ETSI TS 102 973 V1.1.1 (2008-09)

Technical Specification
Access Terminals, Transmission and Multiplexing (ATTM);
Network Termination (NT)
in Next Generation Network architectures

2 ETSI TS 102 973 V1.1.1 (2008-09)

Reference
DTS/ATTM-02004
Keywords
access, network
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ETSI
3 ETSI TS 102 973 V1.1.1 (2008-09)
Contents
Intellectual Property Rights.4
Foreword.4
Introduction .4
1 Scope.8
2 References.8
2.1 Normative references.8
2.2 Informative references.9
3 Abbreviations.10
4 General requirements .11
4.1 Hardware and case characteristics.11
4.2 Powering characteristic.12
4.3 Electrical and Mechanical Protection, Safety, EMC and Environmental Safety (Eco-Compatibility).13
5 WAN physical interfaces.14
5.1 xDSL physical connector .14
5.2 ADSL2+ specific characteristics .14
5.3 VDSL2-only specific characteristics.15
5.4 VDSL2 and ADSL2+ specific characteristics .16
5.5 GPON-specific characteristics.16
5.6 Point-to-point FTTH specific characteristics .17
6 WAN interfaces logical framing .18
6.1 L2 ATM features.18
6.2 L2 Ethernet features .18
6.3 Performances.19
7 LAN interfaces.19
7.1 Single LAN port.19
7.2 Multiple LAN ports.19
8 IP functionalities .20
8.1 IP traffic generated inside the NT for communication with the network .20
8.2 IP traffic between LAN and WAN.20
9 LAN-WAN QoS functionalities.21
10 Security.22
11 Management.22
11.1 Remote physical layer monitoring capabilities.22
11.2 Local management and configuration .23
11.3 TCP/IP based remote management.24
11.4 Alternative management solution for Point-to-Point FTTH.25
11.5 Remote management in optical networks (GPON) .26
11.6 Physical alarms.26
12 Memory requirements related to firmware upgrade feature.27
13 Factory default configuration .27
Annex A (informative): Bibliography.28
History .29

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4 ETSI TS 102 973 V1.1.1 (2008-09)
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://webapp.etsi.org/IPR/home.asp).
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 Technical Specification (TS) has been produced by ETSI Technical Committee Access, Terminals, Transmission
and Multiplexing (ATTM).
Introduction
The present document defines the requirements of a Network Termination (NT) device for Next Generation Access
Networks in different technologies.
Because many options for such a device are feasible, depending on the access network technology, the business
scenario, the regulatory constraints, etc., the present document provides a superset of the requirements for a Layer 2
Network Termination: a specific NT device implementation may be derived by selecting the appropriate subset of
technical requirements.
The present document is organized as list of possible clauses for a joint specification to be used as Request for
Information and to extract contributions to be submitted to different Fora and Standardization bodies.
Business Rationale
As the next step in the evolution of Access Networks, it is foreseen that higher bandwidth services will be delivered,
either with active network elements built closer to the end-user (e.g. VDSL or Point-to-Point FTTH technology), or at
the opposite end with active elements more distant from the end-user (e.g. GPON FTTH technology). Due to the
deployment of new access networks, network operators are faced with technological, operational, financial and also
regulatory challenges.
The development of a Layer-2 Network Termination (NT) device at the customer premises location for Next
Generations Networks is related with the deployment of new very high broadband network access infrastructure and the
need to ensure a competitive market for retail services. Since the investment for those deployments is very high, it is
expected that only a very limited number of operators can build the infrastructure.
For this reason, in deployment scenarios where the investment in (part of) the infrastructure has geographically only
been made by a single Access Network Provider (ANP), a wholesale offer like "Ethernet Bitstream" will contribute to
create a competitive market for retail services. This will allow more Service Providers to offer services to end users
through a standard and unique Access Network-Home Network interface (Ethernet interface). The Ethernet Bitstream
offering can be considered as a Layer-2 transport service from the end-user location to the Point of Presence (PoP) of
the Broadband Service Provider (BSP), as an alternative to sub-loop unbundling. Then the BSP supplies the end user IP
connectivity and optionally application services of its own or of other application service providers (ASP). At the
contrary, in deployment scenarios where several companies have invested in broadband network access infrastructure in
a given geographical area, retail services competition is provided by sub-loop unbundling and therefore wholesale offer
like "Ethernet Bitstream" is not required.
