SIST ETS 300 324-1:1997

• Abstract:

  Elec, phys, procedural, protocol reqs for V i/f betw Access n/w & LE for support of: analogue telephone; ISDN br with line txn i/f or u-n i/f @ user side - with flexible info chan (B chan) alloc n during pro- visioning, without concentration in access n/w. Permanent leased ccts &c bypassing LE excluded. Ax n/w not included; nor implemenation.

• Status: Published
• Publication Date: 31-Oct-1997
• ICS: 33.040.30 - Switching and signalling systems
• Technical Committee: SPS - Signalling protocols and switching
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Nov-1997
• Due Date: 01-Nov-1997
• Completion Date: 01-Nov-1997
• Ref Project: ETSI ETS 300 324-1 ed.1 (1994-02) - V interfaces at the digital Local Exchange (LE); V5.1 interface for the support of Access Network (AN); Part 1: V5.1 interface specification

SIST ETS 300 324-1:1997 is the Slovenian adoption of ETS 300 324-1 Edition 1 from ETSI. It specifies the V5.1 interface between an Access Network (AN) and a Local Exchange (LE), including the electrical, physical, procedural and protocol rules needed to carry PSTN signalling, ISDN basic access and related control functions. In practice, it is the document you use when designing, configuring or checking a V5.1 interface for analogue and ISDN access support.

What does SIST ETS 300 324-1:1997 specify?

SIST ETS 300 324-1:1997 specifies the interface between an AN and an LE, not the internal implementation of the AN. It defines how the V5.1 interface carries bearer channels, ISDN D-channel information, PSTN signalling information and control information over a single 2 048 kbit/s link.

The scope covers analogue telephone access, ISDN basic access with a line transmission system or a user network interface at the T reference point, and other analogue or digital accesses for semi-permanent connections without outband signalling and without concentration in the AN. Permanent leased circuits that bypass the LE are excluded from the interface scope, while semi-permanent leased lines are included through provisioning.

The document is organised as follows:

• Clauses 4 and 5 define the electrical, physical and procedural interface requirements.
• Clause 6 describes supported service types and the access scenarios.
• Clause 7 covers control and provisioning.
• Clauses 8 to 12 define the protocol architecture, multiplexing and layer-to-layer mapping.
• Clause 13 specifies PSTN signalling.
• Clause 14 specifies user port control, layer 1 maintenance and re-provisioning.
• Annexes provide supporting requirements, examples, state machines, coding rules and diagrams.

Annex	What it covers
A	Permanent lines in ISDN basic access
B	Semi-permanent leased lines and related assumptions
C	Basic system management requirements in AN and LE
D	Use of protocol information elements for national PSTN protocols
E	Service scenarios and architecture for access arrangements with AN at the LE
F	Concept and requirements for upgrading a V5.1 interface to V5.2
G	Function element primitives used in the V5 PSTN protocol
H	Explanatory notes and information flow diagrams for PSTN signalling
J	AN requirement for pulse dialling
K	Layer 3 PSTN protocol error detection
L	SDL diagrams for the AN and LE sides
M	Frame formats used in the V5.1 interface
N	Protocol architecture for PSTN and ISDN user port control
P	Items identified to be pre-defined or provisioned
Q	Bibliography

What are the key requirements of SIST ETS 300 324-1:1997?

SIST ETS 300 324-1:1997 sets the V5.1 interface as a structured 2 048 kbit/s interface with defined channel use, protocol layers and control procedures. The practical effect is that AN and LE equipment must interoperate in a controlled way for bearer traffic, signalling and port control.

Interface and channel allocation

Clauses 4 and 5 require the V5.1 interface to use the 2 048 kbit/s case defined in ETS 300 166 and ETS 300 167, including CRC-4 procedure and CRC error reporting. The interface presentation can be balanced pair or coaxial, so the operator chooses the physical presentation needed for the deployment.

