which is manufactured in accordance with the design set forth in
    [Show full text]
  • ISDN Basic Rate Interface Product Description
    Meridian 1 and Succession Communication Server for Enterprise 1000 ISDN Basic Rate Interface Product Description Document Number: 553-3901-100 Document Release: Standard 8.00 Date: January 2002 Year Publish FCC TM Copyright © 1992–2002 Nortel Networks All Rights Reserved Printed in Canada Information is subject to change without notice. Nortel Networks reserves the right to make changes in design or components as progress in engineering and manufacturing may warrant. This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC rules, and the radio interference regulations of Industry Canada. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy, and if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at their own expense. SL-1, Meridian 1, and Succession are trademarks of Nortel Networks. 4 Page 3 of 110 Revision history January 2002 Standard 8.00. This document is up-issued to include content changes for Meridian 1 Release 25.40 and Succession Communication Server for Enterprise 1000 Release 1.1. April 2000 Standard 7.00. This is a global document and is up-issued for X11 Release 25.0x. Document changes include removal of: redundant content; references to equipment types except Options 11C, 51C, 61C, and 81C; and references to previous software releases.
    [Show full text]
  • Residential Intellilinq BRI Service Is No Longer Available to New Customers
    VERIZON MARYLAND LLC GENERAL SERVICES PRODUCT GUIDE Part C Section 14B Original Page 1 RESIDENTIAL IntelliLinQ® BRI SERVICE * A. GENERAL Residential IntelliLinQ® BRI Service is an optional service arrangement that uses the Basic Rate Interface (BRI) Arrangement of the Integrated Services Digital Network (ISDN). B. TERMS AND CONDITIONS 1. Explanation of Terms Basic Rate Interface (BRI) Arrangement The BRI Arrangement provides ISDN capabilities from an ISDN equipped switch in the central office. The BRI Arrangement consists of two "B" (Bearer) channels and one "D" channel (2B+D) which are defined as: B Channel The B channel is a 64 kilobit per second (kbps) channel used for information transfer between users. The B channel may be used in conjunction with circuit-switched service. D Channel The D channel is a 16 kilobit per second packet-switched channel that carries signaling and control for the B channels. Circuit Switching Circuit Switching is a switching technique in which an entire circuit or, in a digital switch equipped for ISDN, a specific selection of time slots is dedicated to a given call. * Effective December 20, 2004, Residential IntelliLinQ BRI Service is no longer available to new customers. Moves, additions or changes to subscribers’ existing service are not permitted. Effective: September 1, 2015 VERIZON MARYLAND LLC GENERAL SERVICES PRODUCT GUIDE Part C Section 14B Original Page 2 RESIDENTIAL IntelliLinQ® BRI SERVICE* B. TERMS AND CONDITIONS (Cont'd) 1. Explanation of Terms (Cont'd) Integrated Services Digital Network Integrated Services Digital Network (ISDN) describes the end-to-end digital telecommunications network architecture which provides for the simultaneous access, transmission and switching of voice, data and image services.
    [Show full text]
  • Design of an ISDN Central Office, U-Interface Timothy N
    Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1991 Design of an ISDN central office, U-interface Timothy N. Toillion Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Digital Circuits Commons, Digital Communications and Networking Commons, and the Signal Processing Commons Recommended Citation Toillion, Timothy N., "Design of an ISDN central office, U-interface" (1991). Retrospective Theses and Dissertations. 16968. https://lib.dr.iastate.edu/rtd/16968 This Thesis is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. Design of an ISDN central office, U-interface by Timothy N. Toillion A Thesis Submitted to the Graduate Faculty in Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE Department: Electrical Engineering and Computer Engineering Major: Computer Engineering Signatures have been redacted for privacy Signatures have been redacted for privacy Iowa State University Ames, Iowa 1991 Copyright @ Timothy N. Toillion, 1991. All rights reserved. 11 TABLE OF CONTENTS INTRODUCTION. .. 1 CHAPTER 1. THE EVOLUTION OF TELECOMMUNICATIONS 4 Telephone Communications .. 4 Inventions Spawn Growth 4 Modern Telecommunication Networks. 8 Telecommunications ......... 11 Definition of Telecommunication. 11 Other Forms of Telecommunication 11 Integration of Services . 12 Evolution of the Concept . 12 The Evolution of ISDN .. 15 CCITT's Standards . 15 Major Set back. 16 Evolution of Products and Services 16 CHAPTER 2.