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5 ETSI TS 102 973 V1.1.1 (2008-09)
The following scenarios can be considered:
1) Multiple access network providers in a given area/Single network operator per customer: each access
network is owned by an operator offering its own bundle of services; the customer can churn from one
operator to another.
In this scenario the NT is not strictly mandatory as a stand-alone device. The operator can provide an
integrated CPE device (Home Gateway) to its customer in order to terminate the xDSL or fiber optic link and
to deliver its services.
2) Single access network provider in a given area/Multiple BSP per customer: this scenario refers to a single
open access network, owned by an ANP, providing open and equal access to many BSP that may
simultaneously offer services to each customer via multiple virtual Ethernet connections.
In this scenario the presence of the NT owned by the ANP is mandatory. The NT provides standard Ethernet
multi-port interface(s) to the BSPs, with one (or more) different port(s) for each BSP. Each BSP can provide
terminals (Home Gateway, Analogue Telephony Adapters, VoIP phones, IPTV Set Top Box) to its customer
in order to deliver its services.
In any case, the deployment of a NT with standard Ethernet interface enables the definition of service models where
other Customer Premises Equipment (CPE) and terminals are provided by the BSP or alternatively can be purchased on
the retail market by the customer.
Both scenarios have a different impact on the requirements of the NT, but it is expected that having a NT device would:
• define a clear interface to allow the separation of responsibilities between the BSP and the ANP;
• help an ANP, providing wholesale services, to troubleshoot directly the end point of the access network at the
NT-side, allowing end-to-end service assurance on the NGAN;
• allow the evolution of home networks and all IP-based services independently from the FTTx access network
technology.
However, since the NT is a L2 device, in case of multi-BSP-per-customer there are the following limitations:
• a separate IP home subnetwork corresponds to each different BSP offering, so the customer cannot benefit
from a single home network, and interaction between services of different broadband service providers are
impossible within the home network;
• internal home network cabling becomes increasingly complex, if differentiation of broadband service
providers is made through different physical interfaces;
• the ANP needs to strictly isolate each BSP L2 flow, and cannot benefit from statistical multiplexing on the
local (sub)loop and on the aggregation network.
In conclusion, the multi-BSP-per-customer scenario provides the following features:
• free choice for the customer to compose its own bundle of services from different BSPs;
• separation of responsibilities between the ANP investing in the infrastructure (responsible of the access
network, including the NT) and the different BSPs (responsible of the home network and the services provided
to the end customer).
Figure 1 describes the reference architecture related to the use of a Network Termination device with standard Ethernet
interface and different CPEs at the customer site.
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6 ETSI TS 102 973 V1.1.1 (2008-09)

By means of a residential Home
Gateway with different integrated or
externally added LAN technologies
(e.g. WLAN, PLT), a home
ANP provides and maintains the NT
network may be created and
with the Access Network technology at
mainteined by the BSP
that customer site (e.g. VDSL2)
Network-Service
Interface (1.n Ethernet)
at customer home)
BROADBAND SERVICE PROVIDER
ACCESS NETWORK PROVIDER
HOME
HG#1
NETWORK
ACCESS
NT
NETWORK
HG/
device#2
The wholesale service at the ANP-BSP
A terminal device may
interface remains unchanged (e.g.
offer services such as
Ethernet L2 bitstream), also upon
VoIP and IPTV
upgrades of Access Network and NT

Figure 1: Reference architecture for use of a Network Termination in NGN
NT high-level functionalities
The main features of the NT device, that are defined in the present document, are:
• termination of the access network at the customer premise, whatever access technology is used (ADSL2+,
VDSL2, GPON, Point-to-Point FTTH with 100Base-BX):
- when existing twisted pair lines and VDSL2 technology is used in the access, NT is self-installing by the
customer on the existing POTS/ISDN termination connector;
• it is locally powered;
• it is under complete ownership and responsibility of the ANP, for provisioning and assurance purposes; remote
management of the NT is a possible feature;
• it is equipped with (at least) one standard LAN-technology Ethernet interface, for the interconnection to
CPE/Home Gateways/Terminals provided by BSPs or ASPs;
• it may be equipped with more than one physical LAN Ethernet interface in order to enable multiple service
devices and multi-BSP offerings;
• it supports VLAN traffic segregation and related functionalities;
• optionally, it may provide upstream QoS functionalities to enable L2 bitstream services; this feature is
especially needed when there is a bottleneck in the upstream, more relevant in case of xDSL access;
• optionally, it may be remotely managed (firmware upgrade included).
