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This article presents a review of the investigation of the possibility of increasing the efficiency of existing line test solutions for troubleshooting testing for IPTV over xDSL, by the results of experimental research on real system under commercial exploitation. At the beginning of this article the main weaknesses of the existing troubleshooting testing are described. In the continuation of the...
This paper compares the values of data link layer QoS (Quality of Service) indicators of several access lines, which can serve as a measure of the physical link quality or QoPh (Quality of Physical Layer), in real environment without reference video signal (No Reference), during the delivering of IPTV (Internet Protocol Television) multicast services to multiple users. It also focuses on the fact...
This paper analyses the impact of access network of physical impairments in DSL environment caused by primary parameters imperfections. It also analyses the correlation of BER (Bit Error Rate) and error control of DSL system with values of MDI (Media Delivery Index) which gives an indication of expected IPTV (Internet Protocol Television) QoE (Quality of Experience). Also this paper gives a review...
This paper analyses a dependence of standard definition IPTV service continuity error on code violation block codes. A very reliable method of evaluating of several IPTV QoS parameters by observing the parameters of physical layer of DSL transceivers was introduced. Also, an ability to use the procedures, which have already implemented at common ATU-R and ATU-C ADSL2+ modems for estimation of IPTV...
This paper analyses qualitative and quantitative impact of large number twisted pairs transmitting ADSL signal, on one specific pair in the same cable. Change of pair capability to establish ADSL signal in respect to number of near active ADSL signals is observed. Information capacity is chosen as parameter of observed pair quality. At the beginning of this paper, simplified mathematical model of...
This paper gives brief overview of possible methods for approximate locating of galvanic faults in cables with symmetrical copper pair cables as well as possible methods of repairing the same ones. The main focus is based on two principal methods of locating faults like the use of measuring instruments that run on the basis of bridge measuring methods and measuring instruments which use time domain...
This paper analyses possibility of ADSL signal over long symmetrical copper-based twisted pair (about 7000 meters) establish. Got rate, its stability and possibility of its increase by effect on symmetrical copper-based pair primary parameters is analysed. Establishment of stable rate ADSL signal of enough value can be used for multimedia services providing through such ADSL system. Pair from 7100...
This paper researches changing of some basic parameters of symmetrical copper based twisted pair which is near the other twisted pair where active ADSL service exists. Analyzed parameters are: attenuation, signal to noise ratio, wideband noise and characteristic impedance. Analyzed subject is one pair in cable whose capacity is 100 x 2 x 0.4, with foamed polyethylene insulation and laminated polyethylene...
This paper is analyzing how some symmetrical-cooper-twisted-pair parameters take effect to of ADSL services. The treated parameters are insulation resistance, hop resistance and attenuation (on several significant frequencies). As the parameter of quality of service the bit-rate (both up-stream and down-stream bit-rate) is used. The testing transmission line is twisted pair placed in low-band telecommunication...
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