SIST ETS 300 217-2 E1:2003

• Abstract:

  DE/NA-053201-2

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.40 - Data communication networks
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 217-2 ed.1 (1992-12) - Network Aspects (NA); Connectionless Broadband Data Service (CBDS); Part 2: Basic bearer service definition

SIST ETS 300 217-2 E1:2003 is the Slovenian standard identical to ETS 300 217-2 Edition 1 from ETSI. It defines the stage 1 basic bearer service for the Connectionless Broadband Data Service (CBDS). In practice, it tells service providers and users how Protocol Data Units (PDUs) are carried connectionlessly across Metropolitan Area Networks (MANs) and/or Asynchronous Transfer Mode (ATM)-based networks.

What does SIST ETS 300 217-2 E1:2003 specify?

SIST ETS 300 217-2 E1:2003 specifies the stage 1 description of the CBDS basic bearer service. It focuses on transparent transfer of limited-length PDUs between one source interface and one or more destination interfaces at the T reference point, without setting up or releasing an end-to-end connection.

The scope covers public and private environments and pays particular attention to public operators. Charging principles are outside the scope.

The document is organized into 9 clauses and 2 annexes.

Annex	What it covers
Annex A	Normative access class mechanisms for UMI, UNI and USI-related cases
Annex B	Informative bibliography

The main body covers scope, normative references, definitions and abbreviations, service description, procedures, charging capability, interworking, supplementary services, and the static service description using attributes.

What are the key requirements of SIST ETS 300 217-2 E1:2003?

Service model and provision

SIST ETS 300 217-2 E1:2003 defines a switched bearer service that transfers PDUs without establishing a connection. This matters because each PDU must carry the information the network needs for routing, and the service behaves as a connectionless data service rather than a call-based one.

Clause 5 says the service is provided by pre-arrangement with the service provider, and specific options are selected on subscription. In practice, this means the offered features depend on what the provider chooses to make available and what the customer orders.

Access options and interface planning

The standard gives different access rates for the UMI, UNI and USI interfaces, and ties these to the Maximum Information Rate (MIR). This matters for network planning because the chosen interface and protocol determine the data rate the user can actually obtain.

Clause 5.1.1.2 defines access classes in terms of Sustained Information Rate (SIR). The sending access class is chosen on subscription, while the receiving access class in the basic bearer service is not user-selectable and is equal to the MIR allowed by the chosen access rate and protocol.

Clause 9.2.2 adds that a policing function called the access class mechanism is defined for traffic sent from the user side to the public network. The practical effect is that traffic above the subscribed class can be discarded, so the subscribed rate has to match the intended use.

PDU interleaving and protocol support

Clause 5.1.1.3 and clause 9.2.3 define PDU interleaving choices across the UMI/UNI. The standard allows the subscriber to choose how many PDUs may be in transit concurrently, which matters when a site needs buffering behavior that matches bursty traffic.

The current USI protocols do not allow PDU interleaving. That is important when a buyer is comparing access options, because a USI implementation may fit simple traffic but not workloads that depend on interleaved PDUs.

Clause 5.1.1.4 maps access facilities to protocols such as IEEE 802.6, ISO/IEC 8802-3, ISO/IEC 8802-5, ISO 9314 and ATM access with AAL type 4. This tells implementers which physical and link-layer environments are intended for the service.

Service behavior, attributes and operational use

Clause 5.2 states that data is sent without establishing, maintaining or releasing an end-to-end connection, and that source-address validation failure causes the PDU to be discarded. In practice, the network must be able to route based on the PDU contents and reject invalid traffic early.

Clause 7 limits interworking to other connectionless services, and clause 8 points supplementary services to Part 3 of the ETS. For procurement or design, this means the bearer service is meant to fit connectionless environments, not arbitrary interworking scenarios.

Clause 9 describes the service with standardized attributes: PDU-based transfer, connectionless mode, variable bit rate, unrestricted transfer capability, PDU integrity, unidirectional symmetry, and point-to-point or point-to-multipoint configuration. These attributes are the checklist for deciding whether the service suits a given application.

Clause 9.3.3 defines payload length classes and links them to the interface or protocol. That matters because the maximum payload size affects frame handling, buffering and interoperability.