Clause 8 fixes the use of timeslots 1 to 31 for provisioned channels. Communication channels are allocated in a defined way: one channel uses timeslot 16, two channels use 15 and 16, and three channels use 15, 16 and 31. In practice, this matters because provisioning must match the channel plan used by the AN and LE.

Supported service types

Clause 6 groups supported services into on-demand services, Permanent Line (PL) capability, semi-permanent leased lines and permanent leased line services. PL capability uses one or both B-channels of ISDN basic access and bypasses the LE; semi-permanent leased lines pass through the V5.1 interface and are supported by the standard's procedures; permanent leased line services bypass the LE and have no effect on the interface.

For the reader, this means the standard distinguishes between services that traverse the V5.1 interface and services that do not. That distinction affects provisioning, control, and where signalling is handled.

Layer 2 structure and multiplexing

Clause 8 splits layer 2 into the LAPV5 Envelope Function sublayer (LAPV5-EF) and the LAPV5 Data Link sublayer (LAPV5-DL), and adds the AN frame relay function (AN-FR) in the AN for ISDN D-channel information. The mapping function controls movement between these sublayers.

Clause 9 defines LAPV5-EF frame structure, including flag sequence, address field, information field, transparency and Frame Check Sequence (FCS). Clause 10 defines LAPV5-DL frames, address and control fields, TEI management, automatic negotiation, multiple-frame operation and error recovery. Invalid frames are discarded.

AN frame relay for ISDN D-channel traffic

Clause 11 says the AN does not fully terminate the customer's D-channel data link layer protocol. Instead, AN-FR relays frames after checking frame integrity, multiplexes them using the ISDN layer 2 address, inserts flags when no frames need to be sent, and detects transmission errors.

This matters because the AN must pass D-channel traffic correctly without behaving like a full protocol endpoint. It also defines which invalid frames are dropped without notification.

PSTN signalling and error handling

Clause 13 defines PSTN protocol messages, information elements, path states and timers. The message set includes ESTABLISH, ESTABLISH ACK, SIGNAL, SIGNAL ACK, STATUS, STATUS ENQUIRY, DISCONNECT, DISCONNECT COMPLETE and PROTOCOL PARAMETER. Clause 13 also defines coding rules for information elements, message handling, path initiation, path collision, port blocking, restart and layer 3 error detection.

Annex K adds the layer 3 error detection mechanism, including sequential numbering of SIGNAL messages and the associated counters and timers. For practical use, this is the part that supports reliable signalling over the V5.1 interface.

Port control, maintenance and re-provisioning

Clause 14 defines the control requirements and finite state machines for ISDN user port status control, PSTN user port status control, layer 1 maintenance and the control protocol. It also defines PORT CONTROL, COMMON CONTROL and their acknowledgements, plus re-provisioning procedures such as Request variant and ID, Verify re-provisioning, Re-provisioning synchronization and Restart.

In practice, this clause is the operational side of the interface: blocking, unblocking, state indication, fault handling and changes to the configured service variant.

What terms does SIST ETS 300 324-1:1997 define?

• Access Network (AN) - A system between the LE and the user that replaces part or all of the local line distribution network.
• Local Exchange (LE) - The exchange side of the V5.1 interface, paired with the AN in the interface procedures.
• Permanent Line (PL) capability - An ISDN B-channel arrangement that bypasses the LE.
• LAPV5-EF - The Envelope Function sublayer of LAPV5, used for peer-to-peer frame handling on the communication channels.
• LAPV5-DL - The Data Link sublayer of LAPV5, used for peer-to-peer data link procedures and multiple-frame operation.
• AN-FR - The AN frame relay function used in the AN for ISDN D-channel information.
• FE - Function Element primitives used in the PSTN protocol path and port control procedures.

Who uses SIST ETS 300 324-1:1997?

SIST ETS 300 324-1:1997 is used by network operators, AN and LE equipment manufacturers, system integrators, and test or conformance engineers. Operators use it to plan provisioning, service support and port control behaviour. Equipment designers use it to implement the physical interface, protocol layers and state machines. Quality managers and buyers use it to check whether an AN or LE product is built for V5.1 interoperability and the supported access types.