The following functionalities are not required for the NT device:
• lifeline in case of power interruption;
• VoIP/FXS ports and related functionalities;
• any other LAN interfaces except Ethernet;
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7 ETSI TS 102 973 V1.1.1 (2008-09)
• in case of multiple-BSP scenario, the intra-LAN connectivity between devices connected to different BSPs (in
this case, the communication between these devices will use the WAN interface and geographical network).
Such a NT device may support a wholesale business model for L2 bitstream services over the Next Generation Access
Network.
Reference block diagram for NT
In the present document, the possible functionalities of the NT device are organized in a set of functional blocks, that
may be included or not included in the device depending upon specific implementations and deployments.
NT
E
T
H
LAN-WAN L2 QOS MANAGEMENT
E
(
M S R
W
(
I N
O x U
N
A
D
E
R L
G
N
S
T T
P L
L I
I
P E L
N
-
t O
L A
- T
P
P
E N
R
E
O
F R P
I
G
R
N
T
F O
P
T T
T
A
R
O E
H
O
C
T
N R
)
E R
)
F
A
REMOTE MANAGEMENT
C
E
and FIRMWARE UPGRADE
PHYSICAL USER INTERFACE
Figure 2: Reference block diagram for the Network Termination device
As outlined in figure 2, the functional blocks of the NT device are the following:
• Physical user interface, as defined in the general requirements of the NT device (clause 4), including LEDs
and buttons/switches.
• WAN physical interface (clause 5), that must be either xDSL, GPON or Point-to-point FTTH. The logical
framing on the WAN interface (clause 6) is L2 Ethernet, but in case of xDSL/ADSL2+ also ATM framing
must be supported.
• Ethernet LAN interface (clause 7), that must be equipped with either a single LAN port (single service
provider scenario) or with multiple LAN ports (multiple service provider scenario).
• IP functionalities (clause 8) are not required, except when a TCP/IP based remote management feature is
requested.
• LAN-WAN QoS functionalities for the upstream traffic (clause 9), may be required, e.g. in case of VDSL2
NT with multiple LAN ports.
• The remote management functional block (clause 11) is optional and may be implemented with different
solutions, depending upon the access technology on the WAN interface.
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8 ETSI TS 102 973 V1.1.1 (2008-09)
1 Scope
The present document describes a proposal of requirements for a Network Termination (NT) device in Next Generation
Access Networks.
2 References
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.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] CENELEC EN 50173-1 (2007): "Information technology - Generic cabling systems -
Part 1: General requirements".
[2] CENELEC EN 50173-4 (2007): "Information technology - Generic cabling systems -
Part 4: Homes".
[3] DSL Forum TR-124 (December 2006): "Functional Requirements for Broadband Residential
Gateway Devices".
NOTE: Available at: www.dslforum.org/techwork/tr/TR-124.pdf.
[4] DSL Forum TR-068 (May 2004): "Base Requirements for an ADSL Modem with Routing".
NOTE: Available at www.dslforum.org/aboutdsl/Technical_Reports/TR-068.doc.
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9 ETSI TS 102 973 V1.1.1 (2008-09)
2.2 Informative references
The following referenced documents are not essential to the use of the present document but they assist the user with
regard to a particular subject area. For non-specific references, the latest version of the referenced document (including
any amendments) applies.
[i.1] Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of the Member
States relating to electromagnetic compatibility.
[i.2] Directive 1999/5/EC of the European Parliament and of the Council of 9 March 1999 on radio
equipment and telecommunications terminal equipment and the mutual recognition of their
conformity.
[i.3] Council Directive 73/23/EEC of 19 February 1973 on the harmonization of the laws of Member
States relating to Electrical Equipment designed for use within certain voltage limits.
