SIST ETS 300 687 E1:2003

Business TeleCommunications (BTC); 34 Mbit/s digital leased lines (D34U and D34S); Connection characteristics

Specification of the performance requirements for the connection through the public network and test methods for compliance.

Poslovne telekomunikacije (BTC) – Digitalni zakupljeni vodi za prenosno hitrost 34 Mbit/s (D34U, D34S) – Priključitvene značilnosti

General Information

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.040.50 - Lines, connections and circuits
• 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
• Mandate: T-297
• Ref Project: ETSI ETS 300 687 ed.1 (1996-04) - Business TeleCommunications (BTC); 34 Mbit/s digital leased lines (D34U and D34S); Connection characteristics

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 687 E1:2003
01-december-2003
3RVORYQHWHOHNRPXQLNDFLMH%7&±'LJLWDOQL]DNXSOMHQLYRGL]DSUHQRVQRKLWURVW
0ELWV'8'6±3ULNOMXþLWYHQH]QDþLOQRVWL
Business TeleCommunications (BTC); 34 Mbit/s digital leased lines (D34U and D34S);
Connection characteristics
Ta slovenski standard je istoveten z: ETS 300 687 Edition 1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
SIST ETS 300 687 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ETS 300 687 E1:2003

---------------------- Page: 2 ----------------------

SIST ETS 300 687 E1:2003
EUROPEAN ETS 300 687
TELECOMMUNICATION March 1996
STANDARD
Source: ETSI TC-BTC Reference: DE/BTC-02054
ICS: 33.020
Key words: leased line, network, connection, D34U, D34S
Business TeleCommunications (BTC);
34 Mbit/s digital leased lines (D34U and D34S);
Connection characteristics
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 1996. All rights reserved.

---------------------- Page: 3 ----------------------

SIST ETS 300 687 E1:2003
Page 2
ETS 300 687: March 1996
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: 4 ----------------------

SIST ETS 300 687 E1:2003
Page 3
ETS 300 687: March 1996
Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Requirements.9
4.1 Attributes.10
4.1.1 Transfer rate.10
4.1.1.1 Leased line timing.10
4.1.1.2 Information transfer rate .11
4.1.2 Information transfer susceptance.11
4.1.3 Structure.11
4.1.3.1 Frame integrity.11
4.1.3.2 Loss of input signal.11
4.1.4 Symmetry .11
4.1.5 Network performance.11
4.1.5.1 Transmission delay.11
4.1.5.2 Jitter.12
4.1.5.2.1 Jitter tolerance at the network input
port.12
4.1.5.2.2 Maximum jitter at the network output
port.13
4.1.5.3 Error performance .13
4.1.5.3.1 Bringing Into Service (BIS) limits .13
4.1.5.3.2 Performance level.14
4.1.5.4 Availability.14
Annex A (normative): Test methods.15
A.1 General.15
A.1.1 Equipment connection .15
A.2 Test methods .15
A.2.1 Leased line timing, information transfer rate, susceptance and symmetry.15
A.2.2 Delay.16
A.2.3 Jitter .17
A.2.4 Error performance.19
A.2.5 Structure - frame integrity .20
A.2.6 Structure - lack of input signal .20
Annex B (normative): Definition of frame structure .22
B.1 Frame structure at 34 368 kbit/s .22
Annex C (informative): Derivation of error performance limits .23
C.1 Introduction.23
C.2 Reference connections .23

---------------------- Page: 5 ----------------------

SIST ETS 300 687 E1:2003
Page 4
ETS 300 687: March 1996
C.2.1 Terrestrial connection. 23
C.2.2 Satellite connection . 24
C.3 Error performance objectives . 24
C.4 Long term error performance . 25
Annex D (informative): Availability . 26
D.1 General. 26
D.1.1 Unavailability . 26
D.1.2 Outage intensity . 26
D.1.3 Mean time between failures . 26
D.1.4 Mean time to restore service. 26
D.2 Recommendations. 26
Annex E (informative): Bringing Into Service (BIS) limits . 27
E.1 General. 27
E.2 BIS limits. 27
Annex F (informative): Bibliography . 28
History. 29

