Abstract: A system and method are provided for special signaling with customer premises equipment. The system includes loop termination equipment coupled to a local loop and comprising a signal generator. The system also includes customer premises equipment coupled to the local loop. The customer premises equipment and loop termination equipment are operable to communicate across a communication link established on the local loop. The loop termination equipment is further operable to control characteristics of a signal generated by the signal generator and to provide the signal to the customer premises equipment as special signaling where the signal has a frequency that does not substantially interfere with voice traffic on the local loop. The special signaling can be used to implement enhanced service to the customer premises including busy signal, queued data request processing, push data and telephony services.

Abstract: A communications system includes an xDSL communications device coupled to customer premises equipment via an xDSL link. The communications device trains the link, determines an available bandwidth for downstream communications, allocates a portion of the available bandwidth based on provisioned parameters of the link, and adjusts operational characteristics of a line driver to reduce the power consumption of the communications device.

Abstract: A system and method are provided for special signaling with customer premises equipment. The system includes loop termination equipment coupled to a local loop and comprising a signal generator. The system also includes customer premises equipment coupled to the local loop. The customer premises equipment and loop termination equipment are operable to communicate across a communication link established on the local loop. The loop termination equipment is further operable to control characteristics of a signal generated by the signal generator and to provide the signal to the customer premises equipment as special signaling where the signal has a frequency that does not substantially interfere with voice traffic on the local loop. The special signaling can be used to implement enhanced service to the customer premises including busy signal, queued data request processing, push data and telephony services.

Abstract: A D4 channel bank data bus monitoring scheme automatically determines if a channel unit connector slot is occupied, without having to gain physical access to the interior of the channel bank cabinet and inspect the channel bank's backplane slot positions. To this end, for a respective channel unit connector slot the channel bank's transmit data bus, which is initially pulled high via a pull-up resistor, is monitored for an all `1`s state. If the data on the bus is not all `1`s, then it is inferred that a channel unit is installed. If an all `1`s state is not detected, then, during the next time slot for that channel unit, the bus is decoupled from the pull-up resistor and coupled instead to a `soft` pull-down resistor. If the data on the bus is now all `0`s, it is inferred that the previously read all `1`s condition was due to the fact that no channel unit is installed, and the channel unit connector slot is declared as empty.

Abstract: A framing pattern detector comprises a multi-stage input store, an intermediate logic operator, and a decoder. As the serial bit stream is clocked through the input store, the intermediate logic operator subjects sequentially spaced apart bits to a prescribed logic function, and transforms these bits into a transformed bit pattern having a length less than that of the framing pattern. The decoder compares the transformed bit pattern with cyclically rotated versions of a prescribed multi-bit framing pattern template. In response to a match between the transformed pattern with any of the cyclically rotated versions of the template, the decoder identifies the framing pattern. If the decoder fails to detect a match, the clocking of the serial bit stream is adjusted until the decoder identifies the framing pattern.