ETSI ETS 300 012-4 ed.2 (1998-10)

SLOVENSKI STANDARD
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Osnovni vmesnik uporabnik-
omrežje (UNI) – 4. del: Specifikacija za preskušanje skladnosti za vmesnik IA
Integrated Services Digital Network (ISDN); Basic User-Network Interface (UNI); Part 4:
Conformance test specification for interface IA
Ta slovenski standard je istoveten z: ETS 300 012-4 Edition 2
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 012-4
TELECOMMUNICATION October 1998
STANDARD Second Edition
Source: TM Reference: RE/TM-03038-4
ICS: 33.020
Key words: Basic, ISDN, layer 1, testing, transmission, UNI
Integrated Services Digital Network (ISDN);
Basic User Network Interface (UNI);
Part 4: Conformance test specification for interface I
A
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
Internet: secretariat@etsi.fr - http://www.etsi.fr - http://www.etsi.org
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
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 1998. All rights reserved.

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ETS 300 012-4: October 1998
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 Standards Making Support Dept." at the address shown on the title page.

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ETS 300 012-4: October 1998
Contents
Foreword .7
1 Scope .9
2 Normative References .9
3 Definitions, symbols and abbreviations.10
3.1 Definitions .10
3.2 Symbols .11
3.3 Abbreviations .11
4 Allocation of tests .12
4.1 Scope.12
4.2 References .12
4.3 Definitions, symbols and abbreviations.13
4.4 Primitives associated with layer 1 .13
4.5 Wiring configurations and location of interface points .14
4.6 Functional characteristics .14
4.7 Interface procedures.14
4.8 Electrical characteristics .16
4.9 Power feeding.17
4.10 Interface connector contact assignment.18
4.11 Annexes.19
5 Functional characteristic tests.19
5.1 Binary organization of frame.19
5.1.1 Test A.20
5.1.2 Test B.21
6 Interface procedure tests .21
6.1 D-channel access control procedure .21
6.1.1 Interframe (layer 2) time fill.22
6.1.2 D-echo channel response .22
6.2 Activation/deactivation .23
6.2.1 Activation/deactivation procedure .23
6.2.2 Timer for activation/deactivation.25
6.2.2.1 Timer for activation when receiving INFO 2 .25
6.2.2.1.1 Test A in state F3.25
6.2.2.1.2 Test B in state F4.25
6.2.2.2 Timer for activation when receiving INFO 4 .26
6.2.2.2.1 Test A in state F3.26
6.2.2.2.2 Test B in state F4.26
6.2.2.3 Timer for activation when receiving any signal.27
6.2.2.4 Value of the timer T3 .27
6.2.2.5 Timer for physical deactivation .27
6.2.2.5.1 Test A in state F6.27
6.2.2.5.2 Test B in state F7.28
6.2.2.6 Timer for complete deactivation .28
6.2.2.6.1 Test A in state F7.28
6.2.2.6.2 Test B in state F8.29
6.3 Frame alignment procedures.30
6.4 Multi-framing procedures.30
6.5 Idle channel code on the B-channels.31
7 Electrical characteristics tests .31
7.1 Frame rate when transmitting an INFO 1 .32
7.2 TE jitter characteristics .33
7.2.1 TE jitter measurement characteristics (test A).33