---------------------- Page: 6 ----------------------

SIST ETS 300 687 E1:2003
Page 5
ETS 300 687: March 1996
Foreword
This European Telecommunication Standard (ETS) has been produced by the Business
TeleCommunications (BTC) Technical Committee of the European Telecommunications Standards
Institute (ETSI).
This ETS resulted from a mandate from the Commission of the European Community (CEC) to provide
harmonised standards for support of the Directive on Open Network Provision (ONP) of leased lines
(92/44/EEC).
There is one other standard that is directly related to this ETS:
ETS 300 686: "Business TeleCommunications (BTC); 34 Mbit/s and 140 Mbit/s digital leased lines
(D34U, D34S, D140U and D140S); Network interface presentation".
Transposition dates
Date of adoption of this ETS: 15 March 1996
Date of latest announcement of this ETS (doa): 30 June 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1996
Date of withdrawal of any conflicting National Standard (dow): 31 December 1996
This ETS is based on information from ITU-T Recommendations and ETSI publications; the relevant
documents are quoted where appropriate.
Introduction
The Council Directive on the application of Open Network Provision (ONP) to leased lines (92/44/EEC)
concerns the harmonisation of conditions for open and efficient access to, and use of, the leased lines
provided over public telecommunications networks, and the availability throughout the European Union of
a minimum set of leased lines with harmonised technical characteristics.
The 34 Mbit/s structured and unstructured leased lines are not part of the minimum set of leased lines
under the Directive, however, this ETS is being written with the intention that where 34 Mbit/s leased lines
are offered, they will be in accordance with these harmonised standards.
Under the Second Phase Directive (91/263/EEC), terminal equipment for connection to these leased lines
will be required to fulfil certain essential requirements.

---------------------- Page: 7 ----------------------

SIST ETS 300 687 E1:2003
Page 6
ETS 300 687: March 1996
Blank page

---------------------- Page: 8 ----------------------

SIST ETS 300 687 E1:2003
Page 7
ETS 300 687: March 1996
1 Scope
This ETS specifies the technical requirements and conformance tests for connection characteristics of
point-to-point 34 Mbit/s digital leased lines. These leased lines operate at:
- 34 368 kbit/s providing an information transmission capability, without restriction on binary content,
(D34U); and
- 34 368 kbit/s providing an information transmission capability, without restriction on binary content,
of 33 920 kbit/s, (D34S); the remaining 448 kbit/s provides an 8 kHz framing structure in
accordance with ITU-T Recommendation G.832 of ETS 300 337.
A connection is presented via interfaces at Network Termination Points (NTPs) and includes any
equipment that may provide the NTP. Signals between NTPs are subject to impairments during their
transfer over the connection. The limits to these impairments are stated in this ETS. This ETS, together
with the companion standard ETS 300 686, defining the network interface presentation, describes the
technical characteristics of the leased line.
The tests specified in this ETS cannot be carried out by the leased line provider while the leased line is in
service, i.e. carrying users' traffic. Thus the tests are designed for bringing into and returning into service,
although there is no obligation to perform these tests each time a leased line is brought into or returned
into service. However, if the connection is structured, the error performance may be monitored by the
leased line provider while the line is in service.
This ETS is applicable for leased lines, including part time leased lines, for which the establishment or
release does not require any protocol exchange or other intervention at the NTP.
This ETS specifies the conformance tests for the connection requirements. This ETS does not include
details concerning the implementation of the tests, nor does it include information on any relevant
regulations.
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 into it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] ETS 300 686: "Business TeleCommunications (BTC); 34 Mbit/s and 140 Mbit/s
digital leased lines (D34S, D34U, D140S and D140U); Network interface
presentation".
[2] ITU-T Recommendation O.151 (1992): "Error performance measuring
equipment for digital systems at the primary bit rate and above".
[3] ITU-T Recommendation O.171 (1992): "Timing jitter measuring equipment for
digital systems".
NOTE: This ETS also contains a number of informative references which have been included
to indicate the sources from which various material has been derived, hence they do
not have an associated normative reference number. Details of these publications are
given in annex F. In some cases the same publication may have been referenced in
both a normative and an informative manner.

