ETSI ETS 300 012 ed.1 (1992-04)

SLOVENSKI STANDARD
01-december-2003
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Integrated Services Digital Network (ISDN); Basic user-network interface; Layer 1
specification and test principles
Ta slovenski standard je istoveten z: ETS 300 012 Edition 1
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
TELECOMMUNICATION April 1992
STANDARD
Source: ETSI TC-TM Reference: DE/TM-3009
ICS: 33.040, 33.040.50, 33.080
ISDN, user network interface, testing
Key words:
Integrated Services Digital Network (ISDN);
Basic user-network interface
Layer 1 specification and test principles
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 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 1992. All rights reserved.
New presentation - see History box

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ETS 300 012: April 1992
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 Standards Approval Dept." at the address shown on the title page.

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ETS 300 012: April 1992
Contents
Foreword.9
1 Scope . 11
2 Normative references . 11
3 Definitions. 12
4 Abbreviations and symbols. 14
5 Conformance . 15
6 Requirements. 16
7 Additional requirements. 16
7.1 Limitations on power source and sink during transient conditions. 16
7.1.1 Current/time limitations for TEs. 16
7.1.2 Power source switch-over. 17
7.1.2.1 Power source switch-over time. 17
7.1.2.2 Restricted mode power source requirements under
overload conditions . 17
7.1.3 Other TE requirements . 18
7.1.3.1 Minimum TE start up current. 18
7.1.3.2 Protection against short term interruptions. 18
7.1.3.3 Behaviour at the switch-over. 19
7.1.4 Other power source requirements . 19
7.1.4.1 Power source 1 restricted. 19
7.1.4.2 Power source 1 normal. 19
7.1.4.3 Requirements for type (a) sources. 19
7.1.4.4 Requirements for both types of sources . 19
7.1.4.4.1 Switch-on surge capability. 19
7.1.4.4.2 TE connection surge capability . 20
7.2 Current unbalance. 20
7.2.1 Direct current unbalance . 20
7.2.1.1 DC unbalance of PS1. 20
7.2.1.2 DC unbalance of power sink 1 . 20
7.2.1.3 Differential resistance in a pair of the installation wiring. 21
7.2.2 Current unbalance in a pair. 21
7.3 Additional requirements for an Auxiliary Power Supply (APS). 21
7.3.1 Power available for an APS. 21
7.3.2 APS switch-on time . 22
7.3.3 APS switch-off time. 22
7.3.4 APS power consumption when off . 22
7.3.5 Dynamic behaviour of APS. 22
7.4 Additional requirements for NT1 restricted mode source for compatibility with an APS. 22
7.4.1 PS1 restricted mode back-off. 22
7.4.2 PS1 restricted mode power-up. 23
7.4.3 NT1 power consumption from APS normal mode . 23
Annex A (normative): Statements, modifications and additional requirements to CCITT
Recommendation I.430 [2]. 24
Annex B (normative): Additional requirements applicable to the (explicit) S reference point. 39

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ETS 300 012: April 1992
B.1 Introduction.39
B.2 References.39
B.3 Definitions. 39
B.3.1 Private Network Termination (PNT).39
B.3.2 Terminal Equipment (TE) .39
B.4 Conformance .39
B.5 Requirements.39