What changed in SIST ETS 300 324-1:1997 from the previous edition?

SIST ETS 300 324-1:1997 corresponds to ETS 300 324-1 Edition 1.

Which standards are used with SIST ETS 300 324-1:1997?

• ETS 300 166 - Provides the 2 048 kbit/s physical and electrical interface characteristics used by Clause 4.
• ETS 300 167 - Provides the functional and procedural requirements for the 2 048 kbit/s case, including the CRC-4 procedure used by Clause 5.
• ETS 300 297 - Provides the line transmission system used for one ISDN basic access case in the scope.
• ETS 300 012 - Provides the user network interface at the T reference point for ISDN basic access.
• ETS 300 125 - Provides the LAPD basis for LAPV5 in Clauses 9 and 10.
• ETS 300 102 - Provides the D-channel protocol used in Annex B for ISDN user-to-user signalling.
• ETS 300 324-2 - The protocol implementation conformance statement for the V5.1 interface.
• ETS 300 324-3 - The test suite structure and test purposes for the V5.1 interface.
• ETS 300 347-1 - The V5.2 interface part of the same V5 access network family.
• ETS 300 347-2 - The protocol implementation conformance statement for the V5.2 interface.

What does the SIST ETS 300 324-1:1997 document contain?

SIST ETS 300 324-1:1997 contains the full V5.1 interface specification, including layer 1, layer 2 and layer 3 behaviour. It gives message formats, information element coding, frame formats, protocol state tables, timers and error handling rules for PSTN and control traffic. The annexes add worked protocol guidance, system management requirements, SDL diagrams, mapping rules and example signalling cases. For implementation and testing work, the document provides the operational detail needed to build interoperable AN and LE behaviour without reproducing the full normative text here.

SLOVENSKI STANDARD
01-november-1997
Signalizacijski protokoli in komutacija (SPS) - Vmesniki "V" pri digitalnih krajevnih
centralah (LE) - Vmesnik V5.1 za podporo dostopovnega omrežja (AN) - 1. del:
Specifikacija vmesnika V5.1
V interfaces at the digital Local Exchange (LE); V5.1 interface for the support of Access
Network (AN); Part 1: V5.1 interface specification
Ta slovenski standard je istoveten z: ETS 300 324-1 Edition 1
ICS:
33.040.30 Komutacijski in signalizacijski Switching and signalling
sistem systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 324-1
TELECOMMUNICATION February 1994
STANDARD
Source: ETSI TC-SPS Reference: DE/SPS-03003.1
ICS: 33.080
V interface, V5 interface, LE, AN
Key words:
Signalling Protocols and Switching (SPS);
V interfaces at the digital Local Exchange (LE)
V5.1 interface for the support of Access Network (AN)
Part 1: V5.1 interface specification
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
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 1994. All rights reserved.
New presentation - see History box

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ETS 300 324-1: February 1994
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.

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ETS 300 324-1: February 1994
Contents
Foreword .13
Introduction.13
1 Scope .15
2 Normative references.16
3 Definitions, symbols and abbreviations.16
3.1 Definitions .16
3.2 Symbols and abbreviations.19
4 Electrical and physical interface requirements.21
5 Procedural interface requirements.21
6 Services and architecture aspects and requirements .21
6.1 On-demand services.21
6.1.1 PSTN.21
6.1.2 ISDN basic access .22
6.2 Permanent Line (PL) capability.22
6.3 Semi-permanent leased line .22
6.4 Permanent leased line services.23
7 Control and provisioning.23
7.1 Control principles .23
7.1.1 General requirements and assumptions .23
7.1.2 Control of ISDN user port for the PL capability .25
7.1.2.1 Statements and assumptions .25
7.1.2.2 ISDN and PL capability.25
7.1.2.3 Decoupling of AN and LE FSM.26
7.2 Provisioning strategy and requirements.26
7.2.1 General.26
7.2.2 Provisioning requirements.26
8 Protocol architecture and multiplexing structure .27
8.1 Functional description.27
8.2 Protocol requirements for PSTN and ISDN .28
8.3 Time slots .29
8.4 Time slot allocation for communication channels.29
8.5 Layer 2 sublayering and multiplexing on communication channels.30
8.6 Layer 3 multiplexing .30
8.7 Congestion control.31
8.7.1 Flow control end to end .31
8.7.2 Congestion control on the V5.1 interface .31
8.7.3 Blocking of ISDN user ports at layer 2 .31
9 Envelope Function sublayer of LAPV5 (LAPV5-EF) .31
9.1 Frame structure for peer-to-peer communication.31
9.1.1 General.31
9.1.2 Flag sequence.32
9.1.3 Interframe time fill.32
9.1.4 Envelope function address field .32
9.1.5 Envelope information field.32
9.1.6 Transparency .32
9.1.7 Frame Check Sequence (FCS).32