---------------------- Page: 9 ----------------------

SIST ETS 300 687 E1:2003
Page 8
ETS 300 687: March 1996
3 Definitions abbreviations
For the purposes of this ETS, the following definitions apply:
3.1 Definitions
Background Block Error Ratio (BBER): The ratio of errored blocks to total blocks during a fixed
measurement interval excluding all blocks during severely errored seconds and while the leased line
connection is in the unavailable state.
Background Block Error (BBE): An errored block not occurring as part of a severely errored second.
block: A block is a set of consecutive bits equivalent to one frame; each bit belongs to one and only one
block. The length of each block corresponds to a period of 125 microseconds.
errored block: A block in which one or more bits are in error.
Errored Second (ES): A one-second period with one or more errored blocks.
Errored Seconds Ratio (ESR): The ratio of errored seconds to total seconds during a fixed
measurement interval. The ESR is not evaluated while the leased line connection is in the unavailable
state.
frame: A repetitive set of consecutive bits in which the position of each bit can be identified by reference
to a frame alignment signal.
frame alignment signal: The distinctive signal inserted in every frame always occupying the same
relative position within the frame and used to establish and maintain frame alignment.
leased lines: The 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.
PRBS(223-1): A Pseudo Random Bit Sequence (PRBS) (as defined in subclause 2.2 of
ITU-T Recommendation O.151 [2])
satellite transmission: Transmission via an earth orbiting satellite.
severely disturbed period: For out-of-service measurements, a severely disturbed period occurs when,
over a period of time equivalent to four contiguous blocks, either all the contiguous blocks are affected by
a high bit error density of ≥ 10-2, or a loss of signal is observed. For in-service monitoring purposes, a
severely disturbed period is estimated by the occurrence of loss of signal or loss of frame alignment.
Severely Errored Second (SES): A one-second period which contains ≥ 30 % errored blocks or at least
one severely disturbed period.
Severely Errored Seconds Ratio (SESR): The ratio of severely errored seconds to total seconds during
a fixed measurement interval. The SESR is not evaluated while the leased line connection is in the
unavailable state.
unavailability period: An unavailability period begins at the onset of 10 consecutive SES. These 10
seconds are considered to be part of the unavailability period. The unavailability period ends at the onset
of 10 consecutive non-severely errored seconds. These 10 seconds are not considered part of the
unavailability period.
unavailable state: The leased line connection is in the unavailable state if an unavailability period is
occurring in one or both directions of transmission.

---------------------- Page: 10 ----------------------

SIST ETS 300 687 E1:2003
Page 9
ETS 300 687: March 1996
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AIS Alarm Indication Signal
BBE Background Block Error
BBER Background Block Error Ratio
BIP-8 Bit Interleaved Parity (8 bit)
BIS Bringing Into Service
CRC-7 Cyclic Redundancy Check (7 bit)
D34S 34 Mbit/s digital structured leased line
D34U 34 Mbit/s digital unstructured leased line
EM Error Monitoring
EMC ElectroMagnetic Compatibility
ES Errored Second
ESR Errored Seconds Ratio
FA1 Frame Alignment byte 1
FA2 Frame Alignment byte 2
GC General purpose Communications channel
HDB3 High Density Bipolar code 3
LSB Least Significant Bit
MA Maintenance and Adaptation
MSB Most Significant Bit
NR Network operator byte
NTP Network Termination Point
ONP Open Network Provision
ppm parts per million
PRBS Pseudo Random Bit Sequence
RDI Remote Defect Indication
REI Remote Error Indication
RPO Reference Performance Objective
RX RX is a signal input (at either the leased line interface or the test equipment)
SES Severely Errored Second
SESR Severely Errored Seconds Ratio
TM Timing Marker
TR TRail trace
TX TX is a signal output (at either the leased line interface or the test equipment)
UI Unit Interval
4 Requirements
The performance of the leased line shall comply with these requirements only if the conditions of supply of
the network equipment providing the NTP are met, (e.g. if the equipment is connected to an appropriate
power supply on the customer's premises).
The CCITT attribute technique is used to express the connection requirements. The following attributes
from CCITT Recommendation I.140 are specified in this ETS:
- Transfer rate;
- Information transfer susceptance;
- Structure;
- Establishment of connection;
- Symmetry;
- Connection configuration;
- Network performance.
The following network performance sub-attributes are considered relevant for this ETS:
- Transmission delay;
- Jitter;
- Error;
- Availability.