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ETS 300 012-4: October 1998
7.2.2 TE output phase deviation (test B) . 34
7.3 TE transmitter output impedance. 35
7.3.1 Test A . 35
7.3.2 Test B . 35
7.3.3 Test C . 36
7.3.4 Test D . 37
7.3.5 Test E . 37
7.4 Pulse shape and amplitude. 38
7.5 Pulse unbalance. 38
7.5.1 Pulse amplitude . 38
7.5.2 Pulse unbalance of an isolated couple of pulses. 39
7.6 Voltage on other test loads. 40
7.6.1 Test A . 40
7.6.2 Test B . 41
7.7 Longitudinal conversion loss of transmitter output. 41
7.8 Receiver input characteristics . 42
7.8.1 TE receiver input impedance. 42
7.8.1.1 Test A. 42
7.8.1.2 Test B. 43
7.8.1.3 Test C . 43
7.8.1.4 Test D . 44
7.8.2 Receiver sensitivity - noise and distortion immunity . 44
7.8.3 Unbalance about earth of receiver input. 45
8 Power feeding`. 46
8.1 Power source 1 phantom mode . 46
8.1.1 Normal power conditions . 46
8.1.1.1 Normal power provision (Test A) . 46
8.1.1.2 Normal power provision (Test B) . 47
8.1.1.3 Normal power provision (Test C) . 48
8.1.1.4 Normal power provision (Test D) . 48
8.1.1.5 Normal power provision (Test E) . 49
8.1.2 Restricted power conditions. 50
8.1.2.1 Restricted power provision (Test A). 50
8.1.2.2 Restricted power provision (Test B). 50
8.1.2.3 Restricted power provision (Test C). 51
8.1.2.4 Restricted power provision (Test D). 52
8.1.2.5 Restricted power provision (Test E). 52
8.1.2.6 Restricted power provision (Test F). 53
8.1.3 Current transient. 54
8.1.4 Limitation on power sink during transient conditions . 55
8.1.4.1 Current/time limitation for TE . 55
8.1.4.2 Current/time limitation for TE when connecting . 56
8.1.4.3 Behaviour of a TE using a connection detector . 57
8.1.4.4 Power start-up test. 58
8.1.4.4.1 Power start-up test after removal of
short-circuit. 58
8.1.4.4.2 Power start-up test at low input
voltage. 59
8.1.4.5 Protection against short-term interruptions. 60
8.1.4.5.1 Normal power. 60
8.1.4.5.2 Restricted power . 61
8.1.4.6 Behaviour at the switch-over. 62
8.1.4.6.1 Normal power. 62
8.1.4.6.2 Restricted power . 62
8.1.4.7 dc unbalance of TEs using power sink 1 . 63
8.1.4.8 Effect of current unbalance. 64
8.2 Power source 2 - optional third pair. 65
8.3 Galvanic isolation . 66
Annex A (normative): Connection cords and general testing requirements . 67
A.1 Connection cords. 67

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ETS 300 012-4: October 1998
A.2 General testing requirements.67
History.68

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ETS 300 012-4: October 1998
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ETS 300 012-4: October 1998
Foreword
This second edition European Telecommunication Standard (ETS) has been produced by the ETSI
Technical Committee Transmission and Multiplexing (TM).
This ETS concerns the basic User Network Interface (UNI) for the Integrated Services Digital Network
(ISDN) and consists of 7 parts as follows:
Part 1: "Layer 1 specification";
Part 2: "Implementation Conformance Statement (ICS) and Implementation eXtra Information for
Testing (IXIT) specification for interface I ";
A
Part 3: "Implementation Conformance Statement (ICS) and Implementation eXtra Information for
Testing (IXIT) specification for interface I ";
B
Part 4: "Conformance test specification for interface I ";
A
Part 5: "Conformance test specification for interface I ";
B
Part 6: "Abstract Test Suite (ATS) specification for interface I ";
A
Part 7: "Abstract Test Suite (ATS) specification for interface I ";
B
and is based on ITU-T Recommendation I.430 [7].
Transposition dates
Date of adoption of this ETS: 18 September 1998
Date of latest announcement of this ETS (doa): 31 January 1999
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 July 1999
Date of withdrawal of any conflicting National Standard (dow): 31 July 1999

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ETS 300 012-4: October 1998
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ETS 300 012-4: October 1998
1 Scope
This part 4 of ETS 300 012 provides the test principles for the requirements of this ETS used to determine
the compliance of an Implementation Under Test (IUT) to this ETS.
It is outside the scope of this ETS to identify the specific tests required by an implementation where
equipment has to meet attachment approval.
Detailed test equipment accuracy and the specification tolerance of the test devices is not a subject of this
ETS. Where such details are provided then those test details are to be considered as being an
"informative" addition to the test description.
Unless otherwise stated, conformance tests described in this ETS do not apply to the Auxiliary Power
Supply (APS).
This ETS is applicable to interface I . The field of applicability is reported at the beginning of each test.
A
Ideal values for components and circuits are considered in the test principles.
Details concerning connection cords and general testing requirements can be found in annex A of this
ETS.
2 Normative References
This ETS incorporates by dated and 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 G.117 (1988): "Transmission aspects of unbalance
about earth".
[2] EN 60603-7 (1993): "Connectors for frequencies below 3 MHz for use with
printed boards - Part 7: Detail specification for connectors, 8-way, including fixed
and free connectors with common mating features; (IEC 603-7:1990)".
[3] ETS 300 012-1 (1998): "Integrated Services Digital Network (ISDN); Basic User
Network Interface (UNI); Part 1: Layer 1 specification".
[4] ETS 300 047-3 (1992): "Integrated Services Digital Network (ISDN); Basic
access - safety and protection; Part 3: Interface I - protection".
A
[5] ETS 300 102-1 (1990): "Integrated Services Digital Network (ISDN);
User-network interface layer 3; Specifications for basic call control".
[6] ITU-T Recommendation I.411 (1993): "ISDN user-network interfaces; Reference
configurations".
[7] ITU-T Recommendation I.430 (1995): "Basic user-network interface; Layer 1
specification".
[8] ITU-T Recommendation X.200 (1994): "Information technology; Open Systems
Interconnection; Basic reference model: The basic model".

