ETSI TS 101 548-1 V2.4.1 (2020-05)

Access, Terminals, Transmission and Multiplexing (ATTM); European Requirements for Reverse Powering of Remote Access Equipment; Part 1: Twisted pair networks

RTS/ATTM-0636

General Information

• Status: Not Published
• Technical Committee: ATTM TM6 - Wireline Access Network Systems
• Current Stage: 12 - Completion
• Due Date: 26-May-2020
• Completion Date: 19-May-2020

Standards Content (Sample)

ETSI TS 101 548-1 V2.4.1 (2020-05)






TECHNICAL SPECIFICATION
Access, Terminals, Transmission and Multiplexing (ATTM);
European Requirements for Reverse Powering
of Remote Access Equipment;
Part 1: Twisted pair networks

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2 ETSI TS 101 548-1 V2.4.1 (2020-05)



Reference
RTS/ATTM-0636
Keywords
ADSL2plus, VDSL2

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3 ETSI TS 101 548-1 V2.4.1 (2020-05)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 9
3.3 Abbreviations . 9
4 Introduction to Reverse Power Feed . 11
5 Reverse Power Feed Architecture . 12
5.1 Basics of RPF . 12
5.2 Reverse Power Feed and POTS Co-Existence . 12
5.2.1 Overview . 12
5.2.2 POTS Adapters . 13
5.2.2.1 General . 13
5.2.2.2 POTS Adapter - E (POTSA-E) . 13
5.2.2.3 POTS Adapter - C (POTSA-C) . 13
5.2.2.4 POTS Adapter - D (POTSA-D) . 14
5.3 Reverse Power Feed Architecture without POTS on the same pair (RPFA-NOP). 14
5.4 Reverse Power Feed Architecture with Baseband POTS from the Exchange (RPFA-EXP). 15
5.5 Reverse Power Feed Architecture with Baseband POTS from the Exchange Sharing the in-premises

Wiring (RPFA-EXPSW) . 17
5.6 Reverse Power Feed Architecture with Derived POTS (RPFA-DRP) . 18
5.7 Reverse Power Feed Architecture with Derived POTS Sharing the in-premises Wiring (RPFA-DRPSW) . 19
5.8 Reverse Power Feed Architecture without POTS and with Broadband Bypass (RPFA-NOPBB) . 20
6 Reverse Power Feed Start-Up Protocol . 21
6.1 Introduction . 21
6.1.1 General . 21
6.1.2 Start-up in presence of MELT signature . 23
6.2 Metallic Detection based Start-Up (MDSU) Protocol . 24
6.2.1 Signature detection . 24
6.2.2 DPU classification using MDSU protocol . 27
6.2.3 Start-up Sequence diagram . 29
6.2.4 Start-up flow chart . 29
6.2.5 POTS RCR Protocol (PRP) - Optional extension of MDSU . 31
6.2.5.1 PRP definition . 31
6.2.5.2 PRP electrical specifications . 36
6.2.5.2.1 PSE electrical specification for PRP. 36
6.2.5.2.2 DPU electrical specification for PRP . 37
6.2.5.3 Interoperability between "PRP capable" and "non PRP capable devices" . 38
6.3 RPF Dying Gasp and Indication Primitives . 39
6.3.1 General . 39
6.3.2 DGL pulse sequence . 40
6.3.3 OHP pulse sequence . 41
6.3.4 BAT, BBA and ACM pulse sequences . 42
6.4 RPF Operations and Maintenance . 44
7 Reverse Power Feed Characteristics . 45
7.1 Safety Aspects . 45
ETSI

