SIST EN 300 347-1 V2.2.2:2005

• Abstract:

  Second edition of the V.5.2 interface will align with the second editi on of the V5.1 interface.

• Status: Published
• Publication Date: 31-Mar-2005
• ICS: 33.040.30 - Switching and signalling systems
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2005
• Due Date: 01-Apr-2005
• Completion Date: 01-Apr-2005
• Ref Project: ETSI EN 300 347-1 V2.2.1 (1999-12) - V interfaces at the digital Local Exchange (LE); V5.2 interface for the support of Access Network (AN); Part 1: V5.2 interface specification

SIST EN 300 347-1 V2.2.2:2005 is the Slovenian standard identical to ETSI EN 300 347-1 Version 2.2.2. It specifies the V5.2 interface between an Access Network (AN) and a Local Exchange (LE) for digital local exchange access networks, including electrical, physical, procedural, and protocol requirements. In practice, it tells equipment makers and operators how to carry PSTN, ISDN-BA, and ISDN-PRA services, allocate bearer channels, and manage failures on the interface.

What does SIST EN 300 347-1 V2.2.2:2005 specify?

SIST EN 300 347-1 V2.2.2:2005 specifies the V5.2 interface for support of an Access Network (AN) at a digital Local Exchange (LE). The scope covers interface requirements and the protocol behavior needed to support access services over one or more 2 048 kbit/s links.

The document is organized into clauses for scope, references, definitions, physical and procedural interface requirements, services and architecture, control and provisioning, protocol architecture, control, link control, bearer channel connection (BCC), and protection. It also includes normative and informative annexes that give service cases, management rules, message examples, explanatory notes, and implementation guidance.

Annex	What it covers
A	Support of the Permanent Line (PL) capability through an ISDN port
B	Assumptions and requirements for semi-permanent leased lines
C	Basic requirements of system management functions in the AN and the LE
D	Use of protocol information elements for national PSTN protocols
E	Normative BCC rules, coordination examples, and link failure rules
F	Service scenarios, architecture, and access arrangement concepts
G	Upgrade concept and requirements from V5.1 to V5.2
H	PSTN protocol explanatory notes and information flow
J	AN requirements for pulse dialling
K	Layer 3 PSTN protocol error detection
L	SDL diagrams for additional protocols and management functions
M	Frame formats and message types used in the V5.2 interface
N	ISDN-BA, ISDN-PRA, and PSTN user port status control
P	Protection protocol explanatory notes and information flow
Q	Examples for implementations with high interoperability

What are the key requirements of SIST EN 300 347-1 V2.2.2:2005?

SIST EN 300 347-1 V2.2.2:2005 is mainly about how AN and LE equipment share links, control ports, allocate bearer channels, and recover from failures. The practical point is that implementation is not just a physical connection problem - it is a coordinated control and signaling system with defined states, messages, and timers.

Physical interface and link structure

Clause 4 allows the V5.2 interface to use between one and sixteen 2 048 kbit/s links, and it may use ETSI standard transmission systems designed for 2 048 kbit/s signals. The jitter requirements follow EN 300 324-1. For implementers, this means the interface can be scaled, but the transmission design still has to fit a 2 Mbit/s transport model.

Clause 5 says each link follows the same functional and procedural requirements as EN 300 324-1, and Clause 5.1 adds link-ID verification and link blocking through the link control protocol. In practice, the system must be able to identify individual links and take one link out of service without losing control of the whole interface.

Services, provisioning, and time slots

Clause 6 says V5.2 supports the services already covered by V5.1 and adds ISDN-PRA. The service set includes PSTN, ISDN-BA, Permanent Line (PL) capability, semi-permanent leased lines, and permanent leased line service. This matters because the AN and LE have to be provisioned for the exact mix of user ports and service types in use.

Clause 8 defines the protocol architecture and the use of time slots. Time slots 16, 15, and 31 of each 2 048 kbit/s link may be used as physical communication channels, and the remaining provisioned slots are available as bearer channels under BCC control. For capacity planning, this means bearer traffic and control traffic share the same link resources and have to be assigned carefully.