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ETS 300 324-1: February 1994
9.1.8 Format convention. 33
9.1.9 Invalid frames . 33
9.1.10 Frame aborts . 33
9.2 Format of fields for data link envelope peer-to-peer communication. 33
9.2.1 Envelope function address field format . 33
9.2.2 Address field variables. 33
9.2.2.1 Address field extension bit . 33
9.2.2.2 EFaddr . 33
10 Data Link sublayer of LAPV5 (LAPV5-DL) . 34
10.1 Frame structure for peer-to-peer communication . 34
10.1.1 General . 34
10.1.2 Link address field. 34
10.1.3 Control field. 34
10.1.4 Information field . 34
10.1.5 Format convention. 34
10.2 Invalid frames. 34
10.3 Elements of procedures and formats of fields for data link sublayer peer-to-peer
communication. 35
10.3.1 Link address field format . 35
10.3.2 Link address field variables . 35
10.3.2.1 Address field extension (EA) bit. 35
10.3.2.2 Command/response field bit . 35
10.3.2.3 V5DLaddr. 35
10.3.3 Control field formats . 35
10.3.4 Control field parameters and associated state variables. 36
10.3.5 Frame types. 36
10.4 Definition of the peer-to-peer procedures of the data link sublayer . 36
10.4.1 General . 36
10.4.2 Procedure for the use of the Poll/Final (P/F) bit. 37
10.4.3 Terminal Endpoint Identifier (TEI) management procedures . 37
10.4.4 Automatic negotiation of data link layer parameters. 37
10.4.5 Procedures for establishment and release of multiple frame operation . 38
10.4.5.1 Establishment of multiple frame operation. 38
10.4.5.1.1 General. 38
10.4.5.1.2 Establishment procedures. 38
10.4.5.1.3 Procedure on expiry of timer T200. 39
10.4.5.2 Information transfer. 39
10.4.5.3 Termination of multiple frame operation . 39
10.4.5.4 Link-not-established state . 39
10.4.5.5 Collision of unnumbered commands and responses. 40
10.4.5.5.1 Identical transmitted and received
commands. 40
10.4.5.5.2 Different transmitted and received
commands. 40
10.4.5.6 Unsolicited DM response and SABME command. 40
10.4.6 Procedures for information transfer in multiple frame operation . 40
10.4.7 Re-establishment of multiple frame operation. 40
10.4.7.1 Criteria for re-establishment. 40
10.4.7.2 Procedures. 41
10.4.8 Exception condition reporting and recovery. 41
10.4.9 List of system parameters . 41
10.4.10 Data link monitor function . 41
10.4.10.1 General . 41
10.4.10.2 Data link layer supervision in the multiple-frame-
established state . 41
10.4.10.3 Connection verification procedures. 42
10.4.11 PSTN and control data link FSM and requirements . 42
10.4.11.1 General . 42
10.4.11.2 Data link FSM. 43
11 AN frame relay sublayer . 44
11.1 General. 44