Annex A gives the UMI access class mechanism as a credit-manager process that compares an incoming PDU against a counter and discards it if the subscribed limit is exceeded. For operators, this is the practical policing rule that keeps traffic within the subscribed SIR.

What terms does SIST ETS 300 217-2 E1:2003 define?

• CBDS - Connectionless Broadband Data Service, the bearer service family defined by this part of the ETS.
• PDU - Protocol Data Unit, the data unit transferred by the service and used to carry payload plus routing information.
• SIR - Sustained Information Rate, the rate used to define access classes.
• MIR - Maximum Information Rate, the highest user rate allowed by the access rate and protocol.
• UMI - User MAN Interface, an access interface for MAN-based service.
• UNI - User Network Interface, the interface between a user and the network.
• USI - User Specific Interface, another access interface with its own protocol mappings.
• QOS - Quality of Service, the service-performance view used to describe measurable service behavior.

Who uses SIST ETS 300 217-2 E1:2003?

Telecommunication service providers use SIST ETS 300 217-2 E1:2003 when defining CBDS offers, access options and subscription limits. Public operators use it to understand the service model and the access-class policing rules.

Network engineers and planners use it when designing MAN or ATM-based access for LAN interconnection over metropolitan or wide areas. Quality managers use it to check which QOS parameters, payload lengths and interworking conditions apply.

Buyers and system integrators use it to compare UMI, UNI and USI access choices, including protocol support, access rates and PDU interleaving behavior. It is also relevant to organizations that need connectionless data transfer across distributed sites.

What changed in SIST ETS 300 217-2 E1:2003 from the previous edition?

SIST ETS 300 217-2 E1:2003 is identical to ETS 300 217-2 Edition 1. The history block identifies the first edition as December 1992.

Which standards are used with SIST ETS 300 217-2 E1:2003?

• CCITT Recommendation E.164 - provides the numbering plan used for user identification on the UMI and UNI, and for public USI identification when publicly administered.
• ISO/IEC 8802-3 - defines CSMA/CD LAN access and physical layer specifications used as a USI protocol option.
• ISO/IEC 8802-5 - defines token ring access and physical layer specifications used as a USI protocol option and in access-rate mappings.
• IEEE 802.6 - defines the DQDB subnetwork of a MAN and is used for UMI-related access facilities.
• CCITT Recommendation I.140 - provides the attribute technique used to describe the service in clause 9.
• ETS 300 217-1 - Part 1 of CBDS, which supplies the definitions used in this part and gives the overview of the service family.
• ISO 9314 - defines FDDI, used as a USI protocol option.
• ETS 300 217 Part 3 - contains the supplementary services associated with this bearer service category.

What does the SIST ETS 300 217-2 E1:2003 document contain?

The document contains clauses that define the service, the subscription and provisioning procedures, the access-rate and access-class model, and the static attribute description of the service. It also includes tables for access rates, MIR values, access classes, PDU interleaving choices, protocol/interface mappings, QOS parameters and payload length classes.

Annex A provides the normative access class mechanism, including the UMI credit-manager method and a standardised access-class table for DQDB-related cases. Annex B lists informative references for further background.

This structure is useful for design, provisioning, verification and service comparison. It lets readers check which interface/protocol combination fits a given network, what traffic limits apply, and what service characteristics are part of the CBDS basic bearer service.

SLOVENSKI STANDARD
01-december-2003
Omrežni vidiki (NA) – Nepovezavna širokopasovna podatkovna storitev (CBDS) –
2. del: Definicija osnovne nosilne storitve
Network Aspects (NA); Connectionless Broadband Data Service (CBDS); Part 2: Basic
bearer service definition
Ta slovenski standard je istoveten z: ETS 300 217-2 Edition 1
ICS:
33.040.40 Podatkovna komunikacijska Data communication
omrežja networks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 217-2
TELECOMMUNICATION December 1992
STANDARD
Source: ETSI TC-NA Reference: DE/NA-053201-2
ICS: 33.040
Network, CBDS
Key words:
Network Aspects (NA);
Connectionless Broadband Data Service (CBDS)
Part 2: Basic bearer service definition
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 1992. All rights reserved.
New presentation - see History box