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ETS 300 012-4: October 1998
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of this ETS the following definitions, together with those given in annex E of
ITU-T Recommendation I.430 [7] and in ITU-T Recommendation I.411 [6] apply:
basic access: A user-network access arrangement that corresponds to the interface structure composed
of two B-channels and one D-channel. The bit rate of the D-channel for this type of access is 16 kbit/s.
B-channel: This function provides for the bidirectional transmission of independent B-channel signals
each having a bit rate of 64 kbit/s.
bearer service: A type of telecommunication service that provides the capability for the transmission of
signals between user-network interfaces.
NOTE 1: The ISDN connection type used to support a bearer service may be identical to that
used to support other types of telecommunication service.
connection management entity: An entity for the purpose of management of resources that have an
impact on an individual data link connection.
D-channel: This function provides for bidirectional transmission of one D-channel signal at a bit rate of
16 kbit/s.
designated terminal: A terminal which is permitted to draw power from power source 1 under both
normal and restricted power conditions.
frame alignment: This function provides information to enable the TE or NT to recover the time-division
multiplexed channels.
Integrated Services Digital Network (ISDN): A network that provides or supports a range of different
telecommunications services and provides digital connections between user-network interfaces.
interface I : User side of the ISDN user-network interface for the basic access.
A
interface I : Network side of the ISDN user-network interface for the basic access.
B
Network Termination (NT): An equipment providing interface I .
B
NOTE 2: This term is used in this ETS to indicate network-terminating aspects of NT1, NT2 and
PS1 functional groups where these have an I interface.
B
Network Termination type 1 (NT1): This functional group includes functions broadly equivalent to layer 1
(physical) of the Open Systems Interconnection (OSI) reference model. These functions are associated
with the proper physical and electromagnetic termination of the network. NT1 functions are:
- line transmission termination;
- layer 1 maintenance functions and performance monitoring;
- timing;
- power transfer;
- layer 1 multiplexing;
- interface termination, including multidrop termination;
- employing layer 1 contention resolution.

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ETS 300 012-4: October 1998
Network Termination type 2 (NT2): This functional group includes functions broadly equivalent to layer 1
and higher layers of the ITU-T Recommendation X.200 [8] reference model. Private Automatic Branch
Exchanges (PABXs), Local Area Networks (LANs), and terminal controllers are examples of equipment or
combinations of equipment that provide NT2 functions. NT2 functions include:
- layer 2 and 3 protocol handling;
- layer 2 and 3 multiplexing;
- switching;
- concentration;
- maintenance functions;
- interface termination and other layer 1 functions.
non-designated terminal: A terminal which is only permitted to draw power from power source 1 under
normal power conditions.
normal power condition: The condition indicated by the normal polarity of the phantom voltage at the
access leads, i.e. where the voltage of the transmit leads c and d on the TE is positive with respect to the
voltage on the receive leads e and f.
Power Source 1 (PS1): Power source for the provision of remote power feeding of TE via a phantom
circuit of the interface wires.
restricted power condition: The condition indicated by the reversed polarity of the phantom voltage at
the access leads, i.e. where the voltage of the receive leads e and f on the TE is positive with respect to
the voltage on the transmit leads c and d.
simulator: Device generating the stimulus signal for the IUT and monitoring the signal transmitted by the
IUT to find the result.
Terminal Adapter (TA): An equipment with interface I and one or more auxiliary interfaces that allow
A
non-ISDN terminals to be served by an ISDN user-network interface (see also
ITU-T Recommendation I.411 [6]).
Terminal Equipment (TE): An equipment with interface I and consisting of one or more functional
A
blocks.
NOTE 3: This term is used in this ETS to indicate terminal-terminating aspects of TE1, TA and
NT2 functional groups, where these have an I interface.
A
Terminal Equipment Type 1 (TE1): This functional group includes functions belonging to the functional
group TE, and with an interface that complies with the ISDN user-network interface recommendation.
3.2 Symbols
For the purposes of this ETS, the following symbols apply:
ONE Binary "1"
ZERO Binary "0"
3.3 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
APS Auxiliary Power Supply
dc direct current
ETS European Telecommunication Standard
HDLC High level Data Link Control
I Informative
I Interface point A
A
I Interface point B
B
ICS Implementation Conformance Statement
ISDN Integrated Services Digital Network

