Packet data transmitting apparatus, and method therefor

Details Packet data transmitting apparatus, and method therefor Packet data transmitting apparatus, and method therefor

1998-03-11

2001-08-28

Olms, Douglas (Department: 2661)

Multiplex communications

Pathfinding or routing

Switching a message which includes an address header

C370S389000, C370S401000, C370S419000

Reexamination Certificate

active

06282203

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a packet data transmitting apparatus and a method therefor, in which packet data consisting of packets are transmitted to the destination by using a hardware router.
2. Description of the Prior Art
Insofar as methods of transmitting data are concerned, there are a line exchange method and a packet transmitting method.
The line exchange method is mostly used, for example, in the electronic switching method. In this method, communication lines are installed, so that the data would not be delayed but would be transmitted with real time.
However, in the line exchange method, the line is occupied for transmitting the data, and therefore, it happens that the lines cannot be effectively used. Further, the communication expense shows severe differences depending on the magnitude of the communication distance. Further, the communication becomes impossible if the other end has a different communication speed.
On the other hand, the packet method carries out the data transmission by dividing the data into packet units, and is used mostly in systems like the CDMA(code division multiple access) in which control signals and data are exchanged between the communicating parties.
The packet consists of a data unit formed in a predetermined length, and the address of the other communicating party.
In this packet transmitting method, when data are transmitted, a line does not have to be occupied, and therefore, the line can be used effectively. Further, the communication becomes possible even if the other party has a different communication speed.
FIG. 1
illustrates a conventional packet data transmitting apparatus.
As shown in
FIG. 1
, the conventional packet data transmitting apparatus includes: a serial/parallel converting section
100
for converting the incoming serial data into a parallel data; a central processing unit
101
for temporarily storing the output packet parallel data of the serial/parallel converting section
100
, and for detecting an address information so as to convert the logical address into a physical address;
a buffer
102
for storing the output parallel packet data from the central processing unit so as to output them in accordance with the FIFO (first in first out) method; a hardware router
103
for transmitting the output parallel packet data to the relevant destination; and another buffer
104
for storing the packet data transmitted from the hardware router
103
so as to output them in the FIFO method.
In the conventional packet data transmitting apparatus, the serial packet data which are received externally are converted into parallel packet data by the serial/parallel converting section
100
. Then, the central processing unit
101
receives the data to store them into the internal memory
101
A in a sequential manner.
The parallel packet data which have been stored in the internal memory
101
A are sequentially read by the central processing unit
101
so as to detect the address information from the packet data. Then the central processing unit
101
converts the logical address to a physical address before outputting it.
The parallel data which have been outputted from the central processing unit
101
are stored in the buffer
102
, and are outputted in the FIFO method.
The parallel output data which are outputted from the buffer
102
are inputted into the hardware router
103
, and are stored into the buffer
104
of the destination. Then they are outputted in the FIFO method to be transmitted to the destination.
In this conventional packet data transmitting apparatus, the central processing unit reads the destination address of the received data so as to transmit the packet data to the destination.
Therefore, in a system requiring multitasking, an over-load is imposed on the central processing unit, thereby lowering the operating performance. In the case where a large amount of packet data is inputted into the central processing unit, errors are liable to occur due to the over-load on the central processing unit.
Further, the central processing unit tackles one by one in detecting the address information of the packet data, and therefore, the peripheral circuits of the central processing unit becomes complicated.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantages of the conventional technique. Therefore it is the object of the present invention to provide a packet data transmitting apparatus and a method therefor, in which the destination address of the packet data is detected by using a hardware router, and the packet data are transmitted based on the detected destination address.
In achieving the above object, a hardware router designates respective nodes in a sequential manner to confirm the existence or absence of the packet data to be transmitted, and a destination address is detected from the packet data of the transmitting node so as to discriminate the receiving node.
Therefore, according to the present invention, even without an intervention of the central processing unit, a transmission path is provided for the packet data transmitting node and the receiving node, thereby making it possible to carry out a hardware type packet data communication.


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