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4 ETSI TS 101 548-1 V2.4.1 (2020-05)
7.1.1 Background . 45
7.1.2 Unintended consequences . 45
7.2 RPF Range Options and Classes . 45
7.3 Electrical reference model and RPF Noise Limits . 47
7.4 Zero touch DPU . 49
7.5 PSE and DPU PE electrical specification . 52
7.5.1 PSE electrical specification. 52
7.5.1.1 PSE electrical specification on interface U-R2P . 52
7.5.1.2 PSE isolation requirements . 54
7.5.1.3 PSE Touch Current Limitation . 54
7.5.1.4 PSE Power Frequency Common mode immunity . 54
7.5.2 DPU electrical specification . 55
7.5.2.1 Reach Resistance definition . 55
7.5.2.2 DPU electrical specification at U-O interface . 56
7.5.3 DPU power modes . 57
7.6 Micro-interruption requirements . 58
7.6.1 PSE micro-interruption requirements . 58
7.6.2 DPU micro-interruption specification . 58
8 Power Splitter Characteristics . 58
8.1 General . 58
8.2 Power Splitter class definition . 59
8.3 Description of Power Splitter Use Cases . 60
8.3.1 General . 60
8.3.2 DPU - case 1: No POTS service sharing the loop wiring . 60
8.3.3 DPU - case 2: With POTS service from the exchange . 61
8.3.4 DPU - case 3: With a Derived POTS service sharing the wiring . 62
8.3.5 CPE - case 1: No POTS service sharing the loop wiring . 63
8.3.6 CPE - case 2: With POTS service from the exchange . 63
8.3.7 CPE - case 3: With a derived POTS service sharing the wiring . 64
8.4 Power Splitter Requirements . 65
8.4.1 General . 65
8.4.2 DSL Insertion Loss . 65
8.4.3 DSL Impedance Conversion . 66
8.4.4 DSL-Band Noise Attenuation . 67
8.4.5 DSL Port DC Isolation Resistance . 67
8.4.6 POTS Measurement Procedure . 67
8.4.7 POTS Insertion Loss . 68
8.4.8 POTS Impedance Conversion . 69
8.4.9 POTS-band longitudinal Balance . 70
8.4.10 POTS-band Noise Attenuation . 70
8.4.11 POTS DC Isolation Resistance . 70
8.4.12 Tolerance to DC Feed . 71
8.4.13 Tolerance to Ringing . 71
8.4.14 Power Drain . 72
9 POTS Adapter Characteristics . 73
9.1 Introduction . 73
9.2 Description of POTS Adapters Use Cases . 74
9.2.1 General . 74
9.2.2 DPU - case 1: No POTS service sharing the loop wiring . 74
9.2.3 DPU - case 2: With a POTS service from the exchange - Adapter-E . 74
9.2.4 DPU - case 3: With a derived POTS service sharing the wiring . 75
9.2.5 CPE - case 1: No POTS service sharing the loop wiring . 75
9.2.6 CPE - case 2: With a POTS service from the exchange - Adapter-C . 75
9.2.7 CPE - case 2: With a POTS service from the exchange - Adapter-D . 76
9.2.8 CPE - case 3: With derived POTS sharing the wiring - Adapter-D . 76
9.2.9 CPE - case 3: With derived POTS sharing the wiring - Adapter-E . 77
9.3 POTS Adapter Requirements . 78
9.3.1 General . 78
9.3.2 DSL Insertion Loss . 78
9.3.3 DSL Impedance Conversion . 78
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5 ETSI TS 101 548-1 V2.4.1 (2020-05)
9.3.4 DSL-band Noise Generation . 79
9.3.5 POTS Measurement Procedure . 79
9.3.6 POTS Insertion Loss . 81
9.3.7 POTS Impedance Conversion . 82
9.3.8 POTS-band longitudinal Balance . 83
9.3.9 Signalling Channel Noise . 84
9.3.10 POTS DC Isolation Resistance . 84
9.3.11 Ringing Detection . 85
9.3.12 Ringing Generation . 85
9.3.13 DC Feed Detection. 86
9.3.14 DC Feed Generation . 86
9.3.15 Hook Switch . 87
9.3.16 Hook State Detection . 87
9.3.17 Bypass Mode . 87
9.3.18 Power Drain . 88
Annex A (informative): Reverse power backup systems . 89
A.1 Case 1 battery backup in the CPE . 89
A.2 Case 2 battery backup in the DPU and CPE . 89
Annex B (normative): General POTS requirements . 90
Annex C (informative): RPF Noise Limits For Common Mode. 91
C.1 Introduction . 91
C.2 Derivation . 91
C.3 Cable Balance Model and Common Mode PSD Construction. 91
C.4 Example of Measurement Environment . 91
Annex D (informative): Out-of-Band Signalling Channel for POTS Adapters . 93
Annex E (normative): PRP PSE low level flow charts . 95
E.1 General . 95
E.2 Perform MDSU . 96
E.3 POTS RCR MDSU Error Handler . 97
E.4 PSE Reverse Power Active . 98
E.5 Perform POTS RCR . 99
E.6 Send PRP Trigger . 100
E.7 Set Initial State . 101
E.8 Send Enable Trigger to POTS Adapter . 102
Annex F (informative): Long Range RPF Classification . 103
Annex G (informative): Bibliography . 104
Annex H (informative): Change History . 105
History . 106

ETSI

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6 ETSI TS 101 548-1 V2.4.1 (2020-05)
Intellectual Property Rights
Essential patents
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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 (https://ipr.etsi.org/).
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.
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Access, Terminals, Transmission
and Multiplexing (ATTM).
The present document is part 1 of a multi-part deliverable covering the European requirements for reverse powering of
remote access equipment, as identified below:
Part 1: "Twisted pair networks";
Part 2: "Coaxial cable networks".
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
Introduction
As various Operators consider the deployment of fibre-fed remote nodes that contain xDSL DSLAM equipment, it is
necessary to consider the means of powering such remotely located equipment. One such method, known as "reverse
power feed", transmits the power from the customer premises to the fibre-fed remote node using the distribution-side
copper network. The present document defines a reverse power feed transmission standard which allows Operators to
source suitably compliant equipment for inclusion in their networks. The reverse power feed methodology can be used
to power a remote node hosting any metallic transmission system (e.g. G.fast [i.4], VDSL2 [i.3], etc.).
ETSI

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7 ETSI TS 101 548-1 V2.4.1 (2020-05)
1 Scope
The present document defines architectures and specifications for reverse powering of remote network nodes from one
or multiple CPEs over twisted pair networks. The architectures describe how to combine reverse power feed with the
data only, VoIP and POTS line services. Start-up protocols are defined to ensure proper interaction between the line
services and the reverse power system. Operations and maintenance requirements for managing the reverse power feed
and power combining within the remote network node are specified. The present document also identifies power splitter
and POTS Adapter requirements.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference/.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI ES 202 971: "Access and Terminals (AT); Public Switched Tele
...