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interoperability, management, and response of these systems across the demand and operational
range.

Some reference values for the metrics defined in ITU‐T are available in L.1340: "Informative values
27
on the energy efficiency of telecommunication equipment ".
The growing demand for Internet connections from both governments and citizens is driving the
rapid increase in worldwide deployment of broadband and ultra‐broadband networks. Depending
on the specific geographic, demographic and economic conditions, such networks can be either
fixed (based on FTTx architectures and implementing technologies such as ADSL, ADSL2plus, VDSL2,
GPON, GEPON, etc.) or mobile (based on HSPA, LTE, UMTS, etc.).

The increasing deployment of broadband and ultra‐broadband networks has a real impact on energy
consumption and, in more general terms, on the carbon footprint. To address the critical issue of
energy efficiency, it is essential that particular attention be given to the choice of specific
technologies during the planning phase. An informed choice of available energy‐efficient
telecommunication equipment is fundamental to reducing energy consumption while guaranteeing
the desired level of quality of service (QoS) and reliability.

Recommendation ITU‐T L.1340 provides informative values on the energy efficiency of different
types of telecommunication network equipment and small networking equipment used in both the
fixed and mobile networks.

Informative values for digital subscriber line access multiplexer (DSLAM), multi‐service access
28
code (MSAN) and optical line termination (OLT) equipment :
This clause defines the informative values with respect to the energy efficiency metrics defined for
the specific technologies used by DSLAM, MSAN and OLT equipment. More precisely, this clause
covers the:
 DSLAM equipment and MSAN equipment implementing ADSL2plus, VDSL2 and POTS
technologies.
 OLT equipment implementing the gigabit passive optical network (GPON), gigabit Ethernet
passive optical network (GEPON) and point‐to‐point (PtP) technologies.

For these equipment typologies, the most commonly used metric is the Pport, which considers the
number of ports at a fixed load as a functional unit.

Where:

PEQ is the power (in Watts) of a fully equipped wireline network equipment with all its line cards
working in a specific profile or state (e.g., all VDSL2 subscriber lines in L0 state, all ADSL2plus

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27 Recommendation ITU‐T L.1340 provides informative values on the energy efficiency of different types of
telecommunication network equipment and small networking equipment in use in both the fixed and
mobile networks. These values are related to energy efficiency metrics, test procedures, methodologies
and measurement profiles that have been defined in Recommendation ITU‐T L.1310. These informative
values are intended to be a valued reference resource for those in the process of choosing the most
energy‐efficient technologies for network upgrade and deployment and, in so doing, reducing the carbon
footprint of the Information and Communication Technology (ICT) sector.

28 ITU‐T L.1340 "Informative values on the energy efficiency of telecommunication equipment"

272 ITU‐T's Technical Reports and Specifications