SIST ETS 300 248 E1:2004/A1:2004

• Abstract:

  This amendment recommends to use the ISDN basic rate connector instead of the previous connector developed for primary rate ISDN which has some tolerance problems.

• Status: Published
• Publication Date: 30-Sep-2004
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: BTC - Business telecommunications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Oct-2004
• Due Date: 01-Oct-2004
• Completion Date: 01-Oct-2004
• Mandate: T-147-2
• Ref Project: ETSI ETS 300 248/A1 ed.1 (1995-11) - Business TeleCommunications (BTC); Open Network Provision (ONP) technical requirements; 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment interface

SIST ETS 300 248 E1:2004/A1:2004 is the Slovenian adoption of ETS 300 248 Amendment 1 for the terminal equipment interface of a 2 048 kbit/s digital unstructured leased line (D2048U). It is published under the Business TeleCommunications (BTC) / Open Network Provision (ONP) framework and focuses on how terminal equipment is connected and tested at that interface.

What does SIST ETS 300 248 E1:2004/A1:2004 specify?

SIST ETS 300 248 E1:2004/A1:2004 specifies an amendment to the ETS 300 248 terminal equipment interface requirements for D2048U leased lines. In practical terms, it updates the permitted connection method at the network side of the terminal equipment and adjusts the related test wording.

The document is organized as an amendment to the 1993 edition. In the parts shown, it changes clause 2, replaces subclause 5.1, updates subclause A.1.2, and amends the note in subclause A.2.6 of Annex A.

What are the key requirements of SIST ETS 300 248 E1:2004/A1:2004?

SIST ETS 300 248 E1:2004/A1:2004 requires the terminal equipment to support a connection method based on solid conductors with diameters in the range 0.4 to 0.6 mm. This matters because the standard is written around a practical, buildable interface rather than a connector that may be difficult to obtain.

Physical connection

• The terminal equipment shall provide either:
  • connection contacts such as an insulation displacement connector or a screw terminal block for solid wire conductors, or
  • a wiring arrangement with unterminated solid wire conductors at the far end.
• Alternative connection means may also be supplied, such as connectors, but they are additional options rather than the only permitted method.

In practice, a supplier can meet the interface requirement with a hardwired arrangement and still offer other customer-friendly connection schemes.

Interface meaning

• The transmit pair is the output from the terminal equipment interface.
• The receive pair is the input to the terminal equipment interface.
• Where the terms output and input are used without qualification, they refer to that terminal equipment interface.

This matters for installation, wiring checks, and lab testing, because the standard defines which side of the pair is treated as transmit and which as receive.

Test approach

• The tests in this ETS are carried out using the connection method suitable for unterminated solid conductors.
• For the hardwired connection, the standard states that there is no separate test; later tests are performed through the specified connection method.

This tells test labs and manufacturers which interface arrangement to use when verifying conformance.

EMC practical note

• A shielded cord or cable may be needed to meet radiation and immunity requirements defined in EMC standards.

That is a design and integration warning: the electrical connection may be acceptable, but the complete assembly still has to satisfy EMC performance.

Annex A alignment

• Annex A test wording is aligned with the solid-conductor connection method.
• The note in A.2.6 points the reference point to the terminal equipment common reference point or the equipment test reference point.

That affects how measurements are referenced during testing and documentation.

What terms does SIST ETS 300 248 E1:2004/A1:2004 define?

• Business TeleCommunications (BTC) - The ETSI technical committee named in the foreword as the body that produced the amendment.
• Open Network Provision (ONP) - The regulatory and technical framework used in the title for the leased-line requirements.
• 2 048 kbit/s digital unstructured leased line (D2048U) - The leased-line service the interface is written for.
• Terminal equipment (TE) - The customer-side equipment that connects to the leased-line interface.
• Transmit pair - The pair carrying output from the terminal equipment interface.
• Receive pair - The pair carrying input to the terminal equipment interface.
• ISDN basic rate connector - The connector type preferred by the amendment over the earlier connector approach.

Who uses SIST ETS 300 248 E1:2004/A1:2004?

SIST ETS 300 248 E1:2004/A1:2004 is used by telecom equipment manufacturers, interface designers, test laboratories, and conformity assessment teams working on D2048U terminal equipment. It is also relevant to network operators, integrators, and quality managers who need to specify how equipment is connected and how interface tests are run. Buyers use it when they need equipment that matches the physical connection method expected at this leased-line interface.

What changed in SIST ETS 300 248 E1:2004/A1:2004 from the previous edition?

SIST ETS 300 248 E1:2004/A1:2004 is Amendment 1 to ETS 300 248 (1993). The amendment changes the connector approach because the originally specified connector type conforming to ISO/IEC 10173 (1991) cannot be manufactured. It therefore requires terminal equipment to provide a connection point for solid conductors or the solid conductors themselves, while allowing other connection schemes such as connectors in addition.

It also updates the test wording so that tests are carried out using the connection method suitable for unterminated solid conductors, and it revises the note in Annex A.

Which standards are used with SIST ETS 300 248 E1:2004/A1:2004?

• ETS 300 248 (1993) - The base European Telecommunication Standard that this amendment modifies.
• ISO/IEC 10173 (1991) - The connector reference named in the foreword as the basis of the earlier specified connector type.

What does the SIST ETS 300 248 E1:2004/A1:2004 document contain?