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ETS 300 012-4: October 1998
IUT Implementation Under Test
IXIT Implementation eXtra Information for Testing
LCL Longitudinal Conversion Loss
N Normative
N/R Not Relevant
NT Network Termination
ppm parts per million
PS1 Power Source 1
PS2 Power Source 2
PTNX Private Telecommunication Network Exchange
Rx Receive
Tx Transmit
UI Unit Interval (Layer 1)
4 Allocation of tests
4.1 Scope
Scope Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Scope 1 N/R
4.2 References
References Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
References 2 N/R
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ETS 300 012-4: October 1998
4.3 Definitions, symbols and abbreviations
Definitions, symbols and abbreviations Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Definitions, symbols and abbreviations 3 N/R
Definitions 3.1 N/R
General definitions 3.1.1 N/R
Interface 3.1.1.1 N/R
NT 3.1.1.2 N/R
TE 3.1.1.3 N/R
Definition of services 3.1.2 N/R
Services required from the physical medium 3.1.2.1 N/R
Services provided to layer 2 3.1.2.2 N/R
Transmission capability 3.1.2.2.1 N/R
Activation/deactivation 3.1.2.2.2 N/R
D-channel access 3.1.2.2.3 N/R
Maintenance 3.1.2.2.4 N/R
Status indication 3.1.2.2.5 N/R
Primitives between layer 1 and other entities 3.1.3 N/R
Modes of operation 3.1.4 N/R
Point-to-point operation 3.1.4.1 N/R
Point-to-multipoint operation 3.1.4.2 N/R
Definitions of states 3.1.5 N/R
TE states 3.1.5.1 N/R
State F1 (inactive) 3.1.5.1 6.2.1
State F2 (sensing) 3.1.5.1 6.2.1
State F3 (deactivated) 3.1.5.1 6.2.1
State F4 (awaiting signal) 3.1.5.1 6.2.1
State F5 (identifying input) 3.1.5.1 6.2.1
State F6 (synchronized) 3.1.5.1 6.2.1
State F7 (activated) 3.1.5.1 6.2.1
State F8 (lost framing) 3.1.5.1 6.2.1
NT states 3.1.5.2 N/R
State G1 (deactivated) 3.1.5.2 N/R
State G2 (pending activation) 3.1.5.2 N/R
State G3 (activated) 3.1.5.2 N/R
State G4 (pending deactivation) 3.1.5.2 N/R
Symbols 3.2 N/R
Abbreviations 3.3 N/R
4.4 Primitives associated with layer 1
Primitives associated with layer 1 Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Primitives associated with layer 1 4 N/R

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ETS 300 012-4: October 1998
4.5 Wiring configurations and location of interface points
Modes Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Wiring configurations and location of interface points 5 N/R
General 5.1 N/R
Point-to-point configuration 5.1.1 N/R
Point-to-multipoint configuration 5.1.2 N/R
Location of the interfaces 5.1.3 N/R
Support of wiring configurations 5.2 N/R
Wiring polarity integrity 5.2.1 6.2.2.1.1
NT and TE associated wiring 5.2.2 N/R
4.6 Functional characteristics
Functions Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Functional characteristics 6 N/R
Interface functions 6.1 N/R
B-channel 6.1.1 5.1.1
Bit timing 6.1.2 5.1.1
Octet timing 6.1.3 5.1.1
Frame alignment 6.1.4 6.3
D-channel 6.1.5 6.1.2
D-channel access procedure 6.1.6 6.1.2
Power feeding 6.1.7 8
Deactivation 6.1.8 6.3.2
Activation 6.1.9 6.3.2
Interchange circuits 6.2 5.1.1
Connected/disconnected indication 6.3 6.2
TEs powered across the interface 6.3.1 6.2
TEs not powered across the interface 6.3.2 6.2
Indication of connection status 6.3.3 6.2
Frame structure 6.4 5.1.1
Bit rate 6.4.1 7.1
Binary organization of the frame 6.4.2 5.1.1
TE to NT 6.4.2.1 5.1.1
NT to TE 6.5.2.2 N/R
Relative bit positions 6.4.2.3 5.1.1
Line code 6.5 5.1.1
Timing considerations 6.6 5.1.1
4.7 Interface procedures
D-channel access Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Interface procedures 7 N/R
D-channel access procedure 7.1 N/R
Interframe (layer 2) time fill 7.1.1 6.1.1
D-echo channel 7.1.2 N/R
D-channel monitoring 7.1.3 6.1.2
Priority mechanism 7.1.4 6.1.2
Collision detection 7.1.5 6.1.2

