This standard specifies portions of Clause 61 of IEEE Standard 802.3ah-2004@ Amendment to Carrier Sense Multiple Access with Collision Detection (CSMA/CD) access method and physical layer specification as a normative reference and identifies the requirements for multi-pair bonding in IEEE 802.3ah-2004 that are different in the United States. Further@ this standard specifies the requirements for extending the bonding methods in IEEE 802.3ah-2004 to xDSL technologies other than VDSL and SHDSL. The following are the objectives this standard: a. To provide support for operation of xDSL technologies on multiple pairs of voice grade twisted pair cable. b. To provide 100 Mb/s burst data rate at the Ethernet media independent interface using Rate Matching. c. To provide full duplex operation. d. To provide a communication channel with a mean BER at the ??/??service interface of less than 107.