Abstract: A system and method for performing power management in a communication system without losing data is disclosed. The G.Lite system is an exemplary system suitable for implementing the present invention because it includes at least one operational state and an idle state in which no data is transmitted. The G.Lite standard defines ATU states. The defined states are full on state L0, low power state L1 and idle state L3. In L0 state, the ADSL link is fully operational at full data rate. In L1 state, the ADSL link is fully operational at a lower data rate. In L3 state, no signal is transmitted. Because no signal is transmitted, no idle cells are transmitted. This will result in losing the cell delineation and ATM link connectivity. Therefore, when data is received for an ATU in L3 state, data cells may be lost.

Abstract: A communication system implements a system for reducing the processing burden associated with detecting an escape sequence in a set of data. The quantity of data contained within the modem's data buffer is intermittently compared to a threshold. While the quantity of data remains above a selected threshold, the data is not checked for an escape sequence. If the quantity of data falls below the threshold, the modem initiates an escape sequence detection procedure. Because the data source waits for a confirmation signal from the modem after sending the escape sequence, additional data will not be received in the data buffer. Thus, the escape sequence is typically among the most recently received data in the data buffer. As the modem processes the data in the buffer, the quantity falls below the threshold, activating the escape sequence detection procedure.

Abstract: A intelligent network interface network port (INIP) is provided that enables a visiting computer to be connected to a local area network (LAN), even though the LAN is not configured to support the visiting computer. Upon detecting one of several specific types of messages, the INIP modifies the message, retransmits the modified message and notifies the visiting computer that the INIP is the appropriate target for the message, thus acting as a relay point between the visiting computer and other devices both on the LAN and accessible through it. This enables the visiting computer to transparently connect to a LAN that is not configured to support it.

Abstract: A digital subscriber line (DSL) communication system that utilizes the high frequency band of a standard telephone line does not require the use of a plain old telephone service (POTS) splitter in the resident's home, which provided isolation between the POTS frequency band (0 to 4 kHz) and the DSL frequency band. Digital signal processing techniques are utilized to adapt to varying subscriber line conditions due to POTS telephone equipment. The digital signal processing techniques eliminate the need for a splitter by reducing susceptibility to distortion due to varying subscriber line characteristics. The digital subscriber line modem utilizes constant envelope modulated signals and frequency division multiplexing, where the constant envelope modulations lessens the intermodulation distortion products due to DSL signals that are transmitted by the modem and which may result in audible noise at the POTS telephone equipment due to non-linearities of the POTS telephone equipment.

Abstract: A digital subscriber line (DSL) communication system that utilizes the high frequency band of a standard telephone line does not require the use of a plain old telephone service (POTS) splitter in the resident's home, which provided isolation between the POTS frequency band (0 to 4 kHz) and the DSL frequency band. A digital subscriber line modem utilizes either constant envelope modulation or quadrature amplitude modulation for outputting DSL signals upstream to a central office. When a telephone in the resident's home is detected as being off-hook, then the constant envelope modulation is used by the DSL modem in order to lessen the intermodulation product distortion that results in audible noise heard by a user of the telephone. When the telephone is on-hook, then another type of modulation, such as QAM, is used to maximize the upstream data rate capability in the DSL frequency band, since any noise generated by the QAM is not a problem due to the non-use of the POTS frequency band.

Abstract: A synchronous protocol data formatter handles all 24-32 channels of a so-called primary rate version of a digital multiplexed interface or ISDN Primary Rates Interface for a communication system. The formatter relieves the host computer of the local area network of some highly specialized tasks, and, at the same time, provides the following augmented capabilities, which exceed those required by the C.C.I.T.T. standard, I.431:1. dynamic channel bandwidth allocation can assign arbitrary (even non-adjacent) time slots to create a super channel;2. a circular interrupt-queue in a shared memory enables the formatter and the host computer of the local area network to interact efficiently in updating and responding to changing conditions; and3. cyclical redundancy codes can be used on a more flexible basis than theretofore, e.g., can be generated upon only address and control fields for digitized voice signals, or, in a relay mode, can substitute an existing cyclical redundancy code to guard against memory errors.