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ETS 300 012-4: October 1998
Activation/deactivation Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Activation/deactivation 7.2 6.2
Activate primitives 7.2.1 6.2
Deactivate primitives 7.2.2 6.2
Management primitives 7.2.3 6.2
Valid primitive sequences 7.2.4 6.2
Signals 7.3 6.2
Activation/deactivation procedure for TEs 7.4 6.2
General TE procedures 7.4.1 6.2.1
Specification of the procedures 7.4.2 6.2.1, 6.2.2.6, 6.2.2.6.1,
6.2.2.6.2
Activation/deactivation for NTs 7.5 N/R
Non-activating/non-deactivating NTs 7.5.1 N/R
Timer values 7.6 6.2.2.4
Activation times 7.7 N/R
TE activation times 7.7.1 6.2.2.1.1, 6.2.2.1.2,
6.2.2.2, 6.2.2.2.1,
6.2.2.2.2, 6.2.2.3
NT activation times 7.7.2 N/R
Deactivation times 7.8 6.2.2.5, 6.2.2.5.1,
6.2.2.5.2
Frame alignment Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Frame alignment procedures 8 N/R
Frame alignment procedure in the direction NT to TE 8.1 N/R
Loss of frame alignment 8.1.1 6.3
Frame alignment 8.1.2 6.3
Frame alignment in the direction TE to NT 8.2 N/R
Loss of frame alignment 8.2.1 N/R
Frame alignment 8.2.2 N/R
Multi-framing 8.3 6.4
Idle channel code on the B-channels 8.4 6.5

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ETS 300 012-4: October 1998
4.8 Electrical characteristics
Functions Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Electrical characteristics 9 N/R
Bit rate 9.1 N/R
Nominal rate 9.1.1 7.1
Tolerance 9.1.2 7.1
Jitter and bit-phase relationship between TE input and output 9.2 N/R
Test configurations 9.2.1 7.2.1, 7.8.2
Timing extraction jitter 9.2.2 7.2.1
Total phase deviation input to output 9.2.3 7.2.2
NT jitter characteristics 9.3 N/R
Termination of the line 9.4 N/R
Transmitter output characteristics 9.5 N/R
Transmitter output impedance 9.5.1 N/R
NT transmitter output impedance 9.5.1.1 N/R
TE transmitter output impedance 9.5.1.2 7.3
Test load impedance 9.5.2 N/R
Pulse shape and amplitude (binary ZERO) 9.5.3 7.4
Pulse shape 9.5.3.1 7.4
Nominal pulse amplitude 9.5.3.2 7.4
Pulse unbalance 9.5.4 N/R
Pulse amplitude when transmitting a high density pattern 9.5.4.1 7.5.1
Pulse unbalance of an isolated couple of pulses 9.5.4.2 7.5.2
Voltage on other test loads (TE only) 9.5.5 7.6
9.5.5.1 7.6.1
400 W load
9.5.5.2 7.6.2
5,6 W load
Unbalance about earth 9.5.6 7.7
Longitudinal conversion loss 9.5.6.1 7.7
Output signal balance 9.5.6.2 N/R
Receiver input characteristics 9.6 N/R
Receiver input impedance 9.6.1 N/R
TE receiver input impedance 9.6.1.1 7.8.1
NT receiver input impedance 9.6.1.2 N/R
Receiver sensitivity - Noise and distortion immunity 9.6.2 7.8.2
TEs 9.6.2.1 7.8.2
NTs for short passive bus (fixed timing) 9.6.2.2 N/R
NTs for both point-to-point and short passive bus configurations 9.6.2.3 N/R
(adaptive timing)
NTs for extended passive bus wiring configurations 9.6.2.4 N/R
NTs for point-to-point configurations only 9.6.2.5 N/R
NT receiver input delay characteristics 9.6.3 N/R
NT for short passive bus 9.6.3.1 N/R
NT for both point-to-point and passive bus 9.6.3.2 N/R
NT for extended passive bus 9.6.3.3 N/R
NT for point-to-point only 9.6.3.4 N/R
Unbalance about earth 9.6.4 7.8.3
Isolation from external voltages 9.7 N/R
Interconnecting media characteristics 9.8 N/R
Standard ISDN basis access TE cord 9.9 A.1

