Splitterless multicarrier modem

In a modem communicating data over a multiplicity of discrete subchannels, each characterized by a bit allocation parameter defining the allocation of bits over the corresponding subchannel for communication over said subchannel comprising:

• A. means for storing a first channel control table for allocating bits to said subchannels during a first communication condition, wherein said first table specifies the communications capabilities of said modem during normal operation;
• and
• B. means for storing a second channel control table for allocating bits to said subchannels during a second communication condition.

In a modem communicating data over a multiplicity of discrete subchannels, each characterized by a bit allocation parameter defining the allocation of bits over the corresponding subchannel for communication over said subchannel comprising:

• A. means for storing a first channel control table for allocating bits to said subchannels during a first communication condition;
• and
• B. means for storing a second channel control table for allocating bits to said subchannels during a second communication condition, wherein said second table specifies the communications capabilities of said modem during diminished operation.

In a modem communicating data over a multiplicity of discrete subchannels, each characterized by a bit allocation parameter defining the allocation of bits over the corresponding subchannel for communication over said subchannel comprising:

• A. means for storing a first channel control table for allocating bits to said subchannels during a first communication condition;
• and
• B. means for storing a second channel control table for allocating bits to said subchannels during a second communication condition, wherein said defined event includes signaling events comprising transitions between on-hook and off-hook conditions.

In a modem communicating data over a multiplicity of discrete subchannels, each characterized by a bit allocation parameter defining the allocation of bits over the corresponding subchannel for communication over said subchannel comprising:

• A. means for storing a first channel control table for allocating bits to said subchannels during a first communication condition;
• and
• B. means for storing a second channel control table for allocating bits to said subchannels during a second communication condition, wherein said first and second tables are determined during an initialization session in which the communication capabilities of said subchannels are determined.

In a modem communicating data over a multiplicity of discrete subchannels, each characterized by a bit allocation parameter defining the allocation of bits over the corresponding subchannel for communication over said subchannel, comprising:

• A. means for storing a first channel control table for allocating bits to said subchannels during a first communication condition;
• and
• B. means for storing a second channel control table for allocating bits to said subchannels during a second communication condition, wherein said second channel control table is determined responsive to a plurality of signaling events created by a corresponding plurality of event-generating sources, each defining a channel control table specific to the given source, and comprises a composite table formed by selecting, for each subchannel, the minimum bit allocation for the corresponding subchannel of the table associated with each of the plurality of sources.

In a modem communicating data over a multiplicity of discrete subchannels, each characterized by a bit allocation parameter defining the allocation of bits over the corresponding subchannel for communication over said subchannel, the improvement comprising:

• A. means for storing a first channel control table for allocating bits to said subchannels during a first communication condition;
• and
• B. means for storing a second channel control table for allocating bits to said subchannels during a second communication condition, wherein said second channel control table is selected from a plurality of tables determined responsive to a plurality of signaling events created by a corresponding plurality of event-generating sources, each defining a channel control table specific to the given source.

A modem for use in asymmetric digital subscriber line communications over a loop having both upstream and downstream communication channels formed from a plurality of subchannels, said loop adapted to carry both voice and data communications thereon, comprising:

• A. means for storing a first table defining data communications between said modem and a second modem connected to said loop during a first communication state;
• and
• B. means for storing a second table defining data communications between said modem and said second modem during a second communication state, specifies wherein said first table establishes a data rate greater than that of said second table.

A modem for use in asymmetric digital subscriber line communications over a loop having both upstream and downstream communication channels formed from a plurality of subchannels, said loop adapted to carry both voice and data communications thereon, comprising:

• A. means for storing a first table defining data communications between said modem and a second modem connected to said loop during a first communication state, wherein said first table is determined during an initialization process in the absence of a selected event;
• and
• B. means for storing a second table defining data communications between said modem and said second modem during a second communication state.

A method of transmitting data over a wire line through upstream and downstream channels, respectively, from first and second pluralities of discrete-frequency subchannels, comprising the steps of:

• A. storing at least first and second parameter sets defining data communications over said channels under at least two different communication conditions;
• B. selecting a parameter set for use in communications in accordance with the prevailing communication condition, wherein said selecting step includes the step of monitoring communications on said line and transmitting and selecting said parameter set in accordance with said monitoring.

A method of transmitting data over a wire line through upstream and downstream channels, respectively, from first and second pluralities of discrete-frequency subchanels, comprising the steps of:

• A. storing at least first and second parameter sets defining data communications over said channels under at least two different communication conditions;
• B. selecting a parameter set for use in communications in accordance with the prevailing communication condition, wherein said first parameter set defines communications over said line in the absence of a disturbance event and said second parameter set defines communications over said line in the presence of a disturbance event.

A method of transmitting data over a wire line through upstream and downstream channels, respectively, from first and second pluralities of discrete-frequency subchannels, comprising the steps of:

• A. storing at least first and second parameter sets defining data communications over said channels under at least two different communication conditions;
• B. selecting a parameter set for use in communications in accordance with the prevailing communication condition, wherein said parameter sets include at least one parameter set from the group comprising subchannel bit allocations and subchannel gains.

A method of transmitting data over a wire line through upstream and downstream channels, respectively, from first and second pluralities of discrete-frequency subchannels, comprising the steps of:

• A. storing at least first and second parameter sets defining data communications over said channels under at least two different communication conditions;
• B. selecting a parameter set for use in communications in accordance with the prevailing communication condition, wherein said parameter sets include at least one parameter set from the group comprising subchannel frequency domain coefficients, time domain coefficients, and echo cancellation coefficients.