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ETS 300 217-2: December 1992
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 300 217-2: December 1992
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .7
3.1 Definitions .7
3.2 Abbreviations .8
4 Description .8
5 Procedures.9
5.1 Provision and withdrawal .9
5.1.1 Subscriber options.9
5.1.1.1 Access rate.9
5.1.1.2 Access classes.10
5.1.1.3 PDU interleaving.10
5.1.1.4 Protocols.11
5.2 Normal procedures .11
5.3 Exceptional procedures .11
6 Network capabilities for charging .11
7 Interworking requirements.11
8 Interaction with supplementary services .11
9 Static description of the service using attributes .11
9.1 Information transfer attributes.11
9.1.1 Information transfer mode.11
9.1.2 Connection mode .12
9.1.3 Information transfer rate.12
9.1.4 Information transfer capability .12
9.1.5 Structure.12
9.1.6 Establishment of communication .12
9.1.7 Symmetry .12
9.1.8 Communication configuration.13
9.2 Access attributes .13
9.2.1 Access rate and MIR.13
9.2.1.1 Values for the UMI and UNI interfaces.13
9.2.1.2 Values for the USI interface.14
9.2.2 Access classes.14
9.2.2.1 Access classes for the UMI and UNI interfaces .14
9.2.2.2 Access classes for the USI interface.14
9.2.3 PDU interleaving.15
9.2.3.1 PDU interleaving across the UMI/UNI .15
9.2.3.2 PDU interleaving across the USI .15
9.3 General attributes .15
9.3.1 Supplementary services provided .15
9.3.2 Quality of service.15
9.3.3 Payload length.17
9.3.4 Interworking possibilities .17
9.3.5 Operational and commercial .17
Annex A (normative): Access class mechanisms .18

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ETS 300 217-2: December 1992
A.1 Access class mechanism for UMI . 18
A.2 Access class mechanism for UNI. 19
A.3 Access class mechanism for USI. 19
Annex B (informative): Bibliography . 20
History. 21

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ETS 300 217-2: December 1992
Foreword
This part of European Telecommunication Standard (ETS) 300 217 has been prepared by the Network
Aspects (NA) Technical Committee of the European Telecommunications Standards Institute (ETSI).
According to CCITT Recommendation I.130, the following three level structure is used to describe the
characterisation of telecommunication services:
- Stage 1: is an overall service description, from the user's standpoint;
- Stage 2: identifies the functional capabilities and information flows needed to support the service
described in stage 1;
- Stage 3: defines the signalling system protocols and switching functions needed to implement the
service described in stage 1.
This ETS details the stage 1 aspects for the Connectionless Broadband Data Service (CBDS).
This part constitutes Part 2 of the 4 part ETS on the CBDS, and defines the basic bearer service.
A list of informative references is given in Annex B.

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ETS 300 217-2: December 1992
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ETS 300 217-2: December 1992
1 Scope
This part of European Telecommunication Standard (ETS) 300 217 on the Connectionless Broadband
Data Service (CBDS), describes the stage 1 of the switched bearer service provided via Metropolitan Area
Networks (MANs) and/or an Asynchronous Transfer Mode (ATM) based network. It is applicable to both
the public and private environment whereas special attention is paid to the requirements of the public
operators.
This bearer service category provides a means by which Protocol Data Units (PDUs) of variable, but
limited length, are delimited and transparently transferred across one source interface to one or more
destination interface(s) at the T reference point, without establishing or later releasing a connection
between source and destination.
Charging principles are outside the scope of this ETS.
Whilst this bearer service category is aiming primarily at Local Area Network (LAN) interconnections, other
uses are envisaged.
2 Normative references
This ETS incorporates, by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to, or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[2] ISO/IEC 8802-3 (1990): "Information processing systems - Local area networks
- Part 3: Carrier sense multiple access with collision detection (CSMA/CD) -
access method and physical layer specifications".
[3] ISO/IEC 8802-5 (1991): "Information processing systems - Local area networks
- Part 5: Token ring access method and physical layer specifications".
[4] IEEE 802.6 (1990): "Distributed Queue Dual Bus (DQDB) subnetwork of a
metropolitan area network (MAN)".
[5] CCITT Recommendation I.140 (1988): "Attribute technique for the
characterization of telecommunication services supported by an ISDN and
network capabilities of an ISDN".
[6] ETS 300 217-1 (1992): "Network Aspects (NA); Connectionless Broadband Data
Service (CBDS) Part 1: Overview".
[7] ISO 9314: "Fiber Distributed Data Interface (FDDI)".
3 Definitions and abbreviations
3.1 Definitions
The definitions used in this ETS are given in Part 1, subclause 3.1 of this ETS, ETS 300 217-1 [6].

