Downstream Bit Rate Calculation for ADSL2+ Loops Limited with Far-end Crosstalk (CROSBI ID 529652)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mikac, Vedran ; Bažant, Alen ; Ilić, Željko
engleski
Downstream Bit Rate Calculation for ADSL2+ Loops Limited with Far-end Crosstalk
In this paper an efficient method for downstream bit rate calculation on ADSL2+ local loops limited by crosstalk is presented. Crosstalk is one of the most limiting factors in broadband cable communications. In order to calculate bit rate of ADSL2+ loops we have done an in-depth analysis of a local telecom operator's cable infrastructure in terms of crosstalk. On the basis of measurements carried out on twisted quad cables in a frequency range up to 2.2 MHz, we have derived theoretical models of far-end crosstalk (FEXT) and insertion gain. The measurements were performed on cables that are part of an operating infrastructure, not on cables on a reel, thus providing a true insight into the situation telecoms worldwide are facing today. The results indicate that number and assignment of ADSL2+ to loops in a cable binder have a great impact on a bit rate. Strategy of allocating ADSL2+ to loops inside the cable binder reduces level of interference between users, allowing, in this case, traffic prediction and dynamic access to spectrum available in a cable. Presented bit rate calculation method and crosstalk models are crucial foundation for spectrum management used in a process of local loop unbundling, which is lawful obligation of numerous incumbent telecom operators.
ADSL2+; star quads; FEXT; insertion gain; spectrum management
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Podaci o prilogu
1-6.
2007.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of the SoftCOM Conference
Split:
978-953-6114-95-5
Podaci o skupu
15th SoftCOM Conference 2007
predavanje
27.09.2007-29.09.2007
Dubrovnik, Hrvatska; Split, Hrvatska