Control, BCC, and protection behavior

Clause 7 states that bearer channel allocation is handled by the BCC protocol, and that resource management exists in both the LE and the AN. It also states that the protection protocol must keep control, link control, and BCC communication paths available even if one 2 048 kbit/s link fails. In practice, the interface is designed to keep control signaling alive during link faults.

Clause 15 defines port control and common control using normative finite state machine (FSM) specifications. It covers ISDN-BA user port status indication and control, PSTN user port status, ISDN-PRA user port state handling, and accelerated alignment of port-related protocol entities and FSMs. For implementers, this means port state changes must follow defined sequences and timers rather than ad hoc local behavior.

Clause 16 defines link control for each individual 2 048 kbit/s link, including link status, link identification, blocking, coordinated unblocking, and recovery after layer 1 failure. The link control protocol carries messages such as link identification request and acknowledgment, and it defines how AN and LE sides react to error conditions. This is the part that keeps maintenance actions synchronized on both ends.

Clause 17 defines the BCC protocol for allocating and releasing bearer channels between user ports and V5.2 time slots. It supports allocation, de-allocation, audit, AN fault reporting, and protocol error handling, with separate messages, information elements, and timers. In practice, BCC is the mechanism that keeps bearer channel assignments consistent with call handling and resource management.

Clause 18 defines the protection protocol for interfaces with more than one 2 048 kbit/s link. It uses protection groups, logical C-channel identification, switch-over request and acknowledgment messages, sequence-number reset, and timer-based procedures. The key operational point is that protection switching happens on a logical C-channel basis, so services can move to standby resources without changing the underlying logical allocation model.

What terms does SIST EN 300 347-1 V2.2.2:2005 define?

• Access Network (AN) - The network side that connects user access arrangements to the V5.2 interface and takes part in control, protection, and resource management.
• Local Exchange (LE) - The exchange side of the V5.2 interface that works with the AN for call control, bearer allocation, and link management.
• Bearer Channel Connection (BCC) - The protocol used to allocate and de-allocate bearer channels between AN user ports and V5.2 time slots.
• Finite State Machine (FSM) - The formal state model used in the standard to define port control, link control, BCC, and protection behavior.
• Active C-channel - A physical C-channel that is currently carrying a logical C-channel.
• Logical C-channel - A group of one or more C-paths, of different types, that act together as the logical control channel.
• ISDN D-channel information - D-channel information from basic or primary rate access user ports, including Ds-, p- and f-type data.
• Permanent Line (PL) capability - The capability for permanent line service support through the V5.2 access arrangement.

Who uses SIST EN 300 347-1 V2.2.2:2005?

SIST EN 300 347-1 V2.2.2:2005 is used by telecom equipment manufacturers, network operators, and system integrators that build or run V5.2 access systems. It is also relevant to test labs and quality teams that need to verify interoperability between AN and LE equipment.

Typical uses include:

• designing AN and LE interface hardware and software
• implementing link control, port control, BCC, and protection protocols
• planning bearer-channel and time-slot provisioning
• coordinating fault handling and maintenance behavior
• checking compatibility during V5.1 to V5.2 upgrades
• validating protocol messages, state transitions, and timer behavior

What changed in SIST EN 300 347-1 V2.2.2:2005 from the previous edition?

SIST EN 300 347-1 V2.2.2:2005 is the second edition of the V5.2 interface and aligns with the second edition of the V5.1 interface. The foreword states that the revision was used to bring the two interfaces into line.

The documented changes are:

• Clause 4 generalizes the electrical and physical requirements.
• Subclause 5.1.2 enhances link blocking when the AN has an internal failure.
• Subclause 8.7.4 adds a reference to V5.1 for the need for a flow control mechanism at layer 2.
• Subclause 15.4 adds accelerated port alignment to reduce messages during startup.
• Annex C was modified most heavily to align with V5.1, especially for startup, restart, and link blocking or unblocking procedures.

Which standards are used with SIST EN 300 347-1 V2.2.2:2005?