The document contains the amendment instructions, the revised physical characteristics for the terminal equipment interface, and the updated test wording for Annex A. It includes Figure 1, which identifies the transmit and receive pairs at the terminal equipment interface. It also gives a practical note that shielded cable may be needed for EMC performance. The foreword records why the amendment was issued and identifies the connection method used for the updated tests.

ETS 300 248
AMENDMENT A1
November 1995
Source: ETSI TC-BTC Reference: RE/BTC-02062
ICS: 33.120
Key words: ONP, leased lines, D2048U
This amendment A1 modifies
the European Telecommunication Standard ETS 300 248 (1993)
Business TeleCommunications (BTC);
Open Network Provision (ONP) technical requirements;
2 048 kbit/s digital unstructured leased line (D2048U);
Terminal equipment interface
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: [e-mail]
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 1995. All rights reserved.

Page 2
ETS 300 248 October 1993/A1: November 1995
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
ETS 300 248 October 1993/A1: November 1995
Foreword
This amendment to ETS 300 248 (1993) has been produced by the Business TeleCommunications (BTC)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This amendment changes ETS 300 248 (1993) as described below:
The connector type specified, conforming to ISO/IEC 10173 (1991), cannot be manufactured. Since a
standardized connector is not available, the terminal equipment is required to provide either a point for
connection of solid conductors, or solid conductors themselves. In order to allow connection to be made
using other methods, the TE is permitted to be supplied with other connection schemes (e.g. connectors).
Transposition dates
Date of adoption of this amendment: 31 October 1995
Date of latest announcement of this amendment (doa): 31 January 1996
Date of latest publication or endorsement of this amendment (dop/e): 31 July 1996
Date of withdrawal of any conflicting National Standard (dow): 31 July 1996

Page 4
ETS 300 248 October 1993/A1: November 1995
Amendments
Page 7, amendment to clause 2
Delete reference [6].
Page 9, amendment to subclause 5.1
Replace subclause 5.1 with subclauses 5.1, 5.1.1 and 5.1.2 as given below:
"5.1 Physical characteristics
Currently no standardized connector is readily available. Consequently, the only method of connection that
can be specified in this ETS is the use of solid conductors of 0,4 to 0,6 mm. This ETS requires the TE to
be capable of presenting either a point for the attachment of unterminated solid conductors, or solid
conductors themselves (see subclause 5.1.1). It is a requirement that such a connection method be
available to be provided for use with the TE if necessary.
In order to allow connection to be made using other methods (e.g. connectors), the TE is permitted to be
supplied with a connection method suitable for use with those methods (see subclause 5.1.2).
NOTE 1: The following are examples of arrangements that comply with the requirements. The
list below should
...

SLOVENSKI STANDARD
01-oktober-2004
3RVORYQHWHOHNRPXQLNDFLMH%7&7HKQLþQH]DKWHYH]D]DJRWDYOMDQMHRGSUWRVWL
RPUHåLM'LJLWDOQL]DNXSOMHQLYRGL]DSUHQRVQRKLWURVWNELWVLQ]D
QHVWUXNWXULUDQHVLJQDOH'89PHVQLNWHUPLQDOVNHRSUHPH
Business TeleCommunications (BTC); Open Network Provision (ONP) technical
requirements; 2 048 kbit/s digital unstructured leased line (D2048U); Terminal equipment
interface
Ta slovenski standard je istoveten z: ETS 300 248/A1 Edition 1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETS 300 248
AMENDMENT A1
November 1995
Source: ETSI TC-BTC Reference: RE/BTC-02062
ICS: 33.120
Key words: ONP, leased lines, D2048U
This amendment A1 modifies
the European Telecommunication Standard ETS 300 248 (1993)
Business TeleCommunications (BTC);
Open Network Provision (ONP) technical requirements;
2 048 kbit/s digital unstructured leased line (D2048U);
Terminal equipment interface
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: [e-mail]
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 1995. All rights reserved.

Page 2
ETS 300 248 October 1993/A1: November 1995
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
ETS 300 248 October 1993/A1: November 1995
Foreword
This amendment to ETS 300 248 (1993) has been produced by the Business TeleCommunications (BTC)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This amendment changes ETS 300 248 (1993) as described below:
The connector type specified, conforming to ISO/IEC 10173 (1991), cannot be manufactured. Since a
standardized connector is not available, the terminal equipment is required to provide either a point for
connection of solid conductors, or solid conductors themselves. In order to allow connection to be made
using other methods, the TE is permitted to be supplied with other connection schemes (e.g. connectors).
Transposition dates
Date of adoption of this amendment: 31 October 1995
Date of latest announcement of this amendment (doa): 31 January 1996
Date of latest publication or endorsement of this amendment (dop/e): 31 July 1996
Date of withdrawal of any conflicting National Standard (dow): 31 July 1996

Page 4
ETS 300 248 October 1993/A1: November 1995
Amendments
Page 7, amendment to clause 2
Delete reference [6].
Page 9, amendment to subclause 5.1
Replace subclause 5.1 with subclauses 5.1, 5.1.1 and 5.1.2 as given below:
"5.1 Physical characteristics
Currently no standardized connector is readily available. Consequently, the only method of connection that
can be specified in this ETS is the use of solid conductors of 0,4 to 0,6 mm. This ETS requires the TE to
be capable of presenting either a point for the attachment of unterminated solid conductors, or solid
conductors themselves (see subc
...