Highway expansion apparatus for key telephone system and operation method thereof
AssigneeLG Electronics Inc.
InventorsGab-Young Lee, Won-Young Lee
Life of this patent
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Abstract
In a highway expansion apparatus for a key telephone system and an operation method thereof, by connecting a MPB (main process board) of a master system with a system LMU (ink module unit) of an expansion system through a cable and generating a highway to be provided from the MPB to the expansion system, a highway of the key telephone system can be expanded.
Claims21
A highway expansion apparatus for a key telephone system, comprising:
- a master system including a main process board (MPB);
- an expansion system including a system link module unit (LMU);
- and
- connection means for connecting the MPB with the system LMU.
An expansion apparatus for a key telephone system, comprising:
- an edge connector that connects to a main process board slot of a master system;
- a control unit that controls operations of the key telephone system,
- a switching unit having a plurality of switches co switch a pulse code modulation (PCM) voice signal;
- plural cone generators each coupled to a corresponding one of the switches, respectively, to provide tones;
- and
- a system connector that connects to a system link module unit (LMU) of an expansion system.
An operation method of a highway expansion apparatus for a key telephone system, comprising:
- determining a transmission switch by using an output port number of a highway;
- determining a reception switch by using an input port number of the highway;
- and
- transmitting the highway through a route of a selected reception and transmission switches.
The method of 14, wherein the route comprises a selected one among a plurality of reception switches and a selected one among a plurality of transition switches according to prescribed criteria.
A method of operating a key telephone system, comprising;
- processing input signals by a master system reception switch and an expansion system reception switch, respectively;
- first-switching an output signal of the master system reception switch and an output signal of the expansion system reception switch and selectively transmitting the signals to each of a master system transmission switch and an expansion system transmission switch;
- and
- second-switching output signals of the master system transmission switch and the expansion system transmission switch.
In an expansion apparatus for a key telephone system having a master unit and a slave unit, a method, comprising:
- judging a highway is outputted through a transmission switch of a master unit when an output port of the highway is one of a first prescribed range of values;
- judging a highway is outputted through a transmission switch of a slave unit when an output port of the highway is one of a second prescribed range of values greater than the first prescribed range;
- determining a reception switch according to an input port number and a transmission switch of the highway;
- and
- transmitting the highway through a connection route between a corresponding reception switch and a corresponding transmission switch.
Dependencies are inferred from the claim text.