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ETS 300 324-1: February 1994
11.2 Invalid frames .44
11.3 Detailed description of the AN frame relay function.45
11.3.1 Frame received from LE.45
11.3.2 Frame received from ISDN user port .46
12 Sublayer-to-sublayer communication and mapping function .46
12.1 LAPV5-EF to LAPV5-DL communication.46
12.2 LAPV5-DL to LAPV5-EF communication.46
12.3 AN-FR to LAPV5-EF communication.46
12.4 LAPV5-EF to AN-FR communication.46
13 PSTN signalling protocol specification and layer 3 multiplexing .46
13.1 General .46
13.1.1 Introduction.46
13.1.2 Separation of responsibilities .47
13.1.3 National specific PSTN signal information elements.47
13.2 PSTN protocol entity definition.48
13.2.1 Definition of PSTN path states and explanation.48
13.2.1.1 Path states in the AN (AN(PSTN)) .48
13.2.1.2 Path states in the LE (LE(PSTN)).49
13.2.2 Definition of PSTN protocol primitives, messages and timers .49
13.3 PSTN protocol message definition and content.52
13.3.1 ESTABLISH.52
13.3.2 ESTABLISH ACK .53
13.3.3 SIGNAL .53
13.3.4 SIGNAL ACK.54
13.3.5 STATUS .54
13.3.6 STATUS ENQUIRY.54
13.3.7 DISCONNECT.55
13.3.8 DISCONNECT COMPLETE.55
13.3.9 PROTOCOL PARAMETER.55
13.4 General message format and information element coding.56
13.4.1 Overview.56
13.4.2 Protocol discriminator.56
13.4.3 Layer 3 address.57
13.4.4 Message type .57
13.4.5 Coding of other information elements .58
13.4.6 Single octet information elements .58
13.4.6.1 Pulse notification.58
13.4.6.2 Line-information.59
13.4.6.3 State .59
13.4.6.4 Autonomous-signalling-sequence .60
13.4.6.5 Sequence-response .60
13.4.7 Information elements with variable length format.61
13.4.7.1 Sequence-number .61
13.4.7.2 Cadenced-ringing .61
13.4.7.3 Pulsed-signal .62
13.4.7.4 Steady-signal .63
13.4.7.5 Digit-signal.64
13.4.7.6 Recognition-time.65
13.4.7.7 Enable-autonomous-acknowledge .66
13.4.7.8 Disable-autonomous-acknowledge .67
13.4.7.9 Cause .67
13.4.7.10 Resource-unavailable.68
13.5 PSTN call control procedures .69
13.5.1 General.69
13.5.2 Handling of error conditions .70
13.5.2.1 Protocol discriminator error .71
13.5.2.2 L3 address error .71
13.5.2.3 Message type error.71
13.5.2.4 Information element out of sequence .72
13.5.2.5 Repeated information elements.72
13.5.2.6 Mandatory information element missing.72

