ABSTRACT
Abstract Loop bonding is a method by which carriers can use two or more copper pairs to the customer to increase the throughput to an end user. Most traditional Digital Suscriber Line (DSL) services have been based on single pair technologies (e.g., residential asymmetric DSL [ADSL]) or
two pair technologies (e.g., High Bit-Rate DSL4 [HDSL4]), and have been relatively rigid in their deployment options. Loop bonding allows multiple pairs to be used together in a very dynamic, flexible manner to achieve more bandwidth to the subscriber. These techniques are being applied for residential triple-play services as well as high-speed symmetric business services. Loop bonding applications have focused on supporting a particular type of payload, for example, ATM (Asynchronous Transfer Mode) or Ethernet, and offer very efficient mechanisms for using multiple pairs for bandwidth and resiliency improvements. This chapter discusses loop bonding technologies for supporting both ATM and Ethernet, and shows how these techniques are being used by carriers for a wide variety of applications.