[i.4] Council Directive 93/68/EEC of 22 July 1993 amending Directives 87/404/EEC (simple pressure
vessels), 88/378/EEC (safety of toys), 89/106/EEC (construction products), 89/336/EEC
(electromagnetic compatibility), 89/392/EEC (machinery), 89/686/EEC (personal protective
equipment), 90/384/EEC (non-automatic weighing instruments), 90/385/EEC (active implantable
medicinal devices), 90/396/EEC (appliances burning gaseous fuels), 91/263/EEC
(telecommunications terminal equipment), 92/42/EEC (new hot-water boilers fired with liquid or
gaseous fuels) and 73/23/EEC (electrical equipment designed for use within certain voltage limits).
[i.5] IEEE 802.3ah: "IEEE Standard for Information Technology - Telecommunications and
information exchange between systems - Local and metropolitan area networks - Specific
requirements - Part 3: Carrier Sense Multiple Access With Collision Detection (CSMA/CD)
Access Method and Physical Layer Specifications Amendment: Media Access Control Parameters,
Physical Layers, and Management Parameters for Subscriber Access Networks".
[i.6] IETF RFC 2684: "Multiprotocol Encapsulation over ATM Adaptation Layer 5".
[i.7] IEEE 802.1p: "Standard for Local and Metropolitan Area Networks - Supplement to Media Access
Control (MAC) Bridges: Traffic Class Expediting and Dynamic Multicast Filtering".
[i.8] ISO/IEC 8802-3: "Information technology - Telecommunications and information exchange
between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier
sense multiple access with collision detection (CSMA/CD) access method and physical layer
specifications".
[i.9] IEEE 802.1ag: "IEEE Standard for Local and Metropolitan Area Networks Virtual Bridged Local
Area Networks Amendment 5: Connectivity Fault Management".
[i.10] ITU-T Recommendation G.984 (all parts): "Gigabit-capable Passive Optical Networks (GPON)".
[i.11] IEEE 802.1q: "IEEE Standard for Local and Metropolitan Area Networks - Virtual Bridged Local
Area Networks".
[i.12] ITU-T Recommendation K.21: "Resistibility of telecommunication equipment installed in
customer premises to overvoltages and overcurrents".
[i.13] ITU-T Recommendation K.44: "Resistibility tests for telecommunication equipment exposed to
overvoltages and overcurrents - Basic Recommendation".
[i.14] ITU-T Recommendation G.992.1: "Asymmetric digital subscriber line (ADSL) transceivers".
[i.15] ITU-T Recommendation G.992.3: "Asymmetric digital subscriber line transceivers 2 (ADSL2)".
[i.16] ITU-T Recommendation G.992.5: "Asymmetric Digital Subscriber Line (ADSL) transceivers -
Extended bandwidth ADSL2 (ADSL2plus)".
[i.17] ITU-T Recommendation G.997.1: "Physical layer management for digital subscriber line (DSL)
transceivers".
ETSI
10 ETSI TS 102 973 V1.1.1 (2008-09)
[i.18] ITU-T Recommendation G.994.1: "Handshake procedures for digital subscriber line (DSL)
transceivers".
[i.19] ITU-T Recommendation G.993.2: "Very high speed digital subscriber line transceivers 2
(VDSL2)".
[i.20] ITU-T Recommendation I.361: "B-ISDN ATM layer specification".
[i.21] ITU-T Recommendation I.365: "B-ISDN ATM adaptation layer sublayers".
[i.22] DSL Forum WT-115: "G.VDSL2 Functionality Test Plan".
[i.23] DSL Forum TR-067: "ADSL Interoperability Test Plan".
[i.24] DSL Forum TR-100: "ADSL2/ADSL2plus Performance Test Plan".
[i.25] DSL Forum WT-105: "G.992.3/5 ADSL2/ADSL2plus Functionality Test Plan".
[i.26] DSL Forum WT-114: "G.VDSL2 Performance Test Plan".
[i.27] DSL Forum WT-107: "Internet Gateway Device Data Model Version 2" (includes bonded DSL).
TM
[i.28] DSL Forum TR-098: "DSLHome Internet Gateway Device Version 1.1 Data Model for
TR-069".
[i.29] DSL Forum TR-069: "CPE WAN Management Protocol".
[i.30] DSL Forum PD-128: "Test Plan for TR-069 Plugfests".
[i.31] SFF-8472: "Specification for Diagnostic Monitoring Interface for Optical Transceivers".
