NIS-A211-1 Digital Switching Systems ISDN Primary Rate User-Network Interface Specification NA011 Standard 08.01 August 1998 ii Notice This specification is provided as a guide for network planners and suppliers of systems and equipment designed to meet the requirements of Northern Telecom’s DMS-100 NA011 Primary Rate Interface specification. Northern Telecom reserves the right to revise the contents of this specification for any reason, including, but not limited to, conformity with standards promulgated by any public standards agency, advances in technology, or to reflect changes in requirements of communication networks, systems, or applications. Northern Telecom makes no representation with respect to and does not warrant the technical information contained in this specification including, without limitation, any warranty as to fitness for a particular purpose or merchantability or against infringement of patents, copyrights, trademarks, or other intellectual property rights. The provision of any capabilities described in this document is dependent on certain business decisions, resolution of which may result in changes to, withdrawal of, or addition to, any or all of the capabilities herein. Receipt and use of the technical information contained in this specification by recipient shall constitute agreement by recipient that it waives any claims it might have against Northern Telecom as a consequence thereof and that in no event shall Northern Telecom be liable for any special, indirect, incidental, or consequential damages of any nature whatsoever. Specification: NIS-A211-1 Standard release 08.01 August 1998 Digital Switching Systems ISDN Primary Rate User-Network Interface Specification Publication number: NIS-A211-1 Product release: NA011 Document release: Standard release 08.01 Issue date: August 1998 1997 Northern Telecom All rights reserved. Printed in the United States and Canada. Information subject to change without notice. The information disclosed herein is proprietary to Northern Telecom or others and is not to be used by or disclosed to unauthorized persons without the written consent of Northern Telecom. The recipient of this document shall respect the security status of the information. ISDN Primary Rate User-Network Interface Specification iv Publication History January 1993 BCS35 Standard NIS A211-1 Release 5 January 1994 BCS36 Preliminary NIS A211-1 Release 6 • New ISDN PRI functionality has been added as described below: Cause Screening A screening facility has been added to map locally significant causes received by the terminating interface to more generalized ones. Inband Treatment Subscription A capability has been added to provide inband treatment for calls originating on a PRI interface. March 1994 BCS36 Standard NIS A211-1 Release 6 • A number of minor technical changes have been made in this release. May 1997 NA007 Standard NIS A211-1 Release 7 • New ISDN PRI functionality has been added as described below. Release Link Trunk (RLT) RLT is a feature available on an optionality basis which optimizes the usage of NTNA PRI trunks. CPN Screening The actions on receipt of a call setup request from a PRI user is dependent on the values of the Screening Indicator (SI) in the Calling party number information element (CPN). • A number of additional minor technical changes have been made in this release. Specification: NIS-A211-1 Standard release 08.01 August 1998 August 1998 NA011 Standard NIS A211-1 Release 8 A number of minor technical changes have been made in this release. ISDN Primary Rate User-Network Interface Specification vi Specification: NIS-A211-1 Standard release 08.01 August 1998 v Table of Contents About this specification xvii 1- Section 1: Introduction 1-1 Chapter 1-1: Overview of PRI 1-3 1.1 PRI structure 1-3 1.2 Network configurations 1-3 1.3 Connection types 1-5 1.3.1 Switched connections 1-5 1.3.2 Permanent connections 1-5 1.4 Bearer services 1-5 1.4.1 Voice terminal connectivity 1-5 1.4.2 Digital data terminal connectivity 1-7 1.4.3 Packet handler access 1-8 1.4.4 Frame relay access 1-9 1.5 Numbering plans and dialing plans 1-9 1.5.1 Numbering plans 1-9 1.5.2 Dialing plans 1-10 1.5.3 Conversion of a dialing plan to a numbering plan 1-10 1.6 Basic connection service 1-11 1.6.1 Selection of connection facilities 1-13 1.6.2 Progress reporting and cut-through 1-13 1.6.3 Conversion of a dialing plan into a network numbering plan 1-14 1.6.4 Channel allocation 1-16 1.7 Supplementary services 1-16 2- Section 2: Layer 1 specification for primary rate interfaces 2-1 Chapter 2-1: Layer 1 introduction 2-3 1.1 Technical conformance 2-3 1.2 Standards compatibility 2-4 Chapter 2-2: Layer 1 general information 2-5 2.1 Architecture 2-5 2.2 Services offered by the physical layer 2-6 ISDN Primary Rate