The increasing trend of triple play traffic transmission (voice, video and data) over internet is a worldwide phenomenon.
However, to get a satisfactory communication, we need study the process on end-the-end way. Into regions with little
infrastructure of telecommunications, one of the concerns is about used technologies of access. This work presents an
analysis based on an IPTV (Television Internet Protocol) transmission generated on two combined technologies of
access, PLC (PowerLine Communications) and ADSL2+ (Asymmetric Digital Subscriber Line), using a combination of
electric network and telephony infrastructure, called of pDSL. This technology is a viable combination for regions with
poor infrastructure of telecommunications. The results are evaluated with intention to present the viability of this kind of
the telecommunication environment and with a simulation for extrapolation study.
KEYWORDS: Video, Fuzzy systems, Video compression, Fuzzy logic, Computer simulations, Computer networks, Computing systems, C++, Data modeling, Local area networks
This paper presents a model to treat the problem of process scheduling within a computer network using a fuzzy
inference system. The scheduling system implemented, simulated in the Network Simulator, acts in two particularly
points: first defining the discard priority for the applications according to its characteristics; and further, to redefine their
transfer rate, also considering its particularities; thus providing fitting transfer rates for the applications and, with it,
means for Quality of Service.
The Brazilian Amazon has sui generis characteristics that affect strongly the communication technologies, such as high humidity and temperature. These characteristics cause impact in the existent infrastructure, especially in twisted-pair copper lines. At the moment, new services are based on multimedia applications, as voice over internet protocol (VoIP), video on demand (VoD), and internet protocol television (IPTV). Such services use digital broadband networks such as ADSL2+ (Asymmetric Digital Subscriber Line) to transmit the data. Broadband services require data rates which can only be achieved by using relatively high spectrum frequencies. At high frequencies the DSL signal is more susceptible to external noise sources, such as radio frequency interference and impulsive noise. For this purpose, an experimental setup has been built at UFPA that consists of noise generator, traffic generator, real cables, modems and DSLAM (digital subscriber line access multiplexer). This paper aims at characterizing how the noise impacts on triple play services for a broadband system using a DSL loop on Amazon environment. The objective of the noise impact experimentation is to observe the behavior of a DSL system under more realistic but controlled line conditions. Metrics as lost packet, jitter, latency, and throughput are used to characterize the triple play service in a DSL loop under the noise impact. Through the real experiments and controlled loop conditions, this paper allow identify, from application level point of view, how robust DSL system is in respect to noise occurrence. Additionally, it is described a methodology for noise impact measurements using a DSL system.
Lamartine de Souza, Diego Cardoso, Marcelino Silva, Marcos Seruffo, Dário Russillo, João C. Costa, Carlos R. Francês, Agostinho L. Castro, Gervásio P. dos S. Cavalcante, Jaume Riu
Broadband services require data rates that can only be achieved by using relatively high spectrum frequencies. At such
high frequencies, the DSL (Digital Subscriber Line) signal is more susceptible to external noise sources, such as radio
frequency interference and impulsive noise. This paper aims to characterize how the impulsive noise impacts on services
and applications for a broadband system using an ADSL2+ loop. The first approach was to use the impulsive noise
defined in the standards G.996.1 (Test Procedures for DSL Transceivers) from ITU-T and TR-048 (ADSL
Interoperability Test Plan) from DSL Forum. In this approach we have also used a HDSL (High Bit Rate DSL) and white
noise disturbers on the line. The impulsive noises c1 and c2 (defined in G.996.1) are injected into the circuit at the CO
(Central Office) end and CPE (Customer Premises Equipment) end of the loop simulator. Additionally, it was analyzed
the spikes of noise's impact on the ADSL2+ line. In this case, pre-defined models of NEXT (Near-end crosstalk) and
white noise are injected on CO and CPE side, simultaneously. Metrics like packet rate, lost packet count, bandwidth,
short-term average transfer delay, and errored seconds are used to characterize the DSL loop under the noise impairments.
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