NOTE: Available at: [ftp://ftp.seagate.com/sff/SFF-8472.PDF].
3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ADSL Asymmetric Digital Subscriber Line
AES Advanced Encryption Standard
AN Access Network
ANP Access Network Provider
ATM Asynchronous Transfer Mode
BER Bit Error Rate
BSP Broadband Service Provider
CBR Constant Bit Rate
CO Central Office
CoS Class of Service
CPE Customer Premises Equipment
DBRu Dynamic Bandwidth Report upstream
DHCP Dynamic Host Configuration Protocol
DSCP DiffServ Code Point
DSLAM Digital Subscriber Line Access Multiplexer
EFM Ethernet in the First Mile
EMC Electric Magnetic Compatibility
FE Fast Ethernet
FEC Forward Error Correction
FTTH Fiber To The Home
FTU Fiber Termination Unit
FXS Foreign eXchange Station
GEM G-PON Encapsulation Method
GPON Gigabit Passive Optical Network
ID Identifier
IGMP Internet Group Management Protocol
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11 ETSI TS 102 973 V1.1.1 (2008-09)
IPTV Internet Protocol TeleVision
ISDN Integrated Services Digital Network
LAN Local Area Network
LED Light Emitting Diode
MIB Managed Information Base
MTBF Mean Time Between Failure
NGAN Next Generation Access Network
NGN Next Generation Network
NRZ Non Return to Zero
NT Network Termination
OAM Operations, Administration & Maintenance
OMCI ONT Management Control Interface
ONT Optical Network Termination
ONU Optical Network Unit
P2P Point to Point
PBO Power Back-Off
PoP Point of Presence
POTS Plain Old Telephone Service
PSD Power Spectral Density
PTM Packet Transport Mode
PVC Permanent Virtual Connection
QoS Quality of Service
SP Strict Priority
T-CONT Transmission Container
TCP/IP Transmission Control Protocol/Internet Protocol
ToIP Telephony over IP
ToS Type of Service
UBR Unspecified Bit Rate
USB Universal Serial Bus
VBR Variable Bit Rate
VCI Virtual Connection Identifier
VDSL Very high bit-rate Digital Subscriber Line
VLAN Virtual Local Area Network
VoIP Voice over IP
VPI Virtual Path Identifier
VTU VDSL Transceiver Unit
WAN Wide Area Network
WDM Wave Division Multiplexing
WFQ Weighted Fair Queuing
4 General requirements
4.1 Hardware and case characteristics
Specific requirements:
1) Customized case (the case will be customized by each operator) with small form factor, also allowing
wall-mount. Specific recommended dimensions, in case of xDSL WAN-side technology, are 5 × 5 × 2 cm.
In case of optical WAN-side technology, no specific dimensions are defined (mainly determined by the size of
the Fiber optic cabling protective storage space, as minimum bend radius).
2) [GPON] [PtP FTTH] The design of the NT shall provide a mechanism that protects the fiber optic cabling
against tampering by the end user. This can be realized by a functional component of the NT-housing which is
referenced by as the Fiber Termination Unit (FTU). For the FTU the following requirements apply:
- The FTU shall provide a fool proof and robust method of interconnection with the NT active
component/module ("mount and click" system without any fiber optic cabling between the FTU and NT).
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12 ETSI TS 102 973 V1.1.1 (2008-09)
- The NT (module) shall be easily interchangeable without dismounting or dismantling the FTU exposing
the fiber optic cabling.
- The FTU (including the mounted NT) shall support a robust wall-mounted installation with all
connectors facing downward or sideward.
- The FTU shall provide a sealable protective storage space that fits an excess length of 1 meter for two
fiber optical cables (one spare and one in use).
- It shall be possible for service operator to access and use the spare fiber without disrupting the service on
the first fiber.
- The FTU shall have a pull relief for the fiber ducts or fiber cables.
- The FTU shall be fitted with a lock-mechanism or seal to prevent un-authorized access to the fiber optic
cabling.
- It shall be possible to open the FTU without removing the NT and disrupting the service.
3) The following LED indicators must be present:
- 1 LED for power.
- 1 LED for VDSL2/GPON/PtP FTTH interface status.
- 1 LED for each Ethernet port.
- Color, behavior and meaning of different LED status must be compliant with following DSL Forum
TR 124 [3] requirements:
REGIONAL.NA.LED. 7 (LED visibility).
