SIST EN 300 290 V1.2.1:2004

• Abstract:

  Revision to improve the safety related text following a liaison for TC Safety. Specification of the terminal equipment side of the interface and test procedures for compliance.

• Status: Published
• Publication Date: 30-Sep-2004
• ICS: 33.040.50 - Lines, connections and circuits
• Technical Committee: SPN - Services and Protocols for Networks
• 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 EN 300 290 V1.2.1 (2001-07) - Access and Terminals (AT); 64 kbit/s digital unrestricted leased line with octet integrity (D64U); Terminal equipment interface

SIST EN 300 290 V1.2.1:2004 is the Slovenian adoption of EN 300 290 Version 1.2.1 for the Access and Terminals (AT) interface of a 64 kbit/s digital unrestricted leased line with octet integrity (D64U). It specifies the physical and electrical characteristics, the related test principles, and the code conversion rules for terminal equipment connected to ONP leased-line network termination points. In practice, it is the interface standard engineers, test labs, and compliance teams use to check whether terminal equipment will work on this leased-line service.

What does SIST EN 300 290 V1.2.1:2004 specify?

SIST EN 300 290 V1.2.1:2004 applies to terminal equipment interfaces for ONP 64 kbit/s digital unrestricted leased lines with octet integrity. Clause 1 limits the document to physical and electrical characteristics and the corresponding test principles, and it states that customer premises wiring between the terminal equipment and the Network Termination Point (NTP) is outside scope.

The document is organized into scope, references, definitions, abbreviations, requirements, and three annexes.

Annex	What it covers
Annex A	Normative test methods for compliance checking
Annex B	Normative code conversion rules for the 64 kbit/s codirectional interface
Annex C	Informative bibliography

The requirements in Clause 5 cover the interface itself, while Annex A gives the test setups and Annex B gives the bit-to-signal conversion used by the interface.

What are the key requirements of SIST EN 300 290 V1.2.1:2004?

SIST EN 300 290 V1.2.1:2004 defines how the terminal equipment interface must connect, signal, time, and behave under test. The document is aimed at making the TE interface compatible with the leased-line service, so the practical question is whether the equipment can be connected, clocked, and measured in the same way as the network expects.

Physical connection

Clause 5.1 requires a connection method based on solid conductors in the 0.4 mm to 0.6 mm range, either through fixed connection contacts or a wiring arrangement ending in unterminated solid conductors. Alternative connection methods may also be supplied.

This matters because there is no standardized connector for the interface in the document, so the installer or equipment supplier must provide a compliant way to make the connection.

Output port behavior

Clause 5.2.1 requires the output signal to follow the code conversion rules in Annex B. The output waveform must meet the G.703-based pulse-shape requirements, and output timing must be able to follow the receive-side timing or an external reference.

Clause 5.2.1.4 sets output jitter limits, with the limits checked using defined filter bandwidths. In practice, this is what prevents the transmit side from becoming too noisy in timing and upsetting downstream equipment.

Clause 5.2.1.6 and 5.2.1.7 apply where the terminal equipment has a ground. The output port must have high impedance towards ground and sufficient longitudinal conversion loss, which supports transformerless implementations and helps limit unwanted common-mode effects.

Input port behavior

Clause 5.2.2 requires the input port to decode Annex B coding without errors. It also requires operation over 64 kbit/s ±100 ppm, so the equipment must accept small frequency deviations in the incoming signal.

Clause 5.2.2.3 sets input jitter tolerance, and Clause 5.2.2.4 sets minimum return loss against a 120 Ω interface. Clauses 5.2.2.5 and 5.2.2.6 check that the input still works when the line has attenuation and reflections, including an interfering signal that is not synchronized to the wanted signal.

These requirements matter because they test the TE under realistic line conditions, not only under ideal lab conditions.

Ground-related limits and testability

Where the terminal equipment has a ground, Clauses 5.2.2.7 and 5.2.2.8 require high impedance towards ground and sufficient longitudinal conversion loss at the input port as well. Clause 5.3 states that safety is handled by CENELEC standards, and Clauses 5.4 and 5.5 place overvoltage and EMC outside the scope of this document.