B.6 Provision of power.39
Annex C (informative): TE design to minimise power disturbance.40
Annex D (normative): Conformance test principles to Interface Point I .42
a
D.1 Scope and general information . 42
D.1.1 Scope .42
D.1.2 General information.43
D.1.3 Definitions and abbreviations.43
D.1.4 Allocation of tests.43
D.1.4.1 General . 43
D.1.4.2 Service characteristics. 43
D.1.4.3 Modes of operation .44
D.1.4.4 Wiring .44
D.1.4.5 Functional characteristics.44
D.1.4.6 Interface procedures .45
D.1.4.7 Maintenance .45
D.1.4.8 Electrical characteristics .46
D.1.4.9 Power feeding. 47
D.1.4.10 Interface connector and contact assignments.48
D.1.4.11 Annexes .48
D.2 Functional characteristic tests (Clause A.5, ETS 300 012).49
D.2.1 Binary organisation of frame.49
D.2.1.1 Test A (subclauses A.5.4.2.1, A.5.5, A.5.6, ETS 300 012) .49
D.2.1.2 Test B (subclause A.6.2.2, ETS 300 012) .51
D.3 Interface procedure tests (Clause A.6, ETS 300 012) .52
D.3.1 D-channel access control procedure (subclause A.6.1, ETS 300 012) .52
D.3.1.1 Interframe (layer 2) time fill (subclause A.6.1.1, ETS 300 012) .52
D.3.1.2 D-echo channel response (subclauses A.6.1.3 to A.6.1.6, ETS 300 012).53
D.3.2 Activation/deactivation (subclause A.6.2, ETS 300 012) .54
D.3.2.1 Activation/deactivation procedure (subclause A.6.2, ETS 300 012).54
D.3.2.2 Timer for activation/deactivation (subclause A.6.2, ETS 300 012).56
D.3.2.2.1 Timer for activation when receiving INFO 2.56
D.3.2.2.1.1 Test A, in state F3 (subclause
A.6.2.6.1, ETS 300 012).56
D.3.2.2.1.2 Test B, in state F4 (subclause
A.6.2.6.1, ETS 300 012).56
D.3.2.2.2 Timer for activation when receiving INFO 4 (subclause
A.6.2, ETS 300 012).57
D.3.2.2.2.1 Test A, in state F3 (subclause
A.6.2.6.1, ETS 300 012).57
D.3.2.2.2.2 Test B, in state F4
(subclause A.6.2.6.1, ETS 300 012) .57

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ETS 300 012: April 1992
D.3.2.2.3 Timer for activation when receiving any signal (subclause
A.6.2.6.1, ETS 300 012) . 58
D.3.2.2.4 Value of the timer T3 (subclause A.6.2.5, ETS 300 012). 58
D.3.2.2.5 Timer for physical deactivation. 59
D.3.2.2.5.1 Test A, in state F6 (subclause A.6.2.7,
ETS 300 012) . 59
D.3.2.2.5.2 Test B, in state F7 (subclause A.6.2.7,
ETS 300 012) . 59
D.3.2.2.6 Timer for complete deactivation . 60
D.3.2.2.6.1 Test A, in state F7 (subclause
A.6.2.3.2, ETS 300 012, NOTE 6). 60
D.3.2.2.6.2 Test B, in state F8 (subclause
A.6.2.3.2, ETS 300 012, NOTE 6). 61
D.3.3 Frame alignment procedures (subclause A.6.3, ETS 300 012). 62
D.3.4 Multiframing procedures (subclause A.6.3.3, ETS 300 012). 63
D.3.5 Idle channel code on the B-channels (subclause A.6.4, ETS 300 012). 63
D.4 Electrical characteristics tests (Clause A.8, ETS 300 012) . 64
D.4.1 Frame rate when transmitting an INFO 1 (subclause A.8.1, ETS 300 012). 64
D.4.2 TE jitter characteristics (subclause A.8.2, ETS 300 012). 65
D.4.2.2 TE output phase deviation (test B) (subclause A.8.2.3, ETS 300 012) . 67
D.4.3 TE transmitter output impedance (subclause A.8.5.1.2, ETS 300 012) . 69
D.4.3.1 Test A . 69
D.4.3.2 Test B . 70
D.4.3.3 Test C. 71
D.4.3.4 Test D. 71
D.4.3.5 Test E . 72
D.4.4 Pulse shape and amplitude (subclause A.8.5.3, ETS 300 012). 73
