Autonomous dynamic optimization for digital subscriber line networks

✍ Scribed by Jochen Maes; Mamoun Guenach; Michael Peeters

• Publisher: Institute of Electrical and Electronics Engineers
• Year: 2010
• Tongue: English
• Weight: 459 KB
• Volume: 15
• Category: Article
• ISSN: 1089-7089
• DOI: 10.1002/bltj.20460

✦ Synopsis

25.875 kHz up to 1.104 MHz for asymmetric digital subscriber line (ADSL) and ADSL2, corresponding to downstream data rates up to 12 Mb/s. By expanding the bandwidth to 2.208 MHz (ADSL2ϩ) and 30 MHz (very high speed digital subscriber line 2 [VDSL2]), the achievable data rates became sufficient to commercialize digital television (TV) services over Internet Protocol (IPTV).

At higher frequencies, phone lines are more prone to time-varying external influences such as impulse noise and crosstalk from other lines. Very recently, DSL technology has been further enhanced and now effectively copes with this crosstalk and impulse noise [6,7]. Time-varying crosstalk can be mitigated by appropriately configuring a noise margin or virtual noise. Protection against impulse noise is commonly provided by using interleaved Reed-Solomon codes.