For buyers and compliance teams, that means this standard covers the leased-line interface, but product approval may still require other safety, overvoltage, and EMC standards.

What terms does SIST EN 300 290 V1.2.1:2004 define?

• Leased lines - Telecommunications facilities provided by a public network with defined transmission characteristics between network termination points and no user-controlled switching.
• Network Termination Point (NTP) - The physical network connection and its technical access specifications that form part of the public telecommunications network.
• Terminal Equipment (TE) - Equipment intended to connect to the public telecommunications network to send, process, or receive information.
• D64U - 64 kbit/s digital unrestricted ONP leased line with octet integrity.
• ONP - Open Network Provision, the regulatory framework referenced by the standard.
• PRBS(2 -1) - A pseudo random bit sequence used in test signals.
• UI - Unit Interval, used for jitter measurements.
• EMC - Electro-Magnetic Compatibility.

Who uses SIST EN 300 290 V1.2.1:2004?

SIST EN 300 290 V1.2.1:2004 is used by terminal equipment designers, telecom hardware manufacturers, and test laboratories that need to verify leased-line interfaces. It is also relevant to quality and compliance teams that must document interface behavior, timing, jitter, return loss, and conformance test results.

Telecommunications organizations and buyers use it when specifying equipment for ONP leased lines, especially where a 64 kbit/s point-to-point interface must match the network termination point. It is also relevant in private networks and complex apparatus where the standard may apply alongside additional requirements.

What changed in SIST EN 300 290 V1.2.1:2004 from the previous edition?

The document history shows that the standard started as ETS 300 290, then received Amendment 1, and later appeared as V1.2.1. The scope note says this version was produced to introduce necessary changes, and the revision was made to improve the safety-related text following liaison with TC Safety.

Which standards are used with SIST EN 300 290 V1.2.1:2004?

• ITU-T Recommendation G.703 - Provides the physical and electrical interface basis used for pulse shape, return loss, and coding-related requirements.
• ITU-T Recommendation O.152 - Defines the PRBS(2 -1) sequence used in the test methods.
• ETSI EN 300 288 - Covers the network interface presentation for the same D64U service.
• ETSI EN 300 289 - Covers connection characteristics for the same D64U service.
• ETSI ETS 300 166 - Named in the introduction as part of the basis for the terminal interface.
• CENELEC EN 60950 - Cited as an example of a product safety standard.
• ETSI EG 201 212 - Provides safety categories for interfaces connected to telecommunications networks.

What does the SIST EN 300 290 V1.2.1:2004 document contain?

The document contains requirements tables for waveform shape, jitter, return loss, input loss tolerance, and longitudinal conversion loss. It also contains Annex A test methods with figures and setups for signal coding, waveform shape, input coding and reflections, return loss, jitter, longitudinal conversion loss, and impedance towards ground.

Annex A describes how to configure the terminal equipment, what stimulus to apply, what to monitor, and what results count as compliant. Annex B gives the code conversion steps for the 64 kbit/s codirectional interface and includes a figure showing the bit-to-three-level-signal conversion and the octet-timing violation pattern.

For engineering work, the document is mainly a design and verification reference. For testing, certification, and audits, it gives the measurable interface behavior and the test configurations needed to check it.

SLOVENSKI STANDARD
01-oktober-2004
Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosno hitrost 64 kbit/s
brez omejitev za prenašane signale in z ohranjanjem oktetov (D64U) - Vmesnik
terminalske opreme
Access and Terminals (AT); 64 kbit/s digital unrestricted leased line with octet integrity
(D64U); Terminal equipment interface
Ta slovenski standard je istoveten z: EN 300 290 Version 1.2.1
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.