---------------------- Page: 11 ----------------------

SIST ETS 300 687 E1:2003
Page 10
ETS 300 687: March 1996
4.1 Attributes
The connection attributes are displayed in table 1. In effect, these attributes define the service being
offered.
The values and the associated compliance tests can be found in the subsequent subclauses.
Table 1: Connection attributes
D34U D34S
Connection type attributes Value / nature
Transfer rate
- leased line timing
34 368 kbit/s ± 20 ppm 34 368 kbit/s ± 20 ppm
- information transfer rate
34 368 kbit/s ± 20 ppm 33 920 kbit/s ± 20 ppm
Information transfer susceptance Unrestricted digital
Structure Unstructured Frame integrity
Establishment of connection Without user intervention
Symmetry Symmetrical in both directions
Connection configuration Point-to-point
Transmission delay
- terrestrial (for distance G in km) ≤ (10 + 0,01 G ) ms
- satellite
≤ 350 ms
Jitter at input port 0,4 UI from 100 Hz to 1 kHz
0,15 UI from 10 kHz to 800 kHz
Jitter at output port 1,4 UI from 100 Hz to 800 kHz
0,14 UI from 10 kHz to 800 kHz
Availability No requirement
Error parameters D34U and D34S
Terrestrial Satellite
End-to-end performance objectives.
- Errored Seconds Ratio (ESR)
≤ 3,75 % ≤ 5,850 %
- Severely Errored Seconds Ratio (SESR)
≤ 0,10 % ≤ 0,156 %
- Background Block Error Ratio (BBER)
≤ 0,01 % ≤ 0,016 %
Performance levels over a 24 hour period
- Errored Seconds (ES)
≤ 3 126 ≤ 4 912
- Severely Errored Seconds (SES)
≤ 68 ≤ 112
- Background Block Errors (BBE)
≤ 68 594 ≤ 107 170
4.1.1 Transfer rate
4.1.1.1 Leased line timing
Requirement: The leased line shall be capable of carrying user timing within the range of 34 368 kbit/s
± 20 ppm.
The leased line provider may also offer to the user in certain installations the capability for the leased line
to be synchronised to network timing.
NOTE: Network timing is timing that is derived from the source or sources of timing that are
used for the network (i.e. a national primary reference clock). Thus the timing provided
by the leased line will be similar to that provided by other digital services.
Test: The test shall be conducted according to subclause A.2.1.
4.1.1.2 Information transfer rate
Requirement: The connection shall be capable of transferring a nominal information rate, defined in
table 2.

---------------------- Page: 12 ----------------------

SIST ETS 300 687 E1:2003
Page 11
ETS 300 687: March 1996
Table 2: Information transfer rate
D34U D34S
Information transfer rate
34 368 kbit/s ± 20 ppm 33 920 kbit/s ± 20 ppm
Test: The test shall be conducted according to subclause A.2.1.
4.1.2 Information transfer susceptance
Requirement: The connection shall be capable of transferring unrestricted digital information with bit
sequence integrity at the nominal rate, defined in table 3.
Table 3: Information transfer susceptance
D34U D34S
Information transfer susceptance
34 368 kbit/s ± 20 ppm 33 920 kbit/s ± 20 ppm
Test: The test shall be conducted according to subclause A.2.1.
4.1.3 Structure
4.1.3.1 Frame integrity
The requirement of this subclause applies only to the D34S leased line.
Requirement: When a signal with the structure defined in annex B is applied to the input of the
D34S leased line, the output signal at the far end shall also conform to the structure defined in annex B
and the frame alignment byte (FA1 and FA2) shall be in the same position in relation to the contents of the
payload.
Test: The test shall be conducted according to subclause A.2.5.
4.1.3.2 Loss of input signal
Requirement: When there is no input signal to the leased line, the output signal at the far end of the
leased line shall be Alarm Indication Signal (AIS) (all ones).
Test: The test shall be conducted according to subclause A.2.6.
4.1.4 Symmetry
Requirement: The connection shall be symmetrical, i.e. each direction of transmission shall have the
same information transfer capability (D34U and D34S) and the same frame structure (D34S).
Test: The test shall be conducted according to subclause A.2.1.
4.1.5 Network performance
The network performance sub-attributes are displayed in table 1. The values and the associated
compliance tests can be found in the subsequent subclauses.
4.1.5.1 Transmission delay
Requirement: The requirement depends upon whether satellite transmission is involved in the connection
or not:
a) for connections where satellite transmission is not involved, the one way end-to-end delay shall be
less than or equal to (10 + 0,01 G) ms, where G is the geographical distance in kilometres, as
shown in figure 1; or

