O'Reilly logo

DSL Advances by Peter J. Silverman, John M. Cioffi, Massimo Sorbara, Thomas Starr

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

8.4. Line Sharing

Line sharing unbundles a portion of the frequencies conveyed by a telephone line. The frequency band above approximately 4 kHz is used by the data service provider while the frequency band below 4 kHz is used by the voice service provider. Thus, two different service providers simultaneously share the same line. A splitter device at the network end of the line combines the data and voice-band signals while preventing interference between the two transmission bands. The splitter consists of a high-pass filter leading to the DSLAM and a low-pass filter leading to the voice switch. The high-pass filter is most often implemented as a pair of dc (direct current) blocking capacitors whose principal function is to avoid disruption ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required