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The known ADSL bit swap process makes use of the overhead control channel or so called AOC channel (Auxiliary Overhead Channel) to convey the bit swap request and bit swap acknowledge messages between the multi-carrier transceivers whose bit and power allocations will be updated as a result of the changing noise or line conditions.
The AOC bytes are carried as overhead bytes in the ADSL frame structure. As such, they are also modulated on the carriers and therefore also vulnerable to changing noise and/or line conditions. If the noise is severe on the carriers that convey the AOC bytes, the bitswap commands themselves may be impaired. In that case, the multi-carrier transceiver will be unable to successfully complete online reconfiguration. Source: http://www.freepatentsonline.com/EP1553743.html