European Standard (Telecommunications series)
Access and Terminals (AT);
64 kbit/s digital unrestricted leased line
with octet integrity (D64U);
Terminal equipment interface
2 ETSI EN 300 290 V1.2.1 (2001-07)
Reference
REN/AT-020005
Keywords
digital, interface, leased line, ONP, terminal
testing
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ETSI
3 ETSI EN 300 290 V1.2.1 (2001-07)
Contents
Intellectual Property Rights .4
Foreword.4
Introduction.5
1 Scope.6
2 References.6
3 Definitions.6
4 Abbreviations .7
5 Requirements.7
5.1 Physical characteristics. 7
5.1.1 Hardwired connection . 8
5.1.2 Alternative means of connection. 8
5.2 Electrical characteristics . 8
5.2.1 Output port . 8
5.2.1.1 Signal coding. 8
5.2.1.2 Waveform shape. 8
5.2.1.3 Output timing . 10
5.2.1.4 Output jitter. 10
5.2.1.5 Output return loss . 10
5.2.1.6 Impedance towards ground . 10
5.2.1.7 Longitudinal conversion loss. 11
5.2.2 Input port. 11
5.2.2.1 Signal coding. 11
5.2.2.2 Input clock tolerance. 11
5.2.2.3 Input jitter tolerance. 11
5.2.2.4 Input return loss. 12
5.2.2.5 Input loss tolerance. 13
5.2.2.6 Immunity against reflections. 13
5.2.2.7 Impedance towards ground . 13
5.2.2.8 Longitudinal conversion loss. 13
5.3 Safety. 14
5.4 Overvoltage. 14
5.5 Electro-magnetic compatibility. 14
Annex A (normative): Test methods .15
A.1 General.15
A.1.1 Additional information to support the test . 15
A.1.2 Equipment connection . 15
A.2 Test methods .16
A.2.1 Signal coding at output port. 16
A.2.2 Waveform shape at output port . 16
A.2.3 Input coding, loss tolerance and immunity against reflections.17
A.2.4 Return loss at input port. 18
A.2.5 Input and output jitter . 19
A.2.6 Longitudinal conversion loss . 20
A.2.7 Impedance towards ground. 21
Annex B (normative): Code conversion rules.22
Annex C (informative): Bibliography.23
History .24
ETSI
4 ETSI EN 300 290 V1.2.1 (2001-07)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Access and
Terminals (AT).
The present document results from a mandate from the Commission of the European Community (CEC) to provide
standards for the support of the Directive on Open Network Provision (ONP) of leased lines (92/44/EEC).
There are two other standards directly related to the present document:
- EN 300 288: "Access and Terminals (AT); 64 kbit/s digital unrestricted leased line with octet integrity (D64U);
Network interface presentation";
- EN 300 289: "Access and Terminals (AT); 64 kbit/s digital unrestricted leased line with octet integrity (D64U);
Connection characteristics".
The present document is based on information from ITU-T Recommendations and ETSI publications and the relevant
documents are quoted where appropriate.
National transposition dates
Date of adoption of this EN: 29 June 2001
Date of latest announcement of this EN (doa): 30 September 2001
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 2002
Date of withdrawal of any conflicting National Standard (dow): 31 March 2002
ETSI
5 ETSI EN 300 290 V1.2.1 (2001-07)
Introduction
The Council Directive on the application of Open Network Provision (ONP) to leased lines (92/44/EEC) concerns the
harmonization of conditions for open and efficient access to, and use of, the leased lines provided over public
telecommunications networks and the availability throughout the Community (EEC) of a minimum set of leased lines
with harmonized technical characteristics.
The consequence of the Directive is that Telecommunications Organizations within the EEC shall make available a set
of leased lines between points in these countries with specified connection characteristics and specified interfaces.
Two categories (voluntary and regulatory) of standard were used for the interfaces of terminal equipment designed for
connection to the ONP leased lines. Technical Basis for Regulations (TBRs) gave the earlier essential requirements
under the Directive 91/263/EEC, later replaced by 98/13/EC, for attachment to the leased lines, whereas other voluntary
standards (ETSs or ENs) gave the full technical specifications for these interfaces. The present document, which is
based on an earlier ETS, belongs to the second category.
The requirements of TBR 14 are a subset of the present document.
The present version of the present document has been produced to introduce some necessary changes.
ETS 300 166 and ITU-T Recommendation G.703 [1] were used as the basis for the terminal interface.
ETSI
6 ETSI EN 300 290 V1.2.1 (2001-07)
1 Scope
The present document specifies the physical and electrical characteristics (except safety, overvoltage and EMC aspects)
