Auxiliary Overhead Channel

Auxiliary Overhead Channel

The Auxiliary Overhead Channel (AOC) is a control sub-channel used when transmitting digital sound, to transmit control information which is then interpreted by the receiver.

The ADSL bit swap process also makes use of an 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.

References

* http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel3/3864/11281/00512347.pdf?temp=x IEEE -login required
* http://www.freepatentsonline.com/EP1553743.html Freepatents on line
* http://www.patentstorm.us/patents/5838799.html Patent storm


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