User-Network Interface Specification vi Contents 2.3 Layer 1 signaling 2-7 Chapter 2-3: Layer 1 electrical specification 2-9 3.1 Introduction 2-9 3.2 Impedance matching 2-10 3.3 Signal specifications 2-10 3.3.1 Transmission rate 2-10 3.3.2 Line codes 2-10 3.3.3 Test load 2-10 3.3.4 Standard pulse characteristics 2-10 3.3.5 60 Hz variations in pulse amplitude 2-12 3.4 Signal from the carrier (carrier signal) 2-12 3.5 Signal from the customer installation (CI signal) 2-13 3.6 Pulse density 2-13 3.7 Jitter and wander 2-13 3.7.1 Jitter 2-13 3.7.2 Wander 2-14 3.8 Powering arrangements 2-14 Chapter 2-4: Layer 1 frame formats 2-15 4.1 Introduction 2-15 4.2 Frame format definition 2-15 4.3 Superframe format definition 2-16 4.4 Extended superframe format 2-17 4.5 Idle codes 2-19 4.5.1 Codes for idle channels and idle slots 2-19 4.5.2 Interframe (layer 2) timefill 2-19 Chapter 2-5: Layer 1 clear channel capability 2-21 5.1 Clear channel capability 2-21 Chapter 2-6: Layer 1 maintenance 2-23 6.1 Remote alarm indication 2-23 6.2 Alarm indication signal (AIS) 2-23 6.3 Loopback 2-23 6.4 ESF maintenance 2-24 6.4.1 Introduction 2-24 6.4.2 Transmission measurement parameters 2-25 6.4.3 ESF data link 2-26 6.4.4 ESF bit-oriented data link communication 2-27 Chapter 2-7: Layer 1 connector arrangements 2-29 7.1 Connector arrangements 2-29 3- Section 3: Layer 2 specification for primary rate interfaces 3-1 Specification: NIS-A211-1 Standard release 08.01 August 1998 Contents vii Chapter 3-1: Introduction to Layer 2 3-5 1.1 Scope 3-5 1.2 Feature summary 3-5 1.3 Standards compatibility 3-6 1.4 Overview description of LAPD functions and procedures 3-6 1.5 Protocol service definition 3-7 1.5.1 Services provided to Layer 3 3-7 1.5.2 Administrative services 3-8 Chapter 3-2: Layer 2 frame structure 3-9 2.1 Introduction 3-9 2.2 Flag sequence 3-10 2.3 Address field 3-10 2.4 Control field 3-11 2.5 Information field 3-11 2.6 Transparency 3-11 2.7 Frame checking sequence (FCS) field 3-11 2.8 Format convention 3-12 2.8.1 Numbering convention 3-12 2.8.2 Order of bit transmission 3-12 2.8.3 Field mapping convention 3-12 2.9 Invalid frames 3-13 2.10 Frame abort 3-14 Chapter 3-3: Layer 2 elements of procedures 3-15 3.1 Introduction 3-15 3.2 Address field format 3-15 3.3 Address field variables 3-16 3.3.1 Address field extension bit (EA) 3-16 3.3.2 Command response field bit (C/R) 3-16 3.3.3 Service access point identifier (SAPI) 3-16 3.3.4 Terminal end-point identifier (TEI) 3-17 3.4 Control field formats 3-17 3.4.1 Information transfer format — I 3-18 3.4.2 Supervisory format — S 3-18 3.4.3 Unnumbered format — U 3-19 3.5 Control field parameters and associated state variables 3-19 3.5.1 Poll/final (P/F) bit 3-19 3.5.2 Multiple frame operation — variables and sequence numbers 3-20 3.6 Frame types 3-23 3.6.1 Commands and responses 3-23 3.6.2 Information (I) command 3-23 3.6.3 Set asynchronous balanced mode extended (SABME) command 3-23 3.6.4 Disconnect (DISC) command 3-23 3.6.5 Unnumbered information (UI) command 3-24 3.6.6 Receive ready (RR) command and response 3-24 ISDN Primary Rate User-Network Interface Specification viii Contents 3.6.7 Reject (REJ) command and response 3-24 3.6.8 Receive not ready (RNR) command and response 3-25 3.6.9 Unnumbered acknowledgment (UA) response 3-25 3.6.10 Disconnected mode (DM) response 3-25 3.6.11 Frame reject (FRMR) response 3-25 3.6.12 Exchange identification (XID) command/response 3-27 Chapter 3-4: Layer 2 elements for layer-to-layer communication 3-29 4.1 Introduction 3-29 4.2 Interface 3-29 4.3 Generic names 3-29 4.3.1 DL-Establish 3-30 4.3.2 DL-Release 3-30 4.3.3 DL-DM-Release 3-30 4.3.4 DL-Data 3-30 4.3.5 MDL-Assign 3-31 4.3.6 MDL-Remove 3-31 4.3.7 MDL-Error 3-31 4.3.8 PH-Data 3-31 4.4 Primitive types 3-31 4.4.1 Request 3-31 4.4.2 Indication 3-31 4.4.3 Response 3-32 4.4.4 Confirm 3-32 4.5 Parameter definition 3-32 4.5.1 Priority indicator 3-32 4.5.2 Message unit 3-32 4.6 Primitive procedures 3-32 Chapter 3-5: Definition of peer-to-peer procedures for Layer 2 3-35 5.1 Procedure for use of the P/F bit 3-35 5.1.1 Unacknowledged information transfer 3-35 5.1.2 Acknowledged multiple-frame information transfer 3-35 5.2 Procedures for unacknowledged information transfer 3-36 5.3 Terminal endpoint identifier (TEI) management procedures 3-36 5.4 Automatic negotiation of data-link-layer parameters 3-36 5.5 Procedures for establishment and release of multiple frame operation 3-36 5.5.1 Establishment of multiple frame operation 3-36 5.5.2 Information transfer 3-38 5.5.3 Termination of multiple frame operation 3-38 5.5.4 TEI-assigned state 3-40 5.5.5 Collision of unnumbered commands and responses 3-40 5.5.6 Unsolicited DM response and SABME or DISC command 3-40 5.6 Procedures for information transfer in multiple frame operation 3-41 5.6.1