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ETS 300 324-1: February 1994
13.5.2.7 Unrecognized information element . 73
13.5.2.8 Content error of mandatory information element . 73
13.5.2.9 Content error of optional information element. 73
13.5.2.10 Unexpected message . 74
13.5.2.11 Optional information element not allowed. 74
13.5.2.12 Optional information element missing. 74
13.5.2.13 Status enquiry procedure. 74
13.5.2.14 Status procedure. 76
13.5.3 Path related procedures . 76
13.5.3.1 Path initiation by AN. 77
13.5.3.1.1 Subscriber seizure request . 77
13.5.3.1.2 Subscriber seizure confirmation. 78
13.5.3.2 Path initiation by LE. 79
13.5.3.2.1 Establish request. 79
13.5.3.2.2 Establish acknowledge. 80
13.5.3.3 Path collision. 80
13.5.3.3.1 Originating call prevail. 80
13.5.3.3.2 Destination call prevail . 81
13.5.3.4 Path active . 81
13.5.3.4.1 Normal operation. 81
13.5.3.4.2 Exceptional procedures. 82
13.5.3.5 Disconnecting path. 82
13.5.3.5.1 Disconnect request . 83
13.5.3.5.2 Disconnect acknowledge . 84
13.5.3.6 Line information procedure . 84
13.5.3.6.1 Normal operation. 84
13.5.3.6.2 Exceptional procedures. 85
13.5.4 Non-path related procedures. 85
13.5.4.1 Protocol parameter procedures . 85
13.5.4.1.1 Normal operation. 85
13.5.4.1.2 Exceptional procedures. 86
13.5.4.2 Port blocking procedures . 86
13.5.4.3 Restart procedure . 86
13.5.5 Layer 3 error detection procedure . 87
13.5.5.1 Multiple SIGNAL message operation - variables,
sequence numbers and timers . 87
13.5.5.1.1 Modulus. 87
13.5.5.1.2 Send sequence variable S(S). 87
13.5.5.1.3 Acknowledge sequence variable S(A) . 87
13.5.5.1.4 Send sequence number M(S) . 88
13.5.5.1.5 Receive sequence variable S(R). 88
13.5.5.1.6 Receive sequence number M(R) . 88
13.5.5.1.7 Timer Tt. 88
13.5.5.1.8 Timer Tr. 88
13.5.5.2 Multiple SIGNAL message operation - procedures. 88
13.5.5.2.1 Initialization. 88
13.5.5.2.2 Sending a SIGNAL message . 88
13.5.5.2.3 Sending a SIGNAL ACK message. 88
13.5.5.2.4 Receiving a SIGNAL message. 89
13.5.5.2.5 Receiving a SIGNAL ACK message . 89
13.5.5.2.6 Start of timer Tr . 89
13.5.5.2.7 Stop of timer Tr . 89
13.5.5.2.8 Timeout of timer Tr. 89
13.5.5.2.9 Start of timer Tt . 89
13.5.5.2.10 Stop of timer Tt. 89
13.5.5.2.11 Timeout of timer Tt. 89
13.5.5.2.12 Receiving a DISCONNECT message. 89
13.5.5.3 Multiple SIGNAL message operation - values . 90
13.5.5.3.1 Number of outstanding SIGNAL
messages. 90
13.5.5.3.2 Timer Tt. 90
13.5.5.3.3 Timer Tr. 90
13.6 List of system parameters. 90

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ETS 300 324-1: February 1994
13.7 AN and LE side state tables.91
14 Control requirements and protocol.97
14.1 ISDN user port status indication and control protocol.97
14.1.1 General aspects .97
14.1.2 Events and function elements relevant for the control of the state
machines.98
14.1.3 ISDN user port FSMs, AN (ISDN port) and LE (ISDN port) .99
14.1.3.1 Description of the states .100
14.1.3.2 Definition of port control states .100
14.1.3.2.1 ISDN user port FSM - AN(ISDN port).100
14.1.3.2.2 ISDN User port FSM - LE (ISDN port) 101
14.1.3.3 Principles and procedures .102
14.1.3.3.1 General .102
14.1.3.3.2 Blocking .102
14.1.3.3.3 Blocking request .102
14.1.3.3.4 Coordinated unblocking .102
14.1.3.3.5 Activation .103
14.1.3.4 ISDN port FSM at the AN .104
14.1.3.5 ISDN port FSM at the LE.106
14.1.4 Performance monitoring aspects .107
14.2 PSTN user port status indication and control protocol.107
14.2.1 General aspects .107
14.2.2 Events and function elements relevant for the control of the state
machines.108
14.2.3 PSTN user port FSM, AN (PSTN port) and LE (PSTN port).108
14.2.3.1 Description of the states .108
14.2.3.2 Definition of port control states .109
14.2.3.2.1 PSTN user port FSM - AN (PSTN
port).109
14.2.3.2.2 PSTN user port FSM - LE (PSTN port)109
14.2.3.3 Principles and procedures .110
14.2.3.3.1 General .110
14.2.3.3.2 Blocking .110
14.2.3.3.3 Blocking request .110
14.2.3.3.4 Coordinated unblocking .110
14.2.3.4 PSTN port FSM at the AN .111
14.2.3.5 PSTN port FSM at the LE.111
14.3 Interface layer 1 maintenance requirements and protocol.112
14.3.1 Events and failure reports .112
14.3.2 Detection algorithm for events and signals .113
14.3.3 V5.1 interface layer 1 FSM.113
14.3.4 Requirements and procedures for the additional functions.114
14.4 Control protocol.115
14.4.1 Control protocol message definition and content .115
14.4.1.1 PORT CONTROL message .115
14.4.1.2 PORT CONTROL ACK message.116
14.4.1.3 COMMON CONTROL message .116
14.4.1.4 COMMON CONTROL ACK message .117
14.4.2 General message format and information element coding .117
14.4.2.1 Overview.117
14.4.2.2 Protocol discriminator information element .117
14.4.2.3 Layer 3 (L3) address information element.117
14.4.2.4 Message type information element.118
14.4.2.5 Other information elements .119
14.4.2.5.1 Coding rules.119
14.4.2.5.2 Performance grading information
element .119
14.4.2.5.3 Rejection cause information element .120
14.4.2.5.4 Control function element information
element .120
14.4.2.5.5 Control function ID information
element .121