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ETS 300 012-4: October 1998
4.9 Power feeding
Static requirements Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Power feeding 10 N/R
Reference configuration 10.1 N/R
Functions specified at the access leads 10.1.1 5.1.1, 8.1.1.1
Provision of power sources and sinks 10.1.2 N/R
Power available from NT 10.2 N/R
Power source 1 normal and restricted mode 10.2.1 N/R
Minimum voltage at NT from power source 1 10.2.2 N/R
Normal power conditions 10.2.2.1 N/R
Restricted power conditions 10.2.2.2 N/R
Minimum voltage of power source 2 10.2.3 N/R
Power available at a TE 10.3 N/R
Power source 1 - phantom mode 10.3.1 N/R
Normal power 1 - phantom mode 10.3.1.1 N/R
Restricted power conditions 10.3.1.2 N/R
Power source 2 - optional third pair 10.3.2 N/R
Normal power conditions 10.3.2.1 8.2
Restricted power conditions 10.3.2.2 8.2
Power source 1 consumption 10.4 8.1
Normal power conditions 10.4.1 8.1.1, 8.1.1.1, 8.1.1.2,
8.1.1.3, 8.1.1.4, 8.1.1.5
Restricted power conditions 10.4.2 8.1.2
Power available to a TE "designated" for restricted power 10.4.2.1 8.1.2.1, 8.1.2.2, 8.1.2.3
operation
Power available to "non-designated" TEs 10.4.2.2 8.1.2.4, 8.1.2.5, 8.1.2.6
Galvanic isolation 10.5 8.3
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ETS 300 012-4: October 1998
Dynamic requirements Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Current transient 10.6 8.1.4
Current/time limitations for TEs 10.6.1 8.1.4.1, 8.1.4.2, 8.1.4.3
TE design to minimize power disturbance 10.6.2 8.1.4.1, 8.1.4.2, 8.1.4.3
Optimized current/time mask 10.5.2.1 8.1.4.1, 8.1.4.2, 8.1.4.3
Alternative current/time mask for optimized TEs 10.6.2.2 8.1.4.1, 8.1.4.2, 8.1.4.3
Power source switch-over 10.6.3 N/R
Power source switch-over time 10.6.3.1 N/R
Restricted mode power source requirements under overload 10.5.3.2 N/R
conditions
Other TE requirements 10.6.4 N/R
Minimum TE start-up current 10.6.4.1 8.1.4.4.1
Protection against short term interruptions 10.6.4.2 8.1.4.5
Behaviour at switch-over 10.6.4.3 8.1.4.6
Other power source requirements 10.6.5 N/R
Power source 1 restricted 10.6.5.1 N/R
Power source 1 normal 10.6.5.2 N/R
Requirements for type (a) source 10.6.5.3 N/R
Requirements for both types of sources 10.6.5.4 N/R
Switch-on surge capability 10.6.5.4.1 N/R
TE connection surge capability 10.6.5.4.2 N/R
Current unbalance 10.7 N/R
Direct current unbalance 10.7.1 N/R
dc unbalance of power source 1 10.7.1.1 N/R
dc unbalance of power sink 1 10.7.1.2 8.1.4.7
Differential resistance in a pair of the installation wiring 10.7.1.3 N/R
Current unbalance in a pair 10.7.2 8.1.4.8
Additional requirements for an APS 10.8 N/R
Power available for an APS 10.8.1 N/R
APS switch-on time 10.8.2 N/R
APS switch-off time 10.8.3 N/R
APS power consumption when off 10.8.4 8.1.1.4, 8.1.4
Dynamic behaviour of an APS 10.8.5 N/R
Additional requirements for NT1 restricted mode source for 10.9 N/R
compatibility with an APS
Power source 1 restricted mode back-off 10.9.1 N/R
Power source 1 restricted mode power up 10.9.2 N/R
NT1 power consumption from APS normal mode 10.9.3 N/R
4.10 Interface connector contact assignment
Requirements Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Interface connector contact assignments 11 5.1.1, 8.1.1.1

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ETS 300 012-4: October 1998
4.11 Annexes
Requirements Clause / Test defined in
subclause in clause / subclause of
ETS 300 012-1 [3] this ETS
Wiring configurations and round trip delay considerations used Annex A N/R
as a basis for electrical characteristics
Introduction A.1 N/R
Wiring configurations A.2 N/R
Point-to-multipoint A.2.1 N/R
Short passive bus A.2.1.1 N/R
Extended passive bus A.2.1.2 N/R
Point-to-point A.2.2 N/R
Test configurations Annex B N/R
Test loopbacks defined for the basic user-network interface Annex C N/R
Introduction C.1 N/R
Loopback mechanism definitions C.2 N/R
Test loopback reference configuration C.3 N/R
Test loopback characteristics C.4 N/R
Additional requirements applicable to the (explicite) S reference Annex D N/R
point
Introduction D.1 N/R
References D.2 N/R
Definitions D.3 N/R
Private network termination D.3.1 N/R
Terminal equipment D.3.2 N/R
Conformance D.4 N/R
Requirements D.5 N/R
Provision of power D.6 N/R
SDL representation of activation/deactivation procedures for Annex F N/R
TEs and NTs
SDL representation of activation/deactivation procedures for F.1 N/R
TEs which can detect power source 1 or power source 2
SDL representation of activation/deactivation procedures for F.2 N/R
NTs
Multi-framing mechanism Annex G N/R
Multi-framing G.1 N/R
General mechanism G.1.1 N/R
Q-bit position identification algorithm G.1.2 N/R
TE multiframe identification G.1.3 N/R
S-channel structuring algorithm G.2 N/R
5 Functional characteristic tests
5.1 Binary organization of frame
Reference: ETS 300 012-1 [3], subclause 6.4.2.