Standard	What it contributes
EN 300 324-1	Base V5.1 interface specification used repeatedly as the reference model for V5.2
ETS 300 297	Line transmission system for ISDN basic access with NT1 separate from the AN
ETS 300 012	User network interface on the user side of the AN for ISDN basic access
ETS 300 233	ISDN-PRA layer 1 functions controlled by the AN
ETS 300 403-1	Coding rules for information elements, including the single-codeset rule
ETS 300 376 Parts 1 and 2	Q3 interface for configuration management of V5 interfaces and associated user ports
ETS 300 377 Parts 1 and 2	Q3 interface for configuration management of V5 interfaces and associated customer profiles
ETS 300 378-1	Q3 interface for fault and performance management of V5 interfaces and associated user ports

What does the SIST EN 300 347-1 V2.2.2:2005 document contain?

SIST EN 300 347-1 V2.2.2:2005 contains protocol definitions, state machines, message formats, and management rules rather than product-specific hardware design. It includes tables for message types, information-element coding, timer values, and state transitions.

It also includes figures for the protocol architecture, time-slot use, and frame formats, plus SDL diagrams in Annex L. Annex E and Annex P add arrow diagrams and information-flow examples, which are useful for understanding how BCC and protection interact with call handling and failure recovery.

The document is structured to support implementation, integration, and testing of V5.2 interfaces. For a reader, the main value is that it defines how the AN and LE coordinate services, reserve channels, react to failures, and keep control paths available across one or more 2 048 kbit/s links.

SLOVENSKI STANDARD
01-april-2005
Vmesniki V pri digitalnih krajevnih telefonskih centralah (LE) - Vmesnik V5.2 za
podporo dostopovnemu omrežju (AN) - 1. del: Specifikacija vmesnika V5.2
V interfaces at the digital Local Exchange (LE); V5.2 interface for the support of Access
Network (AN); Part 1: V5.2 interface specification
Ta slovenski standard je istoveten z: EN 300 347-1 Version 2.2.2
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.

ETSI EN 300 347-1 V2.2.2 (1999-12)
European Standard (Telecommunications series)
V interfaces at the digital Local Exchange (LE);
V5.2 interface for the support of Access Network (AN);
Part 1: V5.2 interface specification