REGIONAL.NA.LED. 8 (duty cycle).
REGIONAL.NA.LED. 9 (power indicator).
REGIONAL.NA.LED. 9 (WAN interface status).
REGIONAL.NA.LED. 13 (LAN interfaces status).
4) [VDSL2] Start-up time: the NT must be fully operational and begin the VDSL2 hand-shaking phase within
5 seconds.
5) [GPON] [PtP FTTH] Start-up time: the NT must be fully operational within 5 seconds.
6) The minimum MTBF should be at least 220 000 hours.
7) [OPTIONAL], The NT shall have an on/off hardware button for switching on/off the device.
8) Optionally, the NT shall have a hardware button that allows a two-step reset process:
- renewal of its DHCP-configuration, if any (i.e. pressing the button for less than 5 seconds);
- return to factory default settings (i.e. pressing the button for more than 5 seconds).
9) If present, the design of the hardware button (bullet 7) shall prevent accidental activation.
4.2 Powering characteristic
Specific requirements:
10) The power supply MUST be external, in switching (not linear) technology and connected to the device using a
connector.
11) The contra-connector on the NT-housing MUST contain a pull relief mechanism that prevents accidental
removal of the power supply connector.
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13 ETSI TS 102 973 V1.1.1 (2008-09)
12) The external power supply MUST operate with AC mains supply rate voltage at 50 Hz to 60 Hz between at
least 110 Vac (-10 % as tolerance) and 240 Vac (+6 % as tolerance).
13) The power efficiency of the external power supply must be compliant with Code of Conduct External Power
Supply version 2 November 2004.
14) The power absorbed by the power supply in not load (NT in off position or disconnected from power supply)
condition MUST be lower than 0,3 W.
15) The NT power consumption must be compliant to the European Code of Conduct for broadband devices
[European Commission "Code of Conduct on Energy Consumption of Broadband Equipment (version 1.2)" -
April 2007 Draft], annex B.1 Tier 2 related to 2008 timeframe]:
- For ADSL-only the maximum power must be lower than 4 W.
- For VDSL2 the maximum power must be lower than 6 W.
- In case of multiple Ethernet LAN ports, the maximum additional power must be less than 2 W.
- For GPON modems, version 2 of the Code of conduct (http://re.jrc.cec.eu.int/energyefficiency/) issued
the 17th of July 2007 advertises some values to be applicable from 2009. firstly they apply to an ONT
comprising 1 GPON interface, 1 10/100/1000 Ethernet UNI port and 1 USB device.
- 0,3 W Off position max consumption.
- 12 W Max in operation.
- TBD (to be defined) stand by mode consumption.
4.3 Electrical and Mechanical Protection, Safety, EMC and
Environmental Safety (Eco-Compatibility)
In case of no other country-specific requirements are provided, the following specific requirements apply.
16) The device shall meet all essential technical requirements under the EMC Directive 89/336/EEC [i.1], to
ensure an adequate level of Compatibility for apparatus intended to be used in the residential environments.
17) The device and all the included accessories shall be constructed in order not to be dangerous for users, service
personnel and in order to reduce the risk of fire. Such requirements are defined "essentials", so mandatory, by
European Directives 1999/5/EC [i.2], 73/23/EEC [i.3] "Low Voltage Directive" and 93/68/EEC [i.4] "CE
Marking".
18) The device shall comply with requirements defined by ITU-T Recommendations K.21 [i.12] and K.44 [i.13].
19) The device in case of optics shall be designed so as to insure safety of end user's eyes.
In order to minimize risks of disturbance between systems, in contexts where several transmission technologies will
have to co-exist, solutions are requested to avoid that mis-insertion of one modem type could harm the system already
running on the medium itself (shared medium). In particular, it must be avoided that a P2P optical NT, if plugged by
error on a GPON access, disturbs transmission for all other users connected to the same PON.
20) [OPTICAL, applicable in contexts where several transmission technologies will have to coexist] The NT must
keep its transmitter disabled (or at minimum transmit power), till it recognizes data required from the MAC
synchronizing pattern in the downstream flow from LT. Then on, proper link layer negotiation can start.