D.4.5 Pulse unbalance (subclause A.8.5.4, ETS 300 012). 74
D.4.5.1 Pulse amplitude (subclause A.8.5.4.1, ETS 300 012) . 74
D.4.5.2 Pulse unbalance of an isolated couple of pulses (subclause A.8.5.4.2, ETS
300 012). 75
D.4.6 Voltage on other test loads (subclause A.8.5.5, ETS 300 012) . 76
D.4.6.1 Test A (subclause A.8.5.5.1, ETS 300 012) . 76
D.4.6.2 Test B (subclause A.8.5.5.2, ETS 300 012) . 77
D.4.7 Longitudinal conversion loss of transmitter output (subclause A.8.5.6.1, ETS 300 012). 78
D.4.8 Receiver input characteristics (subclause A.8.6, ETS 300 012). 79
D.4.8.1 TE receiver input impedance (subclause A.8.6.1.1, ETS 300 012). 79
D.4.8.1.1 Test A . 79
D.4.8.1.2 Test B . 80
D.4.8.1.3 Test C . 81
D.4.8.1.4 Test D . 82
D.4.8.2 Receiver sensitivity - noise and distortion immunity (subclause A.8.6.2,
ETS 300 012) . 83
D.4.8.3 Unbalance about earth of receiver input (subclause A.8.6.4, ETS 300 012). 84
D.5 Power feeding (subclause A.9, ETS 300 012) . 85
D.5.1 Power source 1 phantom mode (subclause A.9.3.1, ETS 300 012). 86
D.5.1.1 Normal power conditions (subclause A.9.3.1.1, ETS 300 012). 86
D.5.1.1.1 Normal power provision (Test A). 86
D.5.1.1.2 Normal power provision (Test B). 87
D.5.1.1.3 Normal power provision (Test C). 88
D.5.1.1.4 Normal power provision (Test D). 89
D.5.1.1.5 Normal power provision (Test E). 90
D.5.1.2 Restricted power conditions (subclause A.9.3.1.2, ETS 300 012) . 91
D.5.1.2.1 Restricted power provision (Test A). 91
D.5.1.2.2 Restricted power provision (Test B). 92
D.5.1.2.3 Restricted power provision (Test C). 93
D.5.1.2.4 Restricted power provision (Test D). 94
D.5.1.2.5 Restricted power provision (Test E). 95

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ETS 300 012: April 1992
D.5.1.2.6 Restricted power provision (Test F) . 96
D.5.1.3 Current transient (subclause A.9.4, ETS 300 012).97
D.5.1.4 Limitation on power sink during transient conditions (subclause 7.1, ETS
300 012).98
D.5.1.4.1 Current/time limitation for TE (subclause 7.1.1, ETS 300
012).98
D.5.1.4.2 Current/time limitation for TE when connecting
(subclause 7.1.1, ETS 300 012). 100
D.5.1.4.3 Behaviour of a TE using a connection detector
(subclause 7.1.1, ETS 300 012). 101
D.5.1.4.4 Power start-up test (subclause 7.1.3.1, ETS 300 012) . 102
D.5.1.4.4.1 Power start-up test after removal of
short-circuit (subclause 7.1.3.1, ETS
300 012). 102
D.5.1.4.4.2 Power start-up test at low input
voltage (subclause 7.1.3.1, ETS 300
012) . 103
D.5.1.4.5 Protection against short-term interruptions
(subclause 7.1.3.2, ETS 300 012). 104
D.5.1.4.5.1 Normal power . 104
D.5.1.4.5.2 Restricted power. 105
D.5.1.4.6 Behaviour at the switch-over (subclause 7.1.3.3-ETS 300
012). 106
D.5.1.4.6.1 Normal power . 106
D.5.1.4.6.2 Restricted power (subclause 7.1.3.3,
ETS 300 012) . 107
D.5.1.4.7 DC unbalance of TEs using power sink 1
(subclause 7.2.1.2, ETS 300 012). 108
D.5.1.4.8 Effect of current unbalance (subclause 7.2.2, ETS 300
012). 109
D.5.2 Power Source 2 - Optional third pair (subclause A.9.3.2, ETS 300 012) . 111
Annex E (normative): Conformance test principles to interface point I . 112
b
E.1 Scope and general information . 112
