Nt1310 Unit 6 Team Work

I participate in team of FTTX meeting.Engineer and technicians speak about faulty modems and card failures .The team leader has made the work sharing..In addition;I learned some concepts such as Xdsl,ADSL,DSLAM.Some information about DSL;

Digital Subscriber Line, or DSL, is a technology for bringing high-bandwidth connectivity to homes and small businesses over ordinary copper telephone lines. xDSL refers to the family of digital subscriber linetechnologies, such as ADSL, HDSL, and RADSL. Connection speeds for DSL typically range from 1.544 Mbps to 512 Kbps downstream and around 128 Kbps upstream. In addition, a DSL line allows for one line to carry both voice and data signals, and for the data part of the line to be continuously connected. DSL achieves higher data transfer rates by utilizing more of the available bandwidth spectrum. Ordinary telephone service only makes use of the 0 – 3400 Hz frequency range, which accounts for the 56 Kbps speed limit on standard analog modems. DSL eludes the 3400 Hz frequency boundary by outmoding the digital-to-analog conversion that modems perform and

And unlike cable modems, DSL is not a bus technology, so the bandwidth available to the end user is more consistent.However, despite all of its positive attributes, DSL is not without flaw. For instance, in order to be eligible for DSL, the end user must be geographically within a certain distance from the central telephone office,otherwise the signal degradation is too great and DSL is unfeasible (for ADSL that distance is two miles.) In addition, numerous standards still exist for DSL,hardware is still comparatively pricey, and service is available only in limited areas. Despite these drawbacks, DSL is still a faster alternative to analog modems and ISDN, and should rival cable modems as far as actual bandwidth