This solution will have to be discussed with system vendors to confirm feasibility without prohibitive extra
cost, and shall preferably have no impact on the IEEE 802.3ah [i.5] Physical Medium Dependent sublayer
specifications that are applicable for P2P architectures.
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14 ETSI TS 102 973 V1.1.1 (2008-09)
5 WAN physical interfaces
The following different and alternative options for the NT WAN interface are addressed by these requirements, in order
to support specific WAN technologies:
• ADSL2+ only.
• VDSL2 only.
• VDSL2 and ADSL2+.
• GPON.
• Point-to-point FTTH based on 100Base-BX technology.
A specific different NT device is foreseen to support each single WAN technology, therefore it is not required the
support of all these technologies in a single device.
This technology list remains open to further access options for instance WDM that can be combined with the point to
point options listed below and will be with future PON generations.
5.1 xDSL physical connector
21) xDSL WAN interface with RJ-45 connector [1] and [2] with specific color coding (DSL Forum TR-068 [4]
requirement I - 37). As an alternative, depending on regional specific requirements, RJ-11 connector may be
used. In order to facilitate compatibility with regional specific requirements, it is recommended to adopt in the
NT a female RJ45 connector able to accept both RJ45 and RJ11 male connectors alternatively.
5.2 ADSL2+ specific characteristics
22) The NT must conform to ITU-T Recommendation G.992.1 [i.14], (ADSL) annex A, ITU-T Recommendation
G.992.3 [i.15], (ADSL2) annex A and ITU-T Recommendation G.992.5 [i.16], (ADSL2plus) annex A.
23) The NT must be able to guarantee, in the interworking with the DSLAM platforms, at least the same ADSL1
performances as requested in DSL Forum TR-067 issue 2 [i.23], related to ITU-T Recommendation
G.992.1 [i.14], annex A European systems.
24) The NT must be able to guarantee, with reference to DSLAM platforms, at least the same ADSL2 and
ADSL2plus performances as requested in DSL Forum TR-100 [i.24] and in the latest version of DSL Forum
WT-105 [i.25], related to ITU-T Recommendations G.992.3 [i.15] and G.992.5 [i.16], annex A European
systems.
25) The device must be conform to ITU-T Recommendation G.997.1 [i.17], with specific regard to the following
issues:
- ITU-T Recommendation G.997.1 [i.17], section 7.3.1.3: configuration and control of transmitted power
levels through appropriate tuning of DS/US SNR margin parameters; more specifically the maximum
noise margin, target noise margin and minimum noise margin.
- ITU-T Recommendation G.997.1 [i.17], section 7.4: management of inventory information: Vendor ID,
System Vendor ID, Version Number, Serial Number, Self-Test Result, ADSL Transmission System
Capabilities.
- ITU-T Recommendation G.997.1 [i.17], section 7.5: management of the following parameters: Line test,
diagnostics and status parameters (section 7.5.1) and Channel status parameters (section 7.5.2).
26) The NT must be able to transmit for every DSLAM platforms supported its vendor ID according to the coding
specified in ITU-T Recommendation G.994.1 [i.18].
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15 ETSI TS 102 973 V1.1.1 (2008-09)
5.3 VDSL2-only specific characteristics
27) Compliancy with ITU-T Recommendation G.993.2 [i.19]; moreover the VDSL2 line system must be
compliant with ITU-T Recommendation G.993.2 [i.19], Corrigendum 1 and Amendment 1.
28) Compliancy with the international standards of the ITU-T:
- ITU-T Recommendation G.997.1 [i.17], Physical layer management for digital subscriber line (DSL)
transceivers.
- ITU-T Recommendation G.997.1 [i.17], Physical layer management for digital subscriber line (DSL)
transceivers (Corrigendum 1).
- ITU-T Recommendation G.997.1 [i.17], Physical layer management for digital subscriber line (DSL)
transceivers (Amendment 1).
- ITU-T Recommendation G.994.1 [i.18], Handshake procedures for digital subscriber line (DSL)
transceivers.
- ITU-T Recommendation G.994.1 [i.18], Handshake procedures for digital subscriber line (DSL)
transceivers (Amendment 1).
- ITU-T Recommendation G.994.1 [i.18], Handshake procedures for digital subscriber line (DSL)
transceivers (Amendment 2).