    [Show full text]
  • Global Call ISDN Technology Guide
    Global Call ISDN Technology Guide November 2003 05-2242-001 INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL® PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. Intel products are not intended for use in medical, life saving, or life sustaining applications. Intel may make changes to specifications and product descriptions at any time, without notice. This Global Call ISDN Technology Guide as well as the software described in it is furnished under license and may only be used or copied in accordance with the terms of the license. The information in this manual is furnished for informational use only, is subject to change without notice, and should not be construed as a commitment by Intel Corporation. Intel Corporation assumes no responsibility or liability for any errors or inaccuracies that may appear in this document or any software that may be provided in association with this document. Except as permitted by such license, no part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means without express
    [Show full text]
  • CSP Developer's Guide: Common Channel Signaling
    Converged Services Platform Developer’s Guide: Common Channel Signaling Release 8.3.1 Controlled Introduction January 2005 Important Notice ............................................................................................................................................................................................................................................................ Disclaimer The contents of this document are subject to change without notice; therefore, the information presented herein shall not be construed as a commitment or warranty. Excel Switching Corporation shall not be liable for any technical or editorial errors or omissions contained herein or for incidental or consequential damages resulting from the performance, furnishing, reliance on, or use of this material. Patents Certain equipment and software described in this document is protected by issued and pending U.S. and foreign patents. All products and services are trademarks or registered trademarks of their respective manufacturer. Copyright This document contains confidential and proprietary information protected by copyright. All rights reserved. Copying or other reproduction of all or parts of this document is prohibited without the permission of Excel Switching Corporation. Copyright 2005 by Excel Switching Corporation. Technical Support 800-541-7002 (within the United States) 508-862-3366 (international) 508-862-3351 (Fax) Release 8.3.1 CI, January 2005 ii Comments and Suggestions ...........................................................................................................................................................................................................................................................
    [Show full text]
  • CS1000 ISDN Basic Rate Interface Feature Fundamentals
    Nortel Communication Server 1000 ISDN Basic Rate Interface Feature Fundamentals NN43001-580 . Document status: Standard Document version: 01.02 Document date: 20 June 2007 Copyright © 2003-2007, Nortel Networks All Rights Reserved. Sourced in Canada The information in this document is subject to change without notice. The statements, configurations, technical data, and recommendations in this document are believed to be accurate and reliable, but are presented without express or implied warranty. Users must take full responsibility for their applications of any products specified in this document. The information in this document is proprietary to Nortel Networks. Nortel, the Nortel Logo, the Globemark, SL-1, Meridian 1, and Succession are trademarks of Nortel Networks. All other trademarks are the property of their respective owners. 3 Revision history June 2007 Standard 01.02. This document is up-issued to remove the Nortel Networks Confidential statement. May 2007 Standard 01.01. This document is issued to support Communication Server 1000 Release 5.0. This document contains information previously contained in the following legacy document, now retired: ISDN Primary Rate Interface Features (553-3001-369). August 2005 Standard 3.00. This document is up-issued to support Communication Server 1000 Release 4.5. September 2004 Standard 2.00. This document is up-issued for Communication Server 1000 Release 4.0. October 2003 Standard 1.00. This document is a new NTP for Succession 3.0. It was created to support a restructuring of the Documentation
    [Show full text]
  • Integrated Services Digital Network
    ISDN Integrated Services Digital Network • definition of ISDN • evolution to ISDN and beyond •ISDN services • basic BRA / PRA architecture • protocols & signalling What is ISDN ? 1. End-to-end digital connectivity IdeaIdea originatedoriginated inin thethe 1980’s1980’s 2. Enhanced subscriber signaling 3. A wide variety of new services (due to 1 and 2) 4. Standardized access interfaces and terminals ISDN is not a “new” network separated from the PSTN. Interworking with “normal” PSTN equipment is very important. interaction is ISDNISDN possible PSTNPSTN terminalterminal terminalterminal Evolution towards ISDN and beyond How does ISDN fit into the telecom network evolution in general? 1. First the network was all-analogue and voice-centric 2. Digital transmission (PDH) in the core network 3. Digital switching at 64 kbit/s 4. SS7 replaces channel associated signalling systems 5. SDH replaces PDH 6. ISDN offers digital technology to end users 7. DSL (primarily ADSL) technology takes over Evolution history Step 1: All-analogue network (before 1960) TransmissionTransmission SwitchingSwitching EndEnd users users Evolution history Step 2: Digital transmission in the core network (1960 - 1980) PDH transmission systems (2 - 140 Mbit/s) Evolution history Step 3: Digital switching at 64 kbit/s (1970 - 1990) TDM switching technology Evolution history Step 4: Common Channel Signalling in the core network (1980 - 2000) SS7 Evolution history Step 5: PDH systems are replaced by SDH systems (1990 ...) SDH transmission systems (155, 620 Mb/s) Evolution history Step 6: ISDN => digital technology to end users End-to-end digital user data End-to-end digital signalling Evolution history Step 7: ADSL (for Internet services) + analogue voice High speed Internet access (Back to) traditional voice services Mobile systems PSTN vs.