E.1.1 Scope . 112
E.1.2 General information. 112
E.1.3 Definitions and abbreviations. 113
E.1.4 Allocation of tests. 114
E.1.4.1 General . 114
E.1.4.2 Service characteristics. 114
E.1.4.3 Modes of operation . 114
E.1.4.4 Wiring. 114
E.1.4.5 Functional characteristics. 115
E.1.4.6 Interface procedures . 116
E.1.4.7 Maintenance . 116
E.1.4.8 Electrical characteristics . 117
E.1.4.9 Power feeding. 118
E.1.4.10 Interface connector and contact assignments . 119
E.1.4.11 Annexes. 119
E.2 Functional characteristic tests (Clause A.5, ETS 300 012). 120
E.2.1 Binary organisation of frame (subclause A.5.4.2.2, ETS 300 012). 120
E.2.1.1 Test A . 120
E.2.1.2 Test B . 122
E.3 Interface procedure tests (Clause A.6, ETS 300 012) . 123
E.3.1 D-channel Interframe Time Fill (subclause A.6.1.1, ETS 300 012). 123
E.3.2 D-echo channel response (subclause A.6.1.2, ETS 300 012). 123
E.3.3 Activation/deactivation (subclause A.6.2, ETS 300 012) . 124

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ETS 300 012: April 1992
E.3.3.1 Activation/Deactivation Procedure (subclause A.6.2, ETS 300 012). 124
E.3.3.2 Activation/deactivation time (subclause A.6.2, ETS 300 012) . 126
E.3.3.2.1 NT activation time (subclause A.6.2.6.2, ETS 300 012) . 126
E.3.3.2.2 Deactivation time (subclause A.6.2.7, ETS 300 012) . 128
E.3.3.2.3 Value of the timer T2 (subclause A.6.2.6.2, ETS 300
012) . 128
E.3.4 Frame alignment procedures (subclause A.6.3, ETS 300 012). 129
E.4 Electrical characteristic tests (Clause A.8, ETS 300 012) . 130
E.4.1 Bit rate (subclause A.8.1, ETS 300 012). 130
E.4.1.1 Bit rate when transmitting an INFO 2 (subclause A.8.1.1 and A.8.1.2, ETS
300 012). 130
E.4.1.2 Bit rate when transmitting an INFO 4 (subclause A.8.1.1 and A.8.1.2, ETS
300 012). 131
E.4.2 NT jitter characteristics (subclause A.8.3, ETS 300 012). 132
E.4.3 NT transmitter output impedance (subclause A.8.5.1.1, ETS 300 012) . 133
E.4.3.1 Test A. 133
E.4.3.2 Test B. 134
E.4.4 Pulse shape and amplitude (subclause A.8.5.3, ETS 300 012). 135
E.4.5 Pulse unbalance (subclause A.8.5.4, ETS 300 012). 136
E.4.5.1 Pulse amplitude (subclause A.8.5.4.1, ETS 300 012) . 136
E.4.5.2 Pulse unbalance of an isolated couple of pulses (subclause A.8.5.4.2, ETS
300 012). 137
E.4.6 Longitudinal conversion loss of transmitter output (subclause A.8.5.6.1, ETS 300 012). 138
E.4.7 Receiver input characteristics (subclause A.8.6, ETS 300 012). 139
E.4.7.1 NT receiver input impedance (subclause A.8.6.1.2, ETS 300 012). 139
E.4.7.1.1 Test A . 139
E.4.7.1.2 Test B . 140
E.4.7.2 Receiver sensitivity - Noise and distortion immunity (subclause A.8.6.2,
ETS 300 012) . 141
E.4.7.3 NT receiver input delay characteristics (subclause A.8.6.3, ETS 300 012) 142
E.4.7.4 Unbalance about earth of the receiver input (subclause A.8.6.4, ETS 300
012). 143
E.5 Power feeding (Clause A.9, ETS 300 012). 144
E.5.1 Power source 1 . 144
E.5.1.1 Normal power condition (subclause A.9.2.2.1, ETS 300 012). 144
E.5.1.2 Restricted power condition (subclause A.9.2.2.2, ETS 300 012) . 145
E.5.1.3 Power source switch-over time (subclause 7.1.2.1, ETS 300 012) . 146
E.5.1.4 Power source 1 restricted mode under overload conditions