---------------------- Page: 13 ----------------------

SIST ETS 300 687 E1:2003
Page 12
ETS 300 687: March 1996
Delay (ms)
100
10
0
0 3000 6000 9000
Geographical distance (km)
Figure 1: Upper limit of delay
b) for connections where satellite transmission is involved, the one way end-to-end delay shall be less
than or equal to 350 ms.
NOTE: Requirements a) and b) are based on ITU-T Recommendation G.114, subclauses 2.2
and 2.3.
There are no requirements for low frequency (below 20 Hz) variation of one way end-to-end delay under
this ETS.
Test: The test shall be conducted according to subclause A.2.2.
4.1.5.2 Jitter
4.1.5.2.1 Jitter tolerance at the network input port
Requirement: The leased line shall function as specified with input jitter being the sum of the band limited
components defined in table 4.
NOTE: The jitter tolerance for the connection is defined in this way instead of specifying single
jitter frequencies, for the following reasons:
a) this method is more representative of the jitter encountered in practice; and
b) long regenerator chains may be especially sensitive to single jitter frequencies.

---------------------- Page: 14 ----------------------

SIST ETS 300 687 E1:2003
Page 13
ETS 300 687: March 1996
Table 4: Components of input jitter
Filters for generation of jitter spectrum Bandpass filter for Input jitter measured by
(first order) measurement of input bandpass filter
jitter
Lower cut-off Upper cut-off (lower cut-off first Unit Interval (UI) peak-
(high pass) (low pass) order) to-peak (maximum)
100 Hz 1 kHz 100 Hz to 800 kHz 0,4
10 kHz 800 kHz 10 kHz to 800 kHz 0,15
Test: The test shall be conducted according to subclause A.2.3.
4.1.5.2.2 Maximum jitter at the network output port
Requirement: The maximum jitter at the output port of the network shall not exceed the limits specified in
table 5, based on ITU-T Recommendation G.823, when measured with linear filters with the defined
cut-off frequencies.
At frequencies below the lower 3 dB point, the attenuation of the high pass filter shall rise with a value
greater than, or equal to, 20 dB per decade. At frequencies above the upper 3 dB point, the attenuation of
the low pass filtration shall rise with a value greater than, or equal to, 60 dB per decade.
For the measurement, the maximum input jitter as specified in subclause 4.1.5.2.1 shall be applied.
Table 5: Maximum network output jitter
Measurement filter bandwidth Output jitter
Lower cut-off Upper cut-off UI peak-to-peak
(high pass) (low pass) (maximum)
100 Hz 800 kHz 1,4
10 kHz 800 kHz 0,14
Test: The test shall be conducted according to subclause A.2.3.
4.1.5.3 Error performance
Errored seconds, severely errored seconds and background block errors shall be excluded from the
measurement of the error performance if the leased line is in the unavailable state.
NOTE: When microwave links are used in the connection it may not be possible to meet the
requirement in rare periods with very adverse propagation conditions.
The end-to-end error performance rates for a 34 Mbit/s digital leased line using terrestrial or satellite
connections are shown in table 6. These are based on the reference connections shown in annex C
derived from ITU-T Recommendation G.826 and are valid for block sizes of 4 000 to 20 000 bits.
Table 6: End-to-end error performance objectives for a 34 Mbit/s digital leased line
Performance parameter Terrestrial Satellite
ESR 3,75 % 5,850 %
SESR 0,10 % 0,156 %
BBER 0,01 % 0,016 %
These figures for the error performance are used in the derivation of the performance levels given in
subclause 4.1.5.3.2. The derivation of these figures is given in annex C.
4.1.5.3.1 Bringing Into Service (BIS) limits
There is no requirement on BIS limits under this ETS.
NOTE: Annex E provides guidelines on 24 hour and 2 hour BIS limits.

---------------------- Page: 15 ----------------------

SIST ETS 300 687 E1:2003
Page 14
ETS 300 687: March 1996
4.1.5.3.2 Performance level
The performance level of an unstructured leased line in service (i.e. carrying user data) cannot be
estimated by the leased line provider since no bit pattern sequence is known. To determine the
performance level the leased line needs to be taken out of service (the user will not have any access to
the leased line or any service provided during the measurement period). The user may also measure the
error performance of the leased line by connecting test equipment to the leased line or by using a
proprietary performance calculation facility of the terminal equipment.
The performance level of a structured leased line in service (i.e. carrying user data) can be estimated from
the Bit Interleaved Parity - 8 (BIP-8). In order for the leased line provider to perform an accurate error
measurement, the leased line may need to be taken out of service (the user will not have any access to
the leased line or any service provided during the measuring period). If a leased line provider use
...