    [Show full text]
  • Primary Rate Interface (ISDN-PRI) Service
    TELUS GENERAL TARIFF CRTC 18001 Communications Inc. 3rd Revision Cancels 2nd Revised Page 395 ITEM 495 Integrated Services Digital Network-Primary Rate Interface (ISDN-PRI) Service ITEM 495.1 Service Description ISDN-PRI Service provides for multiple 64-Kbps digital local access channels to Customers’ ISDN- compatible terminal equipment for integrated switched or dedicated access with TCI’s public network services, or private-line services, for voice and non-voice communications. The Service is based on CCITT’s ISDN PRI standard. ISDN-PRI Service consists of a minimum of twenty-three (23) 64-Kbps digital information channels (B channels) and one (1) 64-Kbps signaling channel (D channel). Note: Effective 2005 02 03, Canadian Carriers and registered Resellers see also Competitor Digital N Network (CDN) Services in TCI Carrier Access Tariff (CRTC 21462), Item 224, if | applicable. | ITEM 495.2 Definitions For the purpose of this Tariff : “Access” or “Access Channel” means the digital DS-1 or DS-0 (B-Channel) local channel facilities between the ISDN-serving Central Office and the Network Interface Demarcation Point at the Customer’s premises. “B-Channel” provides for a 64-Kbps access channel for the Customer’s voice or data communications. “Call Display” is a service feature, which delivers the Customer’s Calling Line Identification to a called station, or that of a calling station to the Customer. “Calling Line Identification” means one of the following which identifies a calling station to the called station: a. The billing telephone number of the Customer’s ISDN-PRI Service; b. Alternate Number Delivery, Call Management Services (General Tariff (CRTC 21461), Item 300); or c.
    [Show full text]
  • Integrated Services Digital Network (ISDN)
    ETSI ETR 343 TECHNICAL March 1997 REPORT Source: ETSI TC-TE Reference: DTR/TE-02042 ICS: 33.020 Key words: ISDN, lower layer, protocol, satellite, terminal Integrated Services Digital Network (ISDN); Extended lower layer protocols; Definition of B and D Channel protocols with proposed Requirements List (RL) and profile specific Implementation Conformance Statement (ICS) ETSI European Telecommunications Standards Institute ETSI Secretariat Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [email protected] Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16 Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. © European Telecommunications Standards Institute 1997. All rights reserved. Page 2 ETR 343: March 1997 Whilst every care has been taken in the preparation and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to "ETSI Editing and Committee Support Dept." at the address shown on the title page. Page 3 ETR 343: March 1997 Contents Foreword .......................................................................................................................................................9 Introduction....................................................................................................................................................9
    [Show full text]
  • Basic Rate Interface (Bri) Service* (N) A
    VERIZON MARYLAND LLC GENERAL SERVICES PRODUCT GUIDE Part C Section 13N 1st Revised Page 1 Cancels Original Page 1 CENTREX intellilinq*-BASIC RATE INTERFACE (BRI) SERVICE* (N) A. GENERAL Centrex INTELLILINQ-Basic Rate Interface (BRI) is an optional service arrange- ment for use with Centrex Services. INTELLILINQ-BRI uses the BRI arrangement of the Integrated Services Digital Network (ISDN). The terms and conditions, rates and charges contained herein are in addition to the applicable Centrex Service arrangements specified in this Product Guide. B. TERMS AND CONDITIONS 1. Explanation of Terms Basic Rate Interface (BRI) Arrangement INTELLILINQ-BRI Arrangement provides ISDN capabilities from an ISDN equipped switched in the central office. The BRI Arrangement consists of two "B" channels and and one "D" channel (2B+D) which are defined as: B Channel The B channel is a 64 kilobit per second (kbps) channel used for information transfer between users. The B channel may be used in conjunction with circuit switching service. D Channel The D channel is a 16 kilobit per second packet-switched channel that carries signaling and control for the B channels. The D channel also supports customer packet traffic at speeds up to 9.6 kbps. Circuit Switching A switching technique in which an entire circuit or, in an ISDN digital switch, a specific selection of time slots is dedicated to a given call. Featured Voice INTELLILINQ-BRI Access Featured Voice INTELLILINQ-BRI Access uses only one B Channel of the ISDN architecture. In addition to providing voice access, it also provides the customers with the Electronic Key Features described in B.5., following.
    [Show full text]