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ETS 300 012-4: October 1998
5.1.1 Test A
Reference: ETS 300 012-1 [3], subclauses 6.1.1, 6.1.2, 6.1.3, 6.4, 6.4.2, 6.4.2.1, 6.5, 6.6 and 11.
Purpose: To check the binary organization of INFO 3 frames.
Rx
Tx
NETW ORK
SIMULATOR
AND
IUT
TEST
APPARATUS
Rx Tx
Figure 1: Test configuration
System state: Activated by the network simulator (state F7). IUT transmitting a pseudo-random
data pattern (word length ‡ 2 -1) in the B-channels and idle channel code or
messages in the D-channel.
Stimulus: INFO 4 type frames from the NT simulator. F bit set to binary ZERO.
A
NOTE: If the IUT does not provide a loopback, an access to the B-channel of the IUT is used
for sending pseudo-random pattern (see clause A.2).
Monitor: The frame structure from the TE (positive pulses, negative pulses and bit and
frame timing are available).
Results: See table 1.
Table 1: Results of test
BIT POSITION DESCRIPTION POLARITY
1 F-bit positive pulse
2 L-bit negative pulse
3-10 B1 octet first binary ZERO coded negative, the following bits may
be positive, negative or no pulse
11 L-bit positive or no pulse
12 D-bit negative or no pulse
13 L-bit positive or no pulse
14 F negative pulse
A
15 L-bit positive pulse
16-23 B2 octet first binary ZERO coded negative, the following bits may
be positive, negative or no pulse
24 L-bit positive or no pulse
25 D-bit negative or no pulse
26 L-bit positive or no pulse
27-34 B1 octet first binary ZERO coded negative, the following bits may
be positive, negative or no pulse
35 L-bit positive or no pulse
36 D-bit negative or no pulse
37 L-bit positive or no pulse
38-45 B2 octet first binary ZERO coded negative, the following bits may
be positive, negative or no pulse
46 L-bit positive or no pulse
47 D-bit negative or no pulse
48 L-bit positive or no pulse
NOTE 1: L = balance bit which is used to ensure even parity of data fields.
NOTE 2: See figure 3, subclause 6.4.2 of ETS 300 012-1 [3] for details of pulse polarity.
NOTE 3: Multi-framing procedure is not covered by this test.

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ETS 300 012-4: October 1998
5.1.2 Test B
Reference: ETS 300 012-1 [3], subclause 7.3.
Purpose: To check the binary organization of INFO 1 frames.
Rx
Tx
NETW ORK
SIMULATOR
AND
IUT
TEST
APPARATUS
Rx Tx
Figure 2: Test configuration
System state: Awaiting signal (state F4).
Stimulus: Activation request from the IUT (PH-AR).
Monitor: Line signals.
Results: Check that the 9 bit pattern is contiguous and of the appropriate polarity.
5 789
12 3 4 6
41,667 μs
8 x UI
6 Interface procedure tests
These tests are designed to test conformance to the specification of the interface procedures described in
ETS 300 012-1 [3], clause 7. The tests are performed by stimulating and monitoring the TE from the bus
at the T reference point and from activation requests of the user.
6.1 D-channel access control procedure
Reference: ETS 300 012-1 [3], subclause 7.1.

