Automatic log-off trigger of data link layer pass-through

A method for a remote unit to trigger a log-off of a data link layer pass-through application in a local unit, the method comprising:

• waiting for input data from the local unit through the data link layer;
• when data is received, determining if a session layer in the remote unit is active;
• if the session layer is active, processing the received data in the session layer;
• and
• if the session layer is inactive, aborting the data link layer pass-through application in the local unit.

A method for a remote modem to trigger a log-off of a data link layer pass-through application in a local modem, both the remote modem and the local modem having a session layer and a data link layer, the method comprising:

• waiting for input data from the local modem through the data link layer;
• when data is received, determining if the session layer in the remote modem is active as indicated by a state indicator;
• if the session layer is active, processing the received data in the remote modem session layer;
• and
• if the session layer is inactive, aborting the data link layer pass-through application in the local modem.

A data communications system comprising:

• a computing device that generates user data;
• a local unit comprising:
• a session layer that executes a user interface and a data pass-through application;
• and
• a data link layer that responds to the data pass-through application by passing the user data through the local unit to a communication link;
• and
• a remote unit coupled to the communication link, the remote unit comprising:
• a session layer that executes a user interface;
• and
• a data link layer that receives the user data and determines a status of the session layer, the data link layer transmitting a disconnect request to the local unit data link layer in response to an inactive status.

A data communications system comprising:

• a computer that generates user data in response to a user input;
• a local modem comprising:
• a session layer that executes a graphical user interface and a data pass-through application;
• and
• a data link layer that responds to the data passthrough application by passing the user data through the local modem to a communication link;
• and
• a remote modem coupled to the communication link, the remote modem comprising:
• a session layer that executes a graphical user interface;
• and
• a data link layer that receives the user data and determines a status of the session layer by checking a state indicator, the data link layer capable of transmitting a disconnect request to the local modem data link layer in response to an inactive status.

A communication device comprising:

• an operating system that executes processes in the communication device;
• a session layer that comprises the executed processes including a user interface;
• and
• a data link layer capable of detecting a status of the session layer and generating a disconnect request in response to an inactive indication of the status.

A modem comprising:

• modem circuitry that modulates user data to be transmitted and demodulates received data;
• memory that stores data for use by the modem;
• and
• a controller, coupled to the memory, that is capable of executing an operating system that operates a session layer comprising graphical user interface and a data passthrough application, the controller further executing a data link layer that receives a disconnect request from the modem circuitry such that the data link layer routes any further user data to the graphical user interface.

A modem comprising:

• modem circuitry that modulates user data to be transmitted and demodulates received data;
• memory that stores data for use by the modem;
• and
• a controller, coupled to the memory, that is capable of executing an operating system that operates a session layer comprising graphical user interface, the controller further executing a data link layer that generates a disconnect request in response to an inactive status indication of the session layer, the controller transmitting the disconnect request to the modem circuitry.