(subclause 7.1.2.2, ETS 300 012) . 147
E.5.1.4.1 Test A (subclause 7.1.2.2, ETS 300 012). 147
E.5.1.4.2 Test B (subclause 7.1.2.2, ETS 300 012). 148
E.5.1.4.3 Power source 1 restricted (Test C) (subclause 7.1.2.2,
ETS 300 012). 149
E.5.1.4.4 Power source 1 restricted (Test D) (subclause 7.1.4.1,
ETS 300 012). 150
E.5.1.5 Requirements for type "a" sources (subclause 7.1.4.3, ETS 300 012). 151
E.5.1.6 Switch on surge capability (subclause 7.1.4.4.1, ETS 300 012) . 152
E.5.1.7 TE connection surge capability (subclause 7.1.4.4.2, ETS 300 012). 153
E.5.1.8 DC unbalance of power source 1 (subclause 7.2.1.1, ETS 300 012) . 154
E.5.1.9 Current unbalance in a pair (subclause 7.2.2, ETS 300 012). 155
E.5.2 Minimum voltage of power source 2 (subclause A.9.2.3, ETS 300 012). 156
E.6 Auxiliary power supply . 157
E.6.1 Additional requirements from an APS (subclause 7.3, ETS 300 012). 157
E.6.1.1 APS switch-on time (subclause 7.3.2, ETS 300 012). 158
E.6.1.2 APS switch-off time (subclause 7.3.3, ETS 300 012) . 159
E.6.1.3 APS requirements for type "a" sources (subclause 7.1.4.3, ETS 300 012) 160
E.6.1.4 APS switch on surge capability (subclause 7.1.4.4.1, ETS 300 012) . 161

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ETS 300 012: April 1992
E.6.1.5 APS TE connection surge capability (subclause 7.1.4.4.2, ETS 300 012). 162
E.6.1.6 APS current unbalance in a pair (subclause 7.2.2, ETS 300 012) . 163
E.6.2 Additional requirements for NT compatible with APS (subclause 7.4, ETS 300 012) . 164
E.6.2.1 Power source 1 mode back-off (subclause 7.4.1, ETS 300 012). 164
E.6.2.2 Power source 1 restricted mode power-up (subclause 7.4.2, ETS 300
012) . 165
E.6.2.3 Power consumption from APS normal mode (subclause 7.4.3, ETS 300
012) . 166
History . 167

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ETS 300 012: April 1992
Foreword
This European Telecommunication Standard (ETS) was produced by the Transmission and Multiplexing
(TM) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS aims to meet urgent requirements of network operators and equipment manufacturers who are
designing equipment to operate with an Integrated Services Digital Network (ISDN) basic rate access
user-network interface. This ETS shall replace CEPT Recommendation T/L 03-07 (November 1987).
This ETS takes into account the special requirements from ECMA Standard 103: "Physical layer at the
basic access interface between data processing equipment and private switching networks" (1987, 2nd
Edition) in Annex B.
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ETS 300 012: April 1992
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ETS 300 012: April 1992
1 Scope
This European Telecommunication Standard (ETS) specifies requirements and test principles for the ISDN
basic rate user-network interface including the physical, electrical and functional characteristics and the
information exchange with higher layers. This ensures that interface implementations in an ISDN equipment
for use with ISDN basic access is portable within Europe with regard to layer 1 interface aspects and that
interworking with higher layer protocols for ISDN is supported.