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ETS 300 012-4: October 1998
6.1.1 Interframe (layer 2) time fill
Reference: ETS 300 012-1 [3], subclause 7.1.1.
Purpose: To check the D-channel contains the correct interframe time fill from the TE.
Rx
Tx
NETW ORK
SIMULATOR
AND
IUT
TEST
APPARATUS
Rx Tx
Figure 3: Test configuration
System state: Activated (state F7).
The layer 2 shall be in a state where it does not attempt to transmit any data.
Stimulus: Interframe time fill on the D-channel.
Monitor: D-channel at the monitor port of the network simulator.
Results: Binary ONEs.
6.1.2 D-echo channel response
Reference: ETS 300 012-1 [3], subclauses 7.1.3, 7.1.4 and 7.1.5.
Purpose: To check if the TE detects collisions on the D-channel when transmitting, by
means of the D-echo channel and ceases transmission immediately.
To check if the TE changes the priority level correctly within its priority class.
Rx
Tx
NETW ORK
SIMULATOR
AND
IUT
TEST
APPARATUS
Rx Tx
Figure 4: Test configuration
System state: Activated (state F7).
Stimulus: D-channel data from the terminal side corrupted and returned in the D-echo
channel.
Monitor: D-channel from the TE.
Results:
Result to test (a) "MISMATCH"
Ensure that when the TE receives a binary ONE instead of a binary ZERO (network error) or a binary
ZERO instead of a binary ONE (collision), the TE detects the mismatch and ceases transmission
immediately, i. e. the next D-bit received from the TE following the application of the stimulus is set to the
idle condition (binary ONE). This shall be ensured in each priority class and level which apply to the TE.

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ETS 300 012-4: October 1998
NOTE: The value of the subsequent bits is related to the priority class and priority level within
the class and is covered by tests (b) and (c).
The test shall be performed with binary ONE and binary ZERO.
Result to test (b) "PRIORITY CLASS"
Ensure that after receipt by the TE of an errored D-echo channel bit, the TE while at the normal priority
level receives at least 8 (for priority class 1) or at least 10 (for priority class 2), according to the priority
class of the layer 2 frame to be transmitted, contiguous D-echo channel bits set to binary ONE before
transmission recommences.
Result to test (c) "PRIORITY LEVEL"
Ensure that after successful transmission of a layer 2 frame, the TE does:
- not commence the transmission of a subsequent layer 2 frame until after the receipt of at least 9
(for priority class 1) or at least 11 (for priority class 2) contiguous D-echo channel bits set to binary
ONE;
- change back to normal priority level after the receipt of 9 (for priority class 1) or 11 (for priority class
2) contiguous D-echo channel bits set to binary ONE if no frame is available to be transmitted.
6.2 Activation/deactivation
Reference: ETS 300 012-1 [3], subclauses 7.2, 7.3, 7.4.
6.2.1 Activation/deactivation procedure
Reference: ETS 300 012-1 [3], subclauses 7.2, 7.2.1, 7.2.2, 7.2.3,7.2.4, 7.4.1, 7.4.2.
Purpose: To check the terminal correctly executes the activation/deactivation procedure.
Rx
Tx
NETW ORK
SIMULATOR
AND
IUT
TEST
APPARATUS
Rx Tx
Figure 5: Test configuration
System state: Any state.
Stimulus: Power source 1 connected and disconnected, line signals INFOs 0, 2, 4 and any
signal applied from the network and activation request (PH-AR) from the IUT.
Monitor: Line signals: INFOs 0, 1 and 3 at the network simulator.
Results: New state, transmitted signal (as described in table 2), and primitives sent to the
higher layers according to tables 5, 6 or 7 in ETS 300 012-1 [3].

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ETS 300 012-4: October 1998
Table 2: Stimuli and resulting state changes
STATE CURRENT STIMULUS NOTE NEXT INFO COMMENT
NO STATE STATE SENT
1 F1 Power 1 F2 INFO 0 Detection of power
2 F1 T3 expires 2, 6 F1 INFO 0 No action
3 F2 Loss of Power F1 INFO 0 Return to inactive state
4 F2 Rx INFO 0 4 F3 INFO 0 Assume deactivated state
5 F2 Rx INFO 2 F6 INFO 3 Synchronized state
6 F2 Rx INFO 4 F7 INFO 3 Activated
7 F2 Rx any signal 3 F2 INFO 0 No action
8 F2 T3 expires 6 F2 INFO 0 No action
9 F3 Loss of power 9 F1 INFO 0 Return to inactive
10 F3 PH-AR F4 INFO 1 Initiate activation and T3
11 F3 Rx INFO 0 4 F3 INFO 0 No action
12 F3 Rx INFO 2 F6 INFO 3 Synchronized state
13 F3 Rx INFO 4 F7 INFO 3 Activated
14 F3 Rx any signal 3 F3 INFO 0 No action
15 F3 T3 expires 2 F3 INFO 0 No action
16 F4 Loss of power 9 F1 INFO 0 Return to inactive state
17 F4 Rx INFO 0 4 F4 INFO 1 No action
18 F4 Rx INFO 2 7 F6 INFO 3 Synchronized
19 F4 Rx INFO 4 7 F7 INFO 3 Active
20 F4 Rx any signal 3 F5 INFO 0 Detection of signal
21 F4 T3 expires 2 F3 INFO 0 Deactivated
22 F5 Loss of power 9 F1 INFO 0 Return
...