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ETS 300 324-1: February 1994
14.4.2.5.6 Variant information element . 121
14.4.2.5.7 Interface ID information element. 122
14.4.3 State definitions of the control protocol. 122
14.4.3.1 Port control protocol. 122
14.4.3.2 Common control protocol. 123
14.4.4 Control protocol procedures . 123
14.4.4.1 General . 123
14.4.4.2 Handling of error conditions . 124
14.4.4.2.1 Protocol discriminator error. 124
14.4.4.2.2 L3 address error. 124
14.4.4.2.3 Message type error . 124
14.4.4.2.4 Repeated information elements . 125
14.4.4.2.5 Mandatory information element
missing . 125
14.4.4.2.6 Unrecognized information element . 125
14.4.4.2.7 Content error of mandatory
information elements. 125
14.4.4.2.8 Content error of optional information
element . 125
14.4.4.2.9 Optional information element not
allowed . 126
14.4.4.2.10 Optional information element missing 126
14.4.4.3 Start traffic indication . 126
14.4.4.4 Stop traffic indication. 126
14.4.4.5 Port control protocol procedure. 126
14.4.4.6 Common control protocol procedure . 127
14.4.4.7 Timers for the control protocol . 128
14.4.4.8 AN and LE side state tables. 128
14.5 V5.1 re-provisioning procedures . 130
14.5.1 General aspects. 130
14.5.2 Events and states . 130
14.5.2.1 Events . 130
14.5.2.2 Definition of the AN and LE states for the re-provisioning
procedures . 130
14.5.3 Re-provisioning FSMs . 131
14.5.3.1 AN (variant&ID) and LE (variant&ID) state tables for the
verification procedure. 131
14.5.3.2 AN (re-pro) and LE (re-pro) state tables for the re-
provisioning synchronization procedure. 132
14.5.4 Procedures . 133
14.5.4.1 Request variant and ID . 133
14.5.4.2 Verify re-provisioning . 133
14.5.4.3 Re-provisioning synchronization . 133
14.5.4.4 Restart procedure . 134
Annex A (normative): Requirements for the support of the PL capability through an ISDN basic
access. 135
Annex B (normative): Assumptions and requirements for the support of semi-permanent leased
lines. 136
B.1 General. 136
B.2 Signalling associated to semi-permanent leased lines. 136
B.3 User ports . 136
B.4 Requirements for non-ISDN user ports for semi-permanent leased lines. 137
Annex C (normative): Basic requirements of the system management functions in AN and LE. 138