29) The device must be conform to ITU-T Recommendation G.997.1 [i.17], with specific regard to the following
issues:
- ITU-T Recommendation G.997.1 [i.17], section 7.3.1.3: configuration and control of transmitted power
levels through appropriate tuning of DS/US SNR margin parameters; more specifically the maximum
noise margin, target noise margin and minimum noise margin.
- ITU-T Recommendation G.997.1 [i.17], section 7.4: management of inventory information: Vendor ID,
System Vendor ID, Version Number, Serial Number, Self-Test Result, ADSL Transmission System
Capabilities.
- ITU-T Recommendation G.997.1 [i.17], section 7.5: management of the following parameters: Line test,
diagnostics and status parameters (section 7.5.1) and Channel status parameters (section 7.5.2).
30) The NT must be able to transmit for every DSLAM platforms supported its vendor ID according to the coding
specified in ITU-T Recommendation G.994.1 [i.18].
31) The NT must be able to guarantee, with reference to DSLAM platforms, at least the same VDSL2 as requested
in latest version DSL Forum WT-114 [26] and in latest version of DSL Forum WT-115 [i.22], related to ITU-
T Recommendation G.993.2 [i.19], annex B European systems.
32) Profiles supported: All profiles defined in table 6-1 of ITU-T Recommendation G.993.2 [i.19] shall be
supported.
33) Bandplans supported: All bandplans defined in annex B of ITU-T Recommendation G.993.2 [i.19],
Amendment 1 shall be supported.
34) Interworking with customer premises network and coexistence with POTS
35) [OPTIONAL] coexistence with ISDN, PSD-Masks supported: All PSD masks defined in annex B of ITU-T
Recommendation G.993.2 [i.19] shall be supported.
36) Co-existence of cabinet-based VDSL2 deployments with CO-based ADSL2+ deployments in the same binder:
- Interoperability with a VTU-C that uses MIB PSD mask (ITU-T Recommendation G.993.2 [i.19],
section 7.2).
- Downstream PSD shaping as defined in ITU-T Recommendation G.997.1 [i.17].
37) Application of PBO mechanisms on both Upstream (UPBO) and Downstream (DPBO) paths, according to
ITU-T Recommendations G.993.2 [i.19] and G.997.1 [i.17] methods.
ETSI
16 ETSI TS 102 973 V1.1.1 (2008-09)
38) The support of all tone sets defined in the amendments to ITU-T Recommendation G.994.1 [i.18].
39) PTM-EFM support.
40) The device must interwork with any VTU-C VDSL2 chipset and DSLAM technologies.
5.4 VDSL2 and ADSL2+ specific characteristics
The following additional requirements apply in case of VDSL2 NT with ADSL2+ backward compatibility:
41) ADSL/ADSL2+ (ATM encapsulation) backward compatibility with full auto-sensing, in terms that no action
on the device is needed (i.e. no reboot) during or after the switch from ADSL2+ to VDSL2 and vice-versa
(seamless experience for the end user).
42) ADSL/ADSL2+ support and auto-sensing feature must not limit the full support of any VDSL2 profiles, when
working in VDSL2 mode.
43) In case of ADSL/ADSL2+ working mode, bridging between LAN side VLANs and WAN side ATM PVCs.
44) Different configuration profiles for ATM and PTM modes must be automatically activated by the NT, in
relationship with VDSL2 - ADSL/ADSL2+ auto-sensing functionality (The NT must hold both configuration
sets, for ADSL -PVCs- and VDSL2 -VLANs-).
5.5 GPON-specific characteristics
In the current clause, the GPON NT is referred as ONT.
45) The GPON interface must be compliant with ITU-T Recommendation G.984 (all parts) [i.10].
46) Single fiber transmission is used for optical transmission (both in the upstream and downstream direction) and
bidirectional transmission is accomplished by use of a WDM technique called diplex defined in ITU-T
Recommendation G.984.5 [i.10].
47) The ONT supports a maximum logical reach in conformance with ITU-T Recommendation G.984.1 [i.10]
(i.e. 60 km).
Synchronization
48) The ONT supports the use of a clock extracted from the optical interface in conformance with section 6.4.1 of
ITU-T Recommendation G.984.3 [i.10].
49) The ONT supports internal timing for holdover operation with ±20 ppm accuracy. The ONT uses the free run
clock only if the input cloc
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