Article

An update on the field trial concerning Free Cooling solution for FTTCab architecture

Authors:
Claudio Bianco
Claudio Bianco
Claudio Bianco
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Flavio Cucchietti
Flavio Cucchietti
Flavio Cucchietti
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Gianluca Griffa at Telecom Italia
Gianluca Griffa
Hong Yuping
Hong Yuping
Hong Yuping
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Abstract

The concept of the energy-saving strategy has become in recent years one of the top priorities of telecom operators and governments. To this end, the deployment of the next generation networks represents one of the main drivers towards the reduction of the energy bill. The NGN architecture can include different scenarios: FTTE, FTTCab, FTTB or FTTH. Among these, the FTTCab certainly brings the greatest challenges concerning the issue of heat dissipation. To this end, the present paper describes the first field trial (jointly carried on by Telecom Italia and Huawei) results for an innovative cooling solution: the free cooling cabinet. This system directly uses the external fresh air in order to increase the cooling efficiency. In particular, data collected from the field trial and concerning internal/external temperature, humidity as well as noise levels will be reported. Finally, the next steps of the trial will be anticipated.

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... Various proposals besides LPMs have been reported on how to save energy in DSL, for instance by the design of energy-efficient hardware modules [15][16][17], by the dimensioning and energy-efficient operation of the network processor [18], by wireless traffic aggregation at the user side and efficient line-card usage at the network side [19], by restricting the maximal margin and power cutback [20], or by the deployment of street cabinets [21][22][23]. The latter allows reducing the transmit power by shortening the cable length, and to reduce cooling requirements [24,25] by reducing the number of installed line cards. In [26] various techniques were used jointly to achieve a power reduction of around 30% in specific field trials. ...
Energy-saving by low-power modes in ADSL2
Article
Full-text available
  • Jul 2012
  • COMPUT NETW
The large number of broadband users and its forecast growth has recently triggered research on energy-efficiency in digital subscriber lines (DSLs). A promising technique are low-power modes (LPMs) as standardized in asymmetric DSL 2 (ADSL2) which let the DSL connection operate in downstream direction with reduced transmit rate and power. We study the problem of optimizing the LPM rate-level for energy-efficiency. A traffic-independent rate setting is proposed based on an analytical competitive framework. Also, a Markov chain based LPM model is derived which facilitates the fast numerical optimization of the LPM rate-level under realistic traffic models and system constraints. Simulation results under various traffic settings and DSL scenarios demonstrate energy savings by LPMs of around 30–40% of the ADSL2 transceiver’s power consumption. Furthermore, they provide insights on how to set the LPM rate-levels in practice for energy-efficient DSL operation.
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Soil temperature variations with time and depth
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