2 ETSI EN 300 347-1 V2.2.2 (1999-12)
Reference
REN/SPS-09060-1
Keywords
V interface, V5 interface, LE, AN
ETSI
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No part may be reproduced except as authorized by written permission.
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© European Telecommunications Standards Institute 1999.
All rights reserved.
ETSI
3 ETSI EN 300 347-1 V2.2.2 (1999-12)
Contents
Intellectual Property Rights.10
Foreword.10
Introduction .11
1 Scope .13
2 References.14
3 Definitions and abbreviations .15
3.1 Definitions.15
3.2 Abbreviations .17
4 Electrical and physical interface requirements .17
5 Procedural interface requirements .18
5.1 Link control requirements and procedures .18
5.1.1 Link-ID verification.18
5.1.2 Link blocking.18
6 Services and architecture aspects and requirements .19
6.1 On-demand services .19
6.1.1 PSTN .19
6.1.2 ISDN Basic Access (ISDN-BA) .19
6.1.3 ISDN Primary Rate Access (ISDN-PRA).20
6.2 Permanent Line (PL) capability.20
6.3 Semi-permanent leased line.20
6.4 Permanent leased line service.20
7 Control and provisioning.21
7.1 Control principles.21
7.1.1 General requirements and assumptions.21
7.1.2 Control of ISDN-BA user port for the PL capability .23
7.1.3 Control of ISDN-PRA user ports when the PL capability is provided.23
7.1.3.1 Statements and assumptions .23
7.1.3.2 ISDN and PL capability .23
7.2 Provisioning strategy and requirements.24
7.2.1 General.24
7.2.2 Provisioning requirements .24
7.3 Bearer Channel Connection (BCC) .24
7.4 Protection .25
8 Protocol architecture and multiplexing structure.25
8.1 Functional description .25
8.2 Protocol requirements for PSTN and ISDN .26
8.3 Time slots .27
8.4 Time slot allocation for physical communication channels .27
8.4.1 Data types for V5.2 C-paths.28
8.4.2 Communication paths when PSTN is provided on a V5.2 interface .28
8.4.3 Communication paths when ISDN is provided on a V5.2 interface.28
8.5 Layer 2 sublayering and multiplexing on communication channels .29
8.6 Layer 3 multiplexing.29
8.7 Congestion control.29
8.7.1 Flow control end to end .29
8.7.2 Congestion control on the V5.2 interface .29
8.7.3 Blocking of ISDN user ports at layer 2.29
8.7.4 Flow control using LAPV5-DL mechanisms .29
ETSI
4 ETSI EN 300 347-1 V2.2.2 (1999-12)
9 Envelope Function sublayer of LAPV5 (LAPV5-EF) .29
10 Data Link sublayer of LAPV5 (LAPV5-DL).30
10.1 Frame structure for peer-to-peer communication .30
10.2 Invalid frames.30
10.3 Elements of procedures and formats of fields for data link sublayer peer-to-peer communication .30
10.3.1 Link address field format .30
10.3.2 Link address field variables .30
10.3.2.1 Address field extension bit (EA) .30
10.3.2.2 Command/response field bit.30
10.3.2.3 V5DLaddr .30
10.3.3 Control field formats.30
10.3.4 Control field parameters and associated state variables.30
10.3.5 Frame types.31
10.4 Definition of the peer-to-peer procedures of the data link sublayer .31
11 AN frame relay sublayer .31
12 Sublayer-to-sublayer communication and mapping function .31
13 General layer 3 protocol structures .31
13.1 General .31
13.2 Information elements that appear in every message (header) .32
13.2.1 Protocol Discriminator information element.32
13.2.2 Layer 3 Address information element.33
13.2.3 Message Type information element .33
13.3 Other information elements .34
13.4 Protocol message functional definition and information content.34
13.5 Codesets .34
14 PSTN signalling protocol specification and layer 3 multiplexing .34
15 Control requirements and protocol .34
15.1 ISDN-BA user port status indication and control.34
15.2 PSTN user port status indication and control .35
15.3 ISDN primary rate user port status indication and control .35
15.3.1 General aspects .35
15.3.2 Events and function elements relevant for the control of the state machines .36
15.3.3 ISDN-PRA user port FSMs, AN (ISDN port) and LE (ISDN port).38
15.3.3.1 Description of the states .38
15.3.3.2 Definition of port control states.38
15.3.3.2.1 ISDN-PRA user port FSM - AN (ISDN port) .38
15.3.3.2.2 ISDN-PRA user port FSM - LE (ISDN port) .39
15.3.3.3 Principles and procedures .39
15.3.3.3.1 General .39
15.3.3.3.2 Blocking .39
15.3.3.3.3 Blocking request.40
15.3.3.3.4 Co-ordinated unblocking .40
15.3.3.3.5 User failure/network failure indication .40
15.3.3.3.6 Support of the permanent line capability .40
15.3.3.4 ISDN port FSM at the AN.41
15.3.3.5 ISDN port FSM at the LE .42