This ETS is applicable to equipment having interface I or I for the connection to the ISDN basic access
a b
intended to be installed on customers premises. According to CCITT Recommendation I.411 [1], this ETS
is to be applied to interfaces at reference points S, T and S/T (coincident S and T) of the ISDN reference
configuration.
For the case where this ETS is applied to the T and the S/T reference point, the main body of this text
and Annexes A, D and E are normative.
For the case where this ETS is applied to the S reference point, the main body of this text and Annexes A,
B, D and E are normative.
This ETS is based on CCITT Recommendation I.430 [2] and gives further requirements or modifications to
this base document. Furthermore, this ETS identifies for each aspect defined in CCITT Recommendation
I.430 [2] whether it is regarded as normative or informative in the sense of this ETS.
Annexes D and E to this ETS specify the relevant test principles to verify the requirements and for testing
conformance to this ETS. It is outside the scope of this ETS to define the static conformance requirements
an equipment has to meet for approval attachment to a public network.
This ETS does not specify:
- safety requirements;
- interface or equipment overvoltage protection requirements;
- immunity requirements against electromagnetic interferences;
- emission limitation requirements.
2 Normative references
This European Telecommunication Standard 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 European Telecommunication Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to applies.
[1] CCITT Recommendation I.411, (1988): "ISDN user-network interfaces -
reference configurations".
[2] CCITT Recommendation I.430, (1988): "Basic user-network interface - layer 1
specification".
[3] ETS 300 125 (1991): "Integrated Services Digital Network (ISDN); User-network
interface data link layer specification, Application of CCITT Recommendations
Q.920/I.440 and Q.921/I.441".
[4] prEN 28 877: "Interface connector and contact assignments for ISDN basic
access interface located at reference points S and T".
[5] ENV 41 001: "ISDN connector up to 8 pins and up to 2,048 Mbit/s".

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ETS 300 012: April 1992
[6] prEN 50096: "Integrated Services Digital Network (ISDN); Equipment with ISDN
user-network interface at basic and primary rate - EMC requirements".
[7] Final draft prETS 300 047: "Integrated Services Digital Network (ISDN); Basic
Access - safety and protection".
[8] CEN/CENELEC ENV 41 004: "Reference Configuration for Calls, based on ISDN
Connection Types, as provided by Private Telecommunication Network
Exchange".
[9] CCITT Recommendation X.200 (1988): "Reference model of open systems
interconnection for CCITT applications".
[10] CCITT Recommendation I.431 (1988): "Primary rate user-network interface -
Layer 1 specification".
[11] CCITT Recommendation G.960 (1988): "Digital section for ISDN basic rate
access".
[12] CCITT Recommendation G.961 (1988): "Digital transmission system on metallic
local lines for ISDN basic rate access".
[13] ETS 300 102-1 (1990): "Integrated Services Digital Network (ISDN); User-
network interface layer 3; Specifications for basic call control".
[14] CCITT Recommendation O.171 (1988): "Timing jitter measuring equipment for
digital systems".
[15] CCITT Recommendation Q.512 (1988): "Exchange interfaces for subscriber
access".
[16] CCITT Recommendation G.812 (1989): "Timing requirements at the outputs of
slave clocks suitable for plesiochronous operation of international digital links".
3 Definitions
For the purposes of this ETS the following definitions, together with those given in Annex E of CCITT
Recommendation I.430 [2] and in CCITT Recommendation I.411 [1] apply.
Terminal equipment (TE): an equipment with interface I and consisting of one or more functional blocks.
a
NOTE: 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.
Network termination (NT): an equipment providing interface I .
b
NOTE: 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
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ETS 300 012: April 1992
Network termination type 1 (NT1): this functional group includes functions broadly equivalent to layer 1
(physical) of the 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.
Network termination type 2 (NT2): this functional group includes functions broadly equivalent to layer 1
and higher layers of the CCITT Recommendation X.200 [9] reference model. PABXs, local area networks,
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.
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 CCITT
Recommendation I.411 [1]).
Power source 1 (PS1): power source for the provision of remote power feeding of TE from NT via a
phantom circuit of the interface wires.