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ETS 300 217-2: December 1992
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AAL ATM Adaptation Layer
ATM Asynchronous Transfer Mode
CBDS Connectionless Broadband Data Service
CCITT International Telegraph and Telephone Consultative Committee
DQDB Distributed Queue Dual Bus
HDLC High level Data Link Control
LAN Local Area Network
LAPB Link Access Procedure Balanced
LAPD Link Access Procedure on the D-channel
LLC Logical Link Control
MAC Media Access Control
MAN Metropolitan Area Network
MIR Maximum Information Rate
PDU Protocol Data Unit
PLCP Physical Layer Convergence Procedure
QOS Quality of Service
SIR Sustained Information Rate
T T reference point
UMI User MAN Interface
UNI User Network Interface
USI User Specific Interface
4 Description
This bearer service category can be provided by any network but can more suitably be provided by MANs
and ATM-based networks. It primarily aims at interconnecting LANs and/or terminals over metropolitan or
wide areas.
The service can be provided by making use of different interfaces (User Specific Interface (USI), User
MAN Interface (UMI) or User Network Interface (UNI)).
Associated with this bearer service category are Quality of Service (QOS) parameters. Parameter values
for which options are explicitly mentioned may be negotiated between parties in the subscriber and service
provider domains respectively.
The service may be provided by direct access via high-speed end systems or by means of bridges or
routers using the connectionless service mode.

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ETS 300 217-2: December 1992
For the UMI and UNI interfaces each user can be addressed by at least one CCITT Recommendation
E.164 [1] number. When publicly administered, one USI is identified by only one CCITT Recommendation
E.164 [1] number.
5 Procedures
5.1 Provision and withdrawal
The provision of the service shall be by pre-arrangement with the service provider.
The service provider may not provide either all service options and supplementary services listed in this
ETS or the full range of features in a particular option e.g. available access classes. This ETS is a
compendium list and specific options shall be defined on subscription.
The bearer service is offered with several subscription options which apply separately to each interface at
the T reference point.
5.1.1 Subscriber options
The subscriber can choose different subscriber options. For each subscriber option one value can be
selected.
The provision of any specific subscriber options and related values within those defined in this subclause
depends on the choice of the service provider.
5.1.1.1 Access rate
The service can be provided making use of different interfaces, i.e. the USI, UMI or the UNI. Different
access rates are foreseen for the UMI:
- 2,048 Mbit/s;
- 34,368 Mbit/s;
- 139,264 Mbit/s;
- 155,520 Mbit/s.
The following access rates are foreseen for the UNI:
- 155,520 Mbit/s;
- 622,080 Mbit/s.
Further access rates may be considered according to ETSI or CCITT standardisation.
The following access rates are foreseen for the USI:
- 4 Mbit/s;
- 10 Mbit/s;
- 16 Mbit/s;
- 100 Mbit/s.
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ETS 300 217-2: December 1992
5.1.1.2 Access classes
The access class defines the information transfer capacity the subscriber subscribes to, in terms of
maximum allowed Sustained Information Rate (SIR) across the interface at the T reference point.
Upon subscription the subscriber can choose between different sending access classes. This depends on
the access rate and the protocols (see table 1).
Table 1: Values of maximum allowed SIR for different access classes
Access class SIR (Mbit/s)
A 1,473
B4*
C 10*
D 16*
E 25,201
F 103,605
G 123,629
H 155*
I 100*
* : Nominal value. The exact values are for further study.
In the basic bearer service the receiving access class cannot be chosen. It is equal to the Maximum
Information Rate (MIR) allowed by the access rate and protocol chosen (see tables 5 and 6 in subclauses
9.2.1.1 and 9.2.1.2).
If there are other services provided on the same access link, this shall reduce the MIR for sending and
receiving access classes available at the UMI and UNI for the connectionless service on the access.
5.1.1.3 PDU interleaving
Upon subscription, the subscriber can choose between different values for the number of PDUs which
may be in transit concurrently across the interface at the T reference point. This applies to the send and
receive direction of the network (see table
...