15.3.4 Performance monitoring aspects.42
15.4 Control protocol .43
15.4.1 Control protocol message definition and content.43
15.4.2 General message format and information element coding .43
15.4.3 State definition of the control protocol .44
15.4.4 Control protocol procedures .44
15.4.5 Accelerated alignment of the port related protocol entities and FSMs .45
15.5 V5.2 re-provisioning procedures .45
16 Link control requirements and protocol.46
16.1 2 048 kbit/s layer 1 link maintenance requirements.47
ETSI
5 ETSI EN 300 347-1 V2.2.2 (1999-12)
16.1.1 Events and failure reports .47
16.1.2 Detection algorithm for events and signals .48
16.1.3 V5.2 interface layer 1 link FSM.48
16.1.4 Requirements and procedures for the additional functions .50
16.2 Link control requirements and procedures .50
16.2.1 The link blocking and unblocking.50
16.2.2 The link identification.51
16.2.3 Events and function elements relevant for the control of the link state machines.52
16.2.4 Link control FSM, AN (link) and LE (link).53
16.2.4.1 Description of the states .53
16.2.4.2 Definition of link control states and general co-ordination requirements.54
16.2.4.2.1 Link control FSM - AN (AN_Link).54
16.2.4.2.2 Link control FSM - LE (LE_Link) .55
16.2.4.3 Principles and procedures .55
16.2.4.3.1 General .55
16.2.4.3.2 Link blocking.56
16.2.4.3.3 Link blocking request .56
16.2.4.3.4 Co-ordinated link unblocking .56
16.2.4.3.5 Link identification .57
16.2.4.4 Link control FSM at the AN.58
16.2.4.5 Link control FSM at the LE .59
16.3 Link control protocol.60
16.3.1 Link control protocol message definition and content .60
16.3.1.1 LINK CONTROL message .60
16.3.1.2 LINK CONTROL ACK message.60
16.3.2 Link control protocol information element definition, structure and coding.61
16.3.2.1 Layer 3 address information element .61
16.3.2.2 Link control function information element.61
16.3.3 Definitions of the link control protocol states.62
16.3.4 Link control protocol procedure .62
16.3.4.1 General.62
16.3.4.2 Start traffic indication.63
16.3.4.2.1 Normal operation.63
16.3.4.2.2 Exceptional procedures.63
16.3.4.3 Stop traffic indication.63
16.3.4.3.1 Normal operation.63
16.3.4.3.2 Exceptional procedures.63
16.3.4.4 Link control layer 3 protocol entity procedure.63
16.3.5 Handling of error conditions.64
16.3.5.1 Protocol discriminator error .64
16.3.5.2 Layer 3 address error.64
16.3.5.3 Message type error .64
16.3.5.4 Repeated information elements .64
16.3.5.5 Mandatory information element missing.64
16.3.5.6 Unrecognized information element .64
16.3.5.7 Content error of mandatory information elements.65
16.3.6 Timers for the link control protocol.65
16.3.7 AN and LE side layer 3 protocol entity state tables.65
17 BCC protocol elements and procedures.66
17.1 General .66
17.2 BCC protocol entity definition .68
17.2.1 Definition of BCC protocol states.68
17.2.1.1 BCC states in the AN .68
17.2.1.2 BCC states in the LE .69
17.2.2 Definition of BCC protocol primitives, messages and timers .70
17.3 BCC protocol message definition and content.71
17.3.1 ALLOCATION message .72
17.3.2 ALLOCATION COMPLETE message .72
17.3.3 ALLOCATION REJECT message .73
17.3.4 DE-ALLOCATION message.73
ETSI
6 ETSI EN 300 347-1 V2.2.2 (1999-12)
17.3.5 DE-ALLOCATION COMPLETE message.74
17.3.6 DE-ALLOCATION REJECT message.74
17.3.7 AUDIT message .74
17.3.8 AUDIT COMPLETE message.75
17.3.9 AN FAULT message .76
17.3.10 AN FAULT ACKNOWLEDGE message.76
17.3.11 PROTOCOL ERROR message.76
17.4 BCC information element definition, structure and coding .77
17.4.1 BCC Reference Number information element .77
17.4.2 Other information elements.77
17.4.2.1 User Port Identification information element .78
17.4.2.2 ISDN Port Time Slot Identification information element.78
17.4.2.3 V5 Time Slot Identification information element.79
17.4.2.4 Multi-Slot Map information element.79
17.4.2.5 Reject Cause information element.80
17.4.2.6 Protocol Error Cause information element.82
17.4.2.7 Connection Incomplete information element.83
17.5 Description of the BCC protocol and the BCC procedures .84
17.5.1 General.84
17.5.2 Bearer channel allocation - normal procedure .84
17.5.3 Bearer channel allocation - exceptional procedures.85
17.5.3.1 Bearer channel allocation.85
17.5.3.2 Bearer channel allocation reject .85
17.5.3.3 Bearer channel allocation abort.85
17.5.3.4 Bearer channel allocation request received for existing connection.86