and corresponding test principles for a terminal equipment interface for connection to the network termination points of
ONP 64 kbit/s digital unrestricted leased lines with octet integrity.
The present document is to ensure that the interface of the terminal equipment is compatible with the ONP 64 kbit/s
digital unrestricted leased line with octet integrity. It is applicable to all interfaces designed for connection to the leased
line, however in the cases of apparatus that carries a particular service, of complex apparatus and of apparatus in private
networks, other requirements may apply in addition to the present document.
Customer premises wiring and installation between the terminal equipment and the Network Termination Point (NTP)
are outside the scope of the present document.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
[1] ITU-T Recommendation G.703 (1998): "Physical/electrical characteristics of hierarchical digital
interfaces".
[2] ITU-T Recommendation O.152 (1992): "Error performance measuring equipment for bit rates of
64 kbit/s and N x 64 kbit/s".
3 Definitions
For the purposes of the present document, the following definitions apply:
leased lines: telecommunications facilities provided by a public telecommunications network that provide defined
transmission characteristics between network termination points and that do not include switching functions that the
user can control, (e.g. on-demand switching)
Network Termination Point (NTP): all physical connections and their technical access specifications which form part
of the public telecommunications network and are necessary for access to and efficient communication through that
public network
Terminal Equipment (TE): equipment intended to be connected to the public telecommunications network, i.e.:
a) to be connected directly to the termination of a public telecommunication network; or
b) to interwork with a public telecommunications network being connected directly or indirectly to the termination
of a public telecommunications network;
in order to send, process, or receive information.
ETSI
7 ETSI EN 300 290 V1.2.1 (2001-07)
4 Abbreviations
For the purposes of the present document, the following abbreviations apply:
D64U 64 kbit/s digital unrestricted ONP leased line with octet integrity
dc direct current
EMC Electro-Magnetic Compatibility
NTP Network Termination Point
ONP Open Network Provision
ppm parts per million
PRBS(2 -1) Pseudo Random Bit Sequence (as defined in clause 2.1 of ITU-T Recommendation O.152 [2])
rms root mean square
RX Receive (a signal input at either the leased line interface or the test equipment, see figure 1)
TE Terminal Equipment
TX Transmit (a signal output at either the leased line interface or the test equipment, see figure 1)
UI Unit Interval
5 Requirements
The terminal equipment interface is for use with 64 kbit/s unrestricted leased lines with octet integrity, which provide
bidirectional, point-to-point digital connections with a usable bit rate of 64 kbit/s where the leased line output timing is
provided from the network. The interface timing arrangements are codirectional.
5.1 Physical characteristics
Currently no standardized connector is readily available. Consequently, the only method of connection that can be
specified in the present document is the use of solid conductors of 0,4 mm to 0,6 mm. The present document requires
the TE to be capable of presenting either a point for the attachment of unterminated solid conductors, or solid
conductors themselves (see clause 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 clause 5.1.2).
NOTE 1: The following are examples of arrangements that comply with the requirements. The list below should
not be regarded as an exhaustive list of all permitted arrangements:
a) a cord, permanently connected to the terminal equipment at one end and unterminated at the other end,
with wires that are solid conductors with diameters in the range 0,4 mm to 0,6 mm;
b) a cord, connected via a plug and socket to the terminal equipment at one end and unterminated at the
other end, with wires that are solid conductors with diameters in the range 0,4 mm to 0,6 mm;
c) an insulation displacement connector, designed to accept wires with solid conductors with diameters
in the range 0,4 mm to 0,6 mm, but with no cord;
d) a screw connector, designed to accept wires with solid conductors with diameters in the range 0,4 mm
to 0,6 mm, but with no cord;
e) the arrangement in b) plus one or more additional alternative cords with the same plug or socket
