Telephonic communications – Plural exchange network or interconnection
Reexamination Certificate
1998-07-08
2001-10-16
Smith, Creighton (Department: 2742)
Telephonic communications
Plural exchange network or interconnection
C379S220010
Reexamination Certificate
active
06304650
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a call processing signal routing system in a local exchange system, and more particularly, to a call processing signal routing system for transferring a call processing signal in a signaling system, such as ISDN or No. 7 common signaling system.
(b) Description of the Related Art
Conventional signaling systems, such as ISDN or No. 7 common signaling system, generally comprises a central processor in a local exchange system of a routing station for receiving a call processing message.
FIG. 1
is a schematic block diagram for showing the configuration of a local exchange system of a routing station and the signal flow of the call processing signal therein.
The local exchange system comprises a time-division switch
11
, a central processor
12
, trunks
13
and
15
, and common signal equipment (CSE)
14
and
16
. Trunks
13
and
15
are connected to respective nodes corresponding to other local exchange systems through transmission lines
20
and
21
. The common signal equipment
14
or
16
controls data in the data link layer, and the central processor
12
controls data in the network layer. When a call processing message arrives through transmission line
20
, for example, common signal equipment
14
extracts the call processing message from trunk
13
to transfer the same to central processor
12
.
Central processor
12
operates by itself for routing the received signal if the message is addressed to the own local exchange system. On the other hand, if the message is addressed to another node or another local exchange system, the message is transferred through common signal equipment
16
to corresponding trunk
15
, and then to the specified node outside the station. In this system, all the routing processing in the exchange system is performed by the central processor
12
, which causes a heavy load to the central processor
12
.
Some proposals are made to alleviate the load of the central processor, wherein the common signal equipment has a function for processing signal routing by itself to alleviate the load of the central processor. In this system, each common signal equipment stores routing information (address) for the own station, and judges whether or not the routing information in the received signal coincides with the stored routing information.
If it is judged that the received routing information coincides with the stored routing information in the common signal equipment, then the received data is transferred to the central processor for processing the received data in the own station. If not, the received routing information is transferred to the central processor for further routing processing to thereby select the transmission line for the message. By using the proposed system, the data transfer between common signal equipment and the central processor is reduced to some extent to thereby alleviate the load of the central processor.
In the proposed system, however, if the received routing information does not coincide with the stored routing information, the central processor further operates for routing processing, resulting in limited load alleviation of the central processor, with limited reduction of the routing processing time.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a call processing signal routing system in a local exchange system of a routing station, which is capable of alleviating the load of central processor in the local exchange system and reducing the routing processing time.
The present invention provides a local exchange system comprising a plurality of trunks connected to respective nodes outside the exchange system for receiving a signal in an original data format including a destination address, a plurality of common signal handlers, disposed for respective the trunks, