ETSI EN 300 690 V1.2.1 (2001-07)

Access and Terminals (AT); 140 Mbit/s digital leased lines (D140U and D140S); Terminal equipment interface

REN/AT-020010

Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosno hitrost 140 Mbit/s (D140U, D140S) - Vmesnik terminalske opreme

General Information

• Status: Published
• Publication Date: 03-Jul-2001
• Technical Committee: AT Digital - AT Digital
• Current Stage: 12 - Completion
• Due Date: 06-Jul-2001
• Completion Date: 04-Jul-2001
• Mandate: T-297
• Ref Project: SIST EN 300 690 V1.2.1:2004 - Access and Terminals (AT); 140 Mbit/s digital leased lines (D140U and D140S); Terminal equipment interface

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 300 690 V1.2.1:2004
01-oktober-2004
Dostop in terminali (AT) - Digitalni zakupljeni vodi za prenosno hitrost 140 Mbit/s
(D140U, D140S) - Vmesnik terminalske opreme
Access and Terminals (AT); 140 Mbit/s digital leased lines (D140U and D140S);
Terminal equipment interface
Ta slovenski standard je istoveten z: EN 300 690 Version 1.2.1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
SIST EN 300 690 V1.2.1:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 300 690 V1.2.1:2004

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SIST EN 300 690 V1.2.1:2004
ETSI EN 300 690 V1.2.1 (2001-07)
European Standard (Telecommunications series)
Access and Terminals (AT);
140 Mbit/s digital leased lines (D140U and D140S);
Terminal equipment interface

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SIST EN 300 690 V1.2.1:2004
2 ETSI EN 300 690 V1.2.1 (2001-07)
Reference
REN/AT-020010
Keywords
access, digital, interface, leased line, ONP,
terminal
ETSI
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© European Telecommunications Standards Institute 2001.
All rights reserved.
ETSI

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SIST EN 300 690 V1.2.1:2004
3 ETSI EN 300 690 V1.2.1 (2001-07)
Contents
Intellectual Property Rights .5
Foreword.5
Introduction.6
1 Scope.7
2 References.7
3 Definitions and abbreviations.8
3.1 Definitions . 8
3.2 Abbreviations. 8
4 Requirements.9
4.1 Mechanical characteristics. 9
4.1.1 Sockets . 10
4.1.2 Plugs . 10
4.2 Electrical characteristics . 10
4.2.1 Output port . 10
4.2.1.1 Signal coding. 10
4.2.1.2 Waveform shape. 11
4.2.1.3 Output timing . 12
4.2.1.4 Output return loss . 13
4.2.1.5 Output jitter. 13
4.2.1.6 Output frame structure. 13
4.2.2 Input port. 13
4.2.2.1 Signal coding. 13
4.2.2.2 Input return loss. 14
4.2.2.3 Input loss tolerance. 14
4.2.2.4 Input jitter tolerance. 14
4.2.2.5 Input clock tolerance. 15
4.2.2.6 Input frame structure. 15
4.2.2.7 Frame alignment procedure. 15
4.3 Safety. 16
4.4 Overvoltage. 16
4.5 ElectroMagnetic Compatibility (EMC) . 16
Annex A (normative): Test methods .17
A.1 General.17
A.1.1 Additional information to support the test . 17
A.1.2 Equipment connection . 17
A.2 Test methods .18
A.2.1 Signal coding at the output port . 18
A.2.2 Waveform shape at the output port. 18
A.2.3 Output timing. 19
A.2.4 Input signal coding and loss tolerance. 20
A.2.5 Input return loss . 21
A.2.6 Output return loss. 22
A.2.7 Input and output jitter . 23
A.2.8 Frame structure . 24
A.2.9 Frame alignment procedure . 25
Annex B (normative): Definition of CMI code .27
B.1 General.27
B.2 Definition .27
ETSI

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SIST EN 300 690 V1.2.1:2004
4 ETSI EN 300 690 V1.2.1 (2001-07)
Annex C (normative): Definition of frame structure.28
C.1 Frame structure at 139 364 kbit/s .28
C.1.1 Trail access point identifier format. 29
C.1.1.1 CRC-7 calculation - multiplication and division process . 30
C.1.1.2 CRC-7 calculation - encoding procedure . 30
C.1.1.3 CRC-7 calculation - decoding procedure . 30
Annex D (normative): Requirements Table (RT).31
Annex E (informative): Bibliography.32
History .33
ETSI

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SIST EN 300 690 V1.2.1:2004
5 ETSI EN 300 690 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 resulted 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 300 686: "Access and Terminals (AT); 34 Mbit/s and 140 Mbit/s digital leased lines (D34U, D34S, D140U,
D140S); Network interface presentation";
- EN 300 688: "Access and Terminals (AT); 140 Mbit/s digital leased lines (D140U and D140S); 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

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SIST EN 300 690 V1.2.1:2004
6 ETSI EN 300 690 V1.2.1 (2001-07)
Introduction
The Council Directive on the application of 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 European Union of a minimum set of leased lines with harmonized technical characteristics.
The 140 Mbit/s unstructured and structured leased lines are not part of the minimum set of leased lines under the leased
line Directive, however these standards are being written with the intention that where 140 Mbit/s leased lines are
offered, they will be in accordance with these standards.
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 25 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 [4] were used as the basis for the terminal equipment interface aspects
of the present document.
ETSI

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SIST EN 300 690 V1.2.1:2004
7 ETSI EN 300 690 V1.2.1 (2001-07)
1 Scope
The present document specifies the mechanical and electrical characteristics (except safety, overvoltage and EMC
aspects), the necessary functional characteristics and the corresponding conformance tests for a terminal equipment
interface for:
- connection to the network termination points of 139 264 kbit/s digital unstructured leased lines (D140U); and
- connection to the network termination points of 139 264 kbit/s digital structured leased lines (D140S) which
support an unstructured 138 240 kbit/s information transfer rate.
These leased lines are defined in EN 300 686 and EN 300 688.
The present document is written only to ensure that the interface of the terminal equipment is compatible with the
140 Mbit/s digital unstructured or structured leased lines. The present document 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] IEC 60169-8 (1978): "Radio-frequency connectors. Part 8: R.F. coaxial connectors with inner
diameter of outer conductor 6,5 mm (0,256 in) with bayonet lock - Characteristic impedance
50 ohms (Type BNC)".
[2] IEC 60169-13 (1976): "Radio-frequency connectors. Part 13: R.F. coaxial connectors with inner
diameter of outer conductor 5,6 mm (0,22 in) - Characteristic impedance 75 ohms (Type 1,6/5,6) -
Characteristic impedance 50 ohms (Type 1,8/5,6) with similar mating dimensions".
[3] ISO/IEC 10173 (1998): "Information technology - Telecommunications and information exchange
between systems - Interface connector and contact assignments for ISDN primary rate access
connector located at reference points S and T".
[4] ITU-T Recommendation G.703 (1998): "Physical/electrical characteristics of hierarchical digital
interfaces".
[5] ITU-T Recommendation O.151 (1992): "Error performance measuring equipment operating at the
primary rate and above".
[6] ITU-T Recommendation O.171 (1997): "Timing jitter and wander measuring equipment for digital
systems which are based on the plesiochronous digital hierarchy (PDH)".
ETSI

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SIST EN 300 690 V1.2.1:2004
8 ETSI EN 300 690 V1.2.1 (2001-07)
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
frame: 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: 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: 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
23
PRBS(2 -1): Pseudo Random Bit Sequence (PRBS) (as defined in clause 2.2 of ITU-T Recommendation O.151)
terminal equipment: equipment intended to be connected to the public telecommunications network, i.e.:
- to be connected directly to the termination of a public telecommunication network; or
- 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
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AIS Alarm indication Signal
ASCII American Standard Code for Information Interchange
ATM Asynchronous Transfer Mode
BIP-8 Bit Interleaved Parity (8 bit)
BNC Bayonet Nut Connector
CMI Coded Mark Inversion
CRC-7 Cyclic Redundancy Check (7 bit)
dc direct current
D140S 140 Mbit/s digital structured leased line
D140U 140 Mbit/s digital unstructured leased line
EM Error Monitoring
EMC ElectroMagnetic Compatibility
FA1 Frame Alignment byte 1
FA2 Frame Alignment byte 2
GC General purpose Communications channel
LOF Loss Of Frame
LOS Loss Of Signal
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
ETSI

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SIST EN 300 690 V1.2.1:2004
9 ETSI EN 300 690 V1.2.1 (2001-07)
REI Remote Error Indication
RT Requirements Table
RX RX is a signal input (at either the terminal equipment or the test equipment, see figure 1)
SDH Synchronous Digital Hierarchy
TM Timing Marker
TR TRail trace
TTI Trail Trace Identifier
TU Tributary Unit
TUG Tributary Unit Group
TX TX is a signal output (at either the terminal equipment or the test equipment, see figure 1)
UI Unit Interval
4 Requirements
The D140U 139 264 kbit/s unstructured leased line provides a bi-directional point-to-point digital leased line for the
support of an unstructured 139 264 kbit/s information transfer rate. Any structuring of the data is the responsibility of
the user.
The D140S 139 264 kbit/s structured leased line provides a bi-directional point-to-point digital leased line for the
support of an unstructured 138 240 kbit/s information transfer rate. Any structuring of the data within the transparent
138 240 kbit/s part of the frame is the responsibility of the user.
For both D140U and D140S the provision of timing is the responsibility of the user; however, in certain installations the
leased line provider may be able to offer a leased line that is synchronized to the network.
4.1 Mechanical characteristics
The terminal equipment shall provide at least one of the methods of connection given in clauses 4.1.1 and 4.1.2.
NOTE 1: When connecting the terminal equipment to the NTP, any difference in ground potential between the two
equipments may produce a voltage across the signal ground connection and may cause damage. See
EN 50310 for details of earthing requirements within the customer's premises.
NOTE 2: 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.
NOTE 3: Normal practice is for the outer conductors of the input and output connectors to be connected via a dc
path to the signal ground and thence to ground. This connection is to reduce EMC emissions. If there is a
difference in ground potential between the terminal equipment and the NTP, this arrangement may result
in high currents in the outer conductors and cause damage.
To prevent this problem, dc isolation may be introduced between the terminal equipment and the NTP,
for example by introducing dc isolation between the outer conductor and the signal ground in the terminal
equipment. Careful attention should be given to the requirements of standards on installation earthing
practice.
ETSI

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SIST EN 300 690 V1.2.1:2004
10 ETSI EN 300 690 V1.2.1 (2001-07)
OUTPUT INPUT
TX RX
TERMINAL
NETWORK
EQUIPMENT
INTERFACE
INTERFACE
RX TX
INPUT OUTPUT
Figure 1
4.1.1 Sockets
Requirement: The terminal equipment interface shall provide two coaxial 75 Ω sockets, one each for transmit and
receive; these sockets being either:
a) 75 Ω sockets (type 1,6/5,6) complying with IEC 60169-13 [2]; or
b) 75 Ω BNC sockets complying with the general requirements of IEC 60169-8 [1] with the mating dimensions
specified in annex B of ISO/IEC 10173 [3].
The outer conductor of the coaxial pair shall be connected to signal ground both at the input port and at the output port.
Test: There shall be a visual inspection that the sockets are of the correct type.
4.1.2 Plugs
Requirement: The terminal equipment interface shall provide two coaxial 75 Ω plugs at the end of a cord (or cords),
one each for transmit and receive; these plugs being either:
a) 75 Ω plugs (type 1,6/5,6) complying with IEC 60169-13 [2]; or
b) 75 Ω BNC plugs complying with the general requirements of IEC 60169-8 [1] with the mating dimensions
specified in annex B of ISO/IEC 10173 [3].
The outer conductor of the coaxial pair shall be connected to signal ground both at the input port and at the output port.
NOTE: There is no requirement on the method of connection of the cord (or cords) to the terminal equipment.
Test: There shall be a visual inspection that the plugs are of the correct type.
4.2 Electrical characteristics
4.2.1 Output port
4.2.1.1 Signal coding
Requirement: The signal transmitted at the output port shall comply with the Coded Mark Inversion (CMI) encoding
rules (see annex B).
Test: The test shall be conducted according to clause A.2.1.
ETSI

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SIST EN 300 690 V1.2.1:2004
11 ETSI EN 300 690 V1.2.1 (2001-07)
4.2.1.2 Waveform shape
Requirement: The pulse at the output port shall comply with the requirements given in figures 2 and 3 and table 1;
based on ITU-T Recommendation G.703 [4].
Table 1: Waveform shape at output port
Pulse shape Nominally rectangular and conforming with the masks shown in
figures 2 and 3
Test load impedance
75 Ω non-reactive
Peak to peak voltage 1,0 ± 0,1 V
Rise time between 10 % and 90 % ≤ 2ns
amplitudes of the measured steady state
amplitude
Transition timing tolerance (referred to the Negative transitions: ±0,1 ns
mean value of the 50 % amplitude points Positive transitions at unit interval boundaries: ±0,5 ns
of the negative transition) Positive transitions at mid-interval: ±0,35 ns
NOTE 1: The maximum "steady state" amplitude shall not exceed the 0,55 V limit. Overshoots and other transients
are permitted to fall into the dotted area, bounded by the amplitude levels 0,55 V and 0,60 V, provided they
do not exceed the steady state level by more than 0,05 V.
NOTE 2: The rise time and decay time shall be measured between -0,4 V and 0,4 V and shall not exceed 2 ns.
Figure 2: Mask of a pulse corresponding to a binary 0
ETSI

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SIST EN 300 690 V1.2.1:2004
12 ETSI EN 300 690 V1.2.1 (2001-07)
T = 7,18 ns
V
0,60
(see note 1) (see note 1)
0,55
0,50
1ns
0,45
1ns
0,40
0,1 ns 0,1 ns
0,5 ns 0,5 ns
Nominal 0,05
zero level
-0,05
3,59 ns 3,59 ns
1,35 ns 1,35 ns
1ns 1ns
-0,40
1,795 ns 1,795 ns
-0,45
-0,50
(see note 1)
-0,55
-0,60
Negative
Positive
transition
transition
NOTE 1: The maximum "steady state" amplitude shall not exceed the 0,55 V limit. Overshoots and other transients
are permitted to fall into the dotted area, bounded by the amplitude levels 0,55 V and 0,60 V, provided they
do not exceed the steady state level by more than 0,05 V.
NOTE 2: The inverse pulse shall have the same characteristics, noting that the timing tolerance at the level of the
negative and positive transitions are ±0,1 ns and ±0,5 ns respectively.
NOTE 3: The rise time and decay time shall be measured between -0,4 V and 0,4 V and shall not exceed 2 ns.
Figure 3: Mask of a pulse corresponding to a binary 1
Test: The test shall be conducted according to clause A.2.2.
4.2.1.3 Output timing
The terminal equipment may derive its timing from:
a) an internal source (e.g. an internal clock);
b) an external reference signal input;
c) the received signal at the input port.
Requirement: For each of the timing arrangements intended for use, the bit rate at the output port shall be within the
limits of 139 264 kbit/s ± 15 parts per million (ppm), when any relevant external signal, including the received signal at
the input port, is within its stated tolerance.
NOTE: The tolerance of ±15 ppm relates to the transmission capability of the leased line. Tighter limits may be
needed to ensure satisfactory end to end interworking with the distant terminal equipment.
Test: The test shall be conducted according to clause A.2.3.
ETSI

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SIST EN 300 690 V1.2.1:2004
13 ETSI EN 300 690 V1.2.1 (2001-07)
4.2.1.4 Output return loss
Requirement: The output return loss at the terminal equipment interface, with respect to 75 Ω, shall be greater than or
equal to the values given in table 2, which is taken from clause 12.2 of ITU-T Recommendation G.703 [4].
Table 2: Output port minimum return loss
Frequency range Return loss
7MHzto210MHz 15dB
Test: The test shall be conducted according to clause A.2.6.
4.2.1.5 Output jitter
Requirement: The peak-to-peak output jitter shall not exceed the limits of table 3 when measured with a bandpass
filter with linear cut-off 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 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.
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 (high pass) Upper cut-off (low pass) Unit Interval (UI)
peak-to-peak (maximum)
200 Hz 3 500 kHz 0,4
10 kHz 3 500 kHz 0,075
Test: The test shall be conducted according to clause A.2.7.
4.2.1.6 Output frame structure
The requirement of this clause applies to termi
...