17.5.3.5 Bearer channel allocation, connection override requested .86
17.5.4 Bearer channel de-allocation - normal procedure .86
17.5.5 Bearer channel de-allocation - exceptional procedures.86
17.5.5.1 Bearer channel de-allocation.86
17.5.5.2 Bearer channel de-allocation reject .87
17.5.5.3 Bearer channel de-allocation process message missing.87
17.5.6 Audit procedure .87
17.5.7 AN internal failure notification procedure.87
17.5.8 Handling of error conditions.88
17.5.8.1 Protocol discriminator error .88
17.5.8.1a BCC Reference Number coding error .89
17.5.8.2 Message type error .89
17.5.8.3 Information element out of sequence .89
17.5.8.4 Repeated mandatory information elements .89
17.5.8.4a Repeated optional information element.90
17.5.8.5 Mandatory information element missing.90
17.5.8.6 Unrecognized information element .90
17.5.8.7 Content error of mandatory information element .91
17.5.8.8 Content error of optional information element.91
17.5.8.9 Unexpected message .91
17.5.8.10 Optional information element not allowed .91
17.6 List of system parameters (timers).92
17.7 LE side and AN side state transition tables .93
18 Protection protocol specification .95
18.1 General .95
18.1.1 Introduction.95
18.1.2 Provisioning of physical and logical C-channels .95
18.1.3 Separation of responsibilities.96
18.1.4 Management of C-channel resources after failure.97
18.1.5 Monitoring functions and detection of failures .98
18.1.5.1 Failure of a 2 048 kbit/s link .98
18.1.5.2 Flag monitoring.98
18.1.5.3 Data link monitoring .98
18.1.6 Functional model for the protection protocol.98
18.2 Other principles .99
ETSI
7 ETSI EN 300 347-1 V2.2.2 (1999-12)
18.3 Protection protocol entity definition.100
18.3.1 Definition of protection protocol states .100
18.3.1.1 States in the AN.100
18.3.1.2 States in the LE .100
18.3.2 Definition of protection protocol events .100
18.4 Protection protocol message definition and content .103
18.4.1 SWITCH-OVER REQ message.103
18.4.2 SWITCH-OVER COM message.103
18.4.3 OS-SWITCH-OVER COM message .104
18.4.4 SWITCH-OVER ACK message .104
18.4.5 SWITCH-OVER REJECT message .104
18.4.6 PROTOCOL ERROR message.105
18.4.7 RESET SN COM message.105
18.4.8 RESET SN ACK message .105
18.5 Protection protocol information element definition, structure and coding .106
18.5.1 Logical C-channel identification information element.106
18.5.2 Sequence-number information element.106
18.5.3 Physical C-channel identification information element.107
18.5.4 Rejection Cause information element .107
18.5.5 Protocol Error Cause information element.108
18.6 Protection protocol procedures.109
18.6.1 General.109
18.6.2 Broadcast of protection protocol messages on the two data links of the primary and secondary link.110
18.6.2.1 Transmission of protection protocol messages.110
18.6.2.2 Receipt of protection protocol messages.110
18.6.2.3 Sequence number reset procedure.110
18.6.2.3.1 Normal procedure.110
18.6.2.3.2 Exceptional procedures.111
18.6.3 Standard protection switch-over procedure initiated by LE-side .111
18.6.3.1 Normal procedure.111
18.6.3.2 Exceptional procedures .112
18.6.3.3 Procedure on expiry of timer TSO1 .112
18.6.4 Dedicated protection switch-over procedure initiated by OS LE.113
18.6.4.1 Normal procedure.113
18.6.4.2 Exceptional procedures .113
18.6.4.3 Procedure on expiry of timer TSO2 .113
18.6.5 Protection switch-over procedure requested by AN-side.114
18.6.5.1 Normal procedure.114
18.6.5.2 Exceptional procedure, AN cannot comply with switch-over command from LE .115
18.6.5.3 Exceptional procedure, LE cannot comply with switch-over request from AN .115
18.6.5.4 Procedure on expiry of timer TSO3 .115
18.6.6 Handling of error conditions.115
18.6.6.1 Protocol discriminator error .116
18.6.6.1a Logical C-Channel identification error.116
18.6.6.2 Message type error .116
18.6.6.3 Repeated mandatory information element.117
18.6.6.4 Mandatory information element missing.117
18.6.6.5 Unrecognized information element .117
18.6.6.6 Content error of mandatory information element .118
18.6.6.7 Unexpected message .118
18.7 List of system parameters .118
18.8 AN and LE side state tables.119
18.8.1 Protection protocol FSM in the AN .119
18.8.2 Protection protocol FSM in the LE.120
ETSI
8 ETSI EN 300 347-1 V2.2.2 (1999-12)
Annex A (normative): Requirements for the support of the PL capability through an
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