arrangement at the terminal end and any plug or socket at the other end;
f) the arrangement in c) or d) plus one or more cords suitable for connection to the terminal equipment at
one end and any plug or socket at the other end.
The transmit pair is the output from the terminal equipment interface. The receive pair is the input to the terminal
equipment interface, as shown in figure 1. Where the terms "output" and "input" are used without qualification in the
present document, they refer to the terminal equipment interface.
ETSI
8 ETSI EN 300 290 V1.2.1 (2001-07)
OUTPUT INPUT
TX
RX
NETWORK
TERMINAL
INTERFACE
EQUIPMENT
INPUT OUTPUT
Figure 1
NOTE 2: The use of a shielded cord or cable may be necessary to meet radiation and immunity requirements
defined in Electro-Magnetic Compatibility (EMC) standards.
5.1.1 Hardwired connection
Requirement: The terminal equipment shall provide:
a) a set of connection contacts (e.g. an insulation displacement connector or a screw terminal block) to which solid
wire conductors with diameters in the range 0,4 mm to 0,6 mm may be connected; or
b) a wiring arrangement connected by any means to the terminal equipment, with unterminated solid wire
conductors with diameters in the range 0,4 mm to 0,6 mm at the end distant from the terminal equipment.
Test: There is no test. All subsequent tests are carried out via the specified connection method.
5.1.2 Alternative means of connection
Any alternative means of connection may be provided in addition to the connection arrangements under clause 5.1.1.
5.2 Electrical characteristics
5.2.1 Output port
5.2.1.1 Signal coding
Requirement: The signal transmitted at the output port shall comply with the encoding rules given in annex B.
Test: The test shall be conducted according to annex A, clause A.2.1.
5.2.1.2 Waveform shape
Requirement: The pulse at the output port shall comply with the requirements given in table 2 and figures 2 and 3,
taken from ITU-T Recommendation G.703 [1].
Table 2: Waveform shape at output port
Pulse shape All pulses of a valid signal shall conform with
(nominally rectangular) the masks (see figures 2 and 3) irrespective of
the polarity.
Test load impedance 120 Ω non-reactive
Nominal peak voltage V of a mark (pulse)
1V
Peak voltage of a space (no pulse) 0V±0,1V
Nominal pulsewidth 3,9µsfor asinglepulse
7,8µs for a double pulse
Ratio of the amplitudes of positive and negative pulses at 0,95 to 1,05
thecentreof thepulseinterval
Ratio of the widths of positive and negative pulses at the 0,95 to 1,05
nominal half amplitude
ETSI
9 ETSI EN 300 290 V1.2.1 (2001-07)
Figure 2: Pulse mask for single pulse
Figure 3: Pulse mask for double pulse
Test: The test shall be according to annex A, clause A.2.2.
ETSI
10 ETSI EN 300 290 V1.2.1 (2001-07)
5.2.1.3 Output timing
Requirement: The terminal equipment shall be capable of:
a) synchronizing the output timing to the timing received at the receive side of the interface; or
b) synchronizing the output timing to an external reference (plesiochronous working).
NOTE: Additional sources of timing, e.g. an internal clock, are not precluded by the above requirement.
Test: The test for the synchronization of the output timing is covered by the test of annex A, clause A.2.5.
5.2.1.4 Output jitter
This requirement applies when the terminal equipment is producing the timing from an internal clock source or when
the terminal equipment is deriving the output timing from an external source (including derivation from the input
signal).
Requirement: The peak-to-peak output jitter shall not exceed the limits of table 3 when measured with first order linear
filters with the defined cut-off frequencies. For the purpose of testing, any signal input from which the output timing is
derived shall be provided with the maximum tolerable input jitter and with the maximum tolerable input frequency
deviation as specified by the manufacturer.
NOTE: This requirement differs from that in ETR 005 which defines maximum output jitter in terms of intrinsic
jitter and a jitter transfer characteristic. Intrinsic jitter is limited to 0,05 UI from 20 Hz to 20 kHz. The
jitter transfer characteristic is limited to 0,5 dB from 20 Hz to 3 kHz, decreasing to -16 dB at 20 kHz.
Where the output timing of the terminal equipment is taken from the leased line, the input to the terminal equipment
shall be provided with components of sinusoidal jitter at points on the curve of figure 4 and table 5.
Table 3: Maximum output jitter
Measurement filter bandwidth Output jitter
Lower cut-off
...