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
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ETS 300 012: April 1992
4 Abbreviations and symbols
For the purpose of this ETS the following abbreviations apply.
APS: Auxiliary Power Source
C: Capacitance
CCITT: International Telegraph and Telephone Consultative Committee
DC: Direct Current
ECMA: European Computer Manufacturers' Association
EMC: ElectroMagnetic Compatibility
ETS: European Telecommunication Standard
ETSI: European Telecommunications Standards Institute
I: current
I : Interface point a
a
I : Interface point b
b
ISDN: Integrated Services Digital Network
L: inductance
NT: Network Termination
PABX: Private Automatic Branch Exchange
PS: Power Source / power Sink
R: Resistor
TA: Terminal Adaptor
TE: TErminal
TM: ETSI Transmission and Multiplexing Technical Committee
V: Voltage.
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ETS 300 012: April 1992
5 Conformance
Conformance to this ETS implies that the requirements in normative Clauses/subclauses of this ETS are
met when tested according to the test principles given in Annexes D and E, with the exception that the
items given in table 1 are optional.
Table 1: Implementation options
�˜˜˜˜˜˜˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡Clause/ ‡ Option                       ‡
‡subclause‡                          ‡
ˆ˜˜˜˜˜˜˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡7.1.4.2 ‡ Power source characteristic a) or b)        ‡
‡     ‡                          ‡
‡7.1.4.4.2‡ Maximum number of terminals to be fed from power  ‡
‡     ‡ source 1                      ‡
‡     ‡                          ‡
‡7.3.1  ‡ Maximum number of terminals to be fed from APS,  ‡
‡     ‡ loading factor of APS               ‡
‡     ‡                          ‡
‡7.4   ‡ NT1 designed to be compatible with an APS: yes, no ‡
‡     ‡                          ‡
‡7.4.1  ‡ NT1 normal mode voltage detector: yes, no     ‡
‡     ‡                          ‡
‡A.4.4  ‡ Connection of NT to user premises wiring      ‡
‡     ‡                          ‡
‡A.4.5  ‡ -Connection of the connecting cord to equipment  ‡
‡     ‡ -Location of the terminating resistor at the NT  ‡
‡     ‡ side                       ‡
‡     ‡ -Connecting cord is part of TE, or TE is designed ‡
‡     ‡ for use with "standard ISDN basic access TE cord" ‡
‡     ‡                          ‡
‡A.5.3.2 ‡ -Connected/disconnected indication: a) or b)    ‡
‡     ‡                          ‡
‡A.6.1.4 ‡ Priority class: fixed or under control of layer 2 ‡
‡     ‡                          ‡
‡A.6.2.2 ‡ TE not able to initiate activation: yes, no    ‡
‡     ‡                          ‡
‡A.6.2.3.2‡ Activation/deactivation procedure according to   ‡
‡     ‡ table 5, table C-1 or table C-2/I.430 [2]:    ‡
‡     ‡ -TE powered from power source 1 or 2,       ‡
‡     ‡ -TE locally powered and unable to detect PS 1 or 2,‡
‡     ‡ -TE locally powered and able to detect PS 1 or 2  ‡
‡     ‡                          ‡
‡A.6.2.4.1‡ Timer T2 in NT = 25 ms to 100 ms or T2 = 0     ‡
‡(Table 6)‡                          ‡
‡     ‡                          ‡
‡A.6.3.3 ‡ TE supporting multiframing: yes, no.        ‡
‡     ‡ NT2 providing multiframing: yes, no.        ‡
‡     ‡                          ‡
‡A.8.6.2 ‡ NT designed for configurations according 8.6.2.2, ‡
‡     ‡ 8.6.2.3, 8.6.2.4 or 8.6.2.5            ‡
‡     ‡                          ‡
‡A.8.6.3 ‡ NT designed for round trip delay according 8.6.3.1,‡
‡     ‡ 8.6.3.2, 8.6.3.3 or 8.6.3.4            ‡
‡     ‡                          ‡
‡A.8.9  ‡ Standard cord length: a) < 7 m  or b) 7 m to 10 m ‡
‡     ‡                          ‡
‡A.9.1.2 ‡ -Provision of power source 1 (normal):       ‡
‡     ‡ integral part of NT or physically separated (APS) ‡
‡     ‡ -Provision of power source 2: yes, no       ‡
‡     ‡ -Provision of power sink 1: yes, no        ‡
‡     ‡ -Provision of power sink 2: yes, no        ‡
‡     ‡                          ‡
‡A.9.2.1 ‡ Power available from power source 1        ‡
‡     ‡                          ‡
‡A.9.5.2.1‡ TE designed for restricted power operation: yes, no‡
‡     ‡                          ‡
‡Annex C ‡ TE designed to minimise power disturbance: yes, no ‡
�˜˜˜˜˜˜˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�

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ETS 300 012: April 1992
6 Requirements
The requirements in this ETS are given in CCITT Recommendation I.430 [2] together with the statements,
modifications and additional requirements as defined in Annex A.