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Annex D (normative): Use of the protocol information elements for national PSTN protocols.145
D.1 Introduction.145
D.2 The placement of information elements.146
D.2.1 Information elements within the ESTABLISH message .146
D.2.2 Information elements within the ESTABLISH-ACK message.146
D.2.3 Information elements within the SIGNAL message .147
D.2.4 Information elements within the DISCONNECT message .147
D.2.5 Information elements within the DISCONNECT-COMPLETE message .147
D.2.6 Information elements within the PROTOCOL-PARAMETER message .148
D.3 The information elements.148
D.3.1 Line-Information information elements .148
D.3.1.1 Impedance marker reset .148
D.3.1.2 Impedance marker set .148
D.3.1.3 Low loop impedance .149
D.3.1.4 Anomalous loop impedance.149
D.3.1.5 Anomalous line condition received.149
D.3.2 Pulse-notification information element.149
D.3.3 Autonomous-signalling-sequence information element.149
D.3.4 Sequence-response information element.149
D.3.5 Cadenced-ringing information element.150
D.3.6 Pulsed-signal information element.150
D.3.6.1 The pulse type.150
D.3.6.2 The suppression indicator .150
D.3.6.2.1 Suppression indicator value 00.151
D.3.6.2.2 Suppression indicator value 01.151
D.3.6.2.3 Suppression indicator value 10.151
D.3.6.2.4 Suppression indicator value 11.151
D.3.6.3 The pulse duration type.151
D.3.6.4 The acknowledgement request indicator .151
D.3.6.5 The number of pulses .151
D.3.7 Use of Pulsed-signals .152
D.3.7.1 Pulsed normal polarity.152
D.3.7.2 Pulsed reverse polarity.152
D.3.7.3 Pulsed battery on C-wire .152
D.3.7.4 Pulsed on-hook .152
D.3.7.5 Pulsed reduced battery.152
D.3.7.6 Pulsed no battery.152
D.3.7.7 Meter pulse.152
D.3.7.8 Initial ring .152
D.3.7.9 Pulsed off-hook .152
D.3.7.10 Pulsed b-wire connected to earth.152
D.3.7.11 Register recall (timed open loop) .152
D.3.7.12 Earth loop pulse .153
D.3.7.13 50 Hz pulse.153
D.3.7.14 Pulsed b-wire connected to battery .153
D.3.7.15 Pulsed a-wire connected to earth.153
D.3.7.16 Pulsed a-wire connected to battery .153
D.3.7.17 Pulsed c-wire connected to earth.153
D.3.7.18 Pulsed c-wire disconnected.153
D.3.7.19 Pulsed normal battery .153
D.3.7.20 Pulsed a-wire disconnected .153
D.3.7.21 Pulsed b-wire disconnected .153
D.3.8 Use of Steady-signals.153
D.3.8.1 Normal-polarity .153
D.3.8.2 Reversed-polarity .153
D.3.8.3 Battery on c-wire.154
D.3.8.4 No battery on c-wire .154
D.3.8.5 Off hook (loop closed) .154
D.3.8.6 On hook (loop open).154
D.3.8.7 Battery on a-wire .154

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D.3.8.8 No battery on b-wire. 154
D.3.8.9 Reduced battery. 154
D.3.8.10 No battery . 154
D.3.8.11 Alternate reduced power/no power. 154
D.3.8.12 No battery on a-wire. 154
D.3.8.13 Normal battery . 154
D.3.8.14 Stop ringing. 155
D.3.8.15 Start pilot frequency. 155
D.3.8.16 Stop pilot frequency . 155
D.3.8.17 A-wire on earth . 155
D.3.8.18 Low impedance on b-wire. 155
D.3.8.19 B-wire connected to earth. 155
D.3.8.20 B-wire disconnected from earth. 155
D.3.8.21 Battery on b-wire. 155
D.3.8.22 Low loop impedance. 155
D.3.8.23 High loop impedance. 155
D.3.8.24 Anomalous loop impedance . 155
D.3.8.25 A-wire disconnected from earth. 155
D.3.8.26 C-wire on earth . 156
D.3.8.27 C-wire disconnected from earth. 156
D.3.9 Digit-signal information element. 156
D.3.10 Recognition-time information element.
...