Abstract
Certain multimedia and voice services, such as VoIP, IPTV, etc., are significantly delay sensitive and their performance is influenced by the overall transmission delay and its variance. One of the most common solutions used in access networks are xDSL lines, especially ADSL2+ or VDSL2. Although these subscriber lines also use packet communication, there are several differences and mechanisms, which influence their resulting delay. Their delay characteristics are also dependent on the individual settings of each xDSL provider, therefore we decided to investigate this area for typical commercially available lines in Czech Republic. Based on the measured values and experiments with real ADSL2+ lines we also developed a potential modeling method, which is presented in this article as well. The parameters for packet jitter based on the generalized Pareto distribution were modeled.
Highlights
Today, the local area data networks and access telecommunication networks are mostly packet oriented solutions and are usually based on the Ethernet conception
The Plain Old Telephone Service (POTS) is being replaced by Voice over IP (VoIP) [3], IPTV (Internet Protocol Tele-Vision) service is used for broadcasting TV signals and a structured E1 signals can be transmitted over packet networks [4]
The digital subscriber lines represent still the most frequent technology used in access networks in Czech Republic
Summary
The local area data networks and access telecommunication networks are mostly packet oriented solutions and are usually based on the Ethernet conception. Since the packet oriented networks based on the Ethernet are dominating the local area networks and access networks, the modeling of their delay characteristics is important today. These networks are used for transmitting the time-division multiplex signals and services, which are significantly delay sensitive, their delay and jitter characteristics are very important [1], [2]. The previous generation of Asymmetric Digital Subscriber Lines (ADSL2+) is being replaced by modern Very-High Speed Digital Subscriber Lines (VDSL2) [5] Both types are considered for hybrid metallic-optical FTTx (Fiber to the ”x”) access networks, these lines will probably remain one of the most common network solutions in access networks segment. We applied the generalized Pareto distribution formula and the conclusions and comparisons are presented within the last section of this paper as well
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