References in CCITT Recommendation I.430 [2] to CCITT Recommendations I.440 or I.441 Annex F
candidates shall be read as to ETS 300 125 [3].
7 Additional requirements
The following requirements for dynamic power feeding characteristics are additional to those given in
CCITT Recommendation I.430 [2]. They are currently under consideration in CCITT for inclusion into
Recommendation I.430 [2].
7.1 Limitations on power source and sink during transient conditions
7.1.1 Current/time limitations for TEs
To limit the current that each terminal can sink from the phantom circuit when connected to PS1 in
the normal condition, or when PS1 changes from restricted to normal condition, the terminal shall conform
to the mask given in figure 2, with the values given in the table 2, when tested in accordance with figure 1
(for TEs designed to minimise power disturbance see also Annex C).
Table 2: Parameters for the normal condition
�˜˜˜´˜˜˜˜˜˜´˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡ A ‡ 5 �s‡ Y ‡55 mA            ‡
ˆ˜˜˜¯˜˜˜˜˜˜¯˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  ‡   ‡  ‡current equivalent to 1 Watt‡
‡ C ‡100 ms‡ X ‡never exceeding 55 mA inde- ‡
‡  ‡   ‡  ‡pendent of the input voltage‡
�˜˜˜`˜˜˜˜˜˜`˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
To limit the current that a designated terminal can sink from the phantom when connected to PS1 in the
restricted condition, a designated terminal shall conform to the mask given in figure 2, with the values given
in table 3, when tested in accordance with figure 1.
Table 3: Parameters for the restricted condition
�˜˜˜´˜˜˜˜˜˜´˜˜˜´˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¿
‡ A ‡ 5 �s‡ Y ‡55 mA            ‡
ˆ˜˜˜¯˜˜˜˜˜˜¯˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜·
‡  ‡   ‡  ‡current equivalent to 380 mW‡
‡ C ‡100 ms‡ X ‡never exceeding 55 mA inde- ‡
‡  ‡   ‡  ‡pendent of the input voltage‡
�˜˜˜`˜˜˜˜˜˜`˜˜˜`˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜�
To limit the current that a non-designated terminal can sink from the phantom when connected to PS1 in
the restricted condition a non-designated terminal shall conform to the values given below, when tested
in accordance with figure 1.
The power consumption for TEs with connection detector when measured 100 μs after closing the switch
shall be ≤ 3 mW.
These TEs shall not assume disconnection (transition from any of the states F2 to F8 to state F1) until the
voltage of the interface has remained below 24 V for at least 500 ms.
The current consumption for TEs without connection detector when measured 100 μs after closing the
switch shall be ≤ 10 μA.
Page 17
ETS 300 012: April 1992
NOTE: The total effective capacitance at the PS1 input to the TE is expected to be less than
100 μF under all conditions of normal operation, startup and switch-over between
normal an
...