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

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

DTS/ATTM-02004

General Information

• Status: Published
• Publication Date: 31-Aug-2008
• Technical Committee: ATTM AT2 - Infrastructure, Physical Networks & Communication Systems
• Current Stage: 12 - Completion
• Due Date: 07-Aug-2008
• Completion Date: 01-Sep-2008

Standards Content (Sample)

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

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



Reference
DTS/ATTM-02004
Keywords
access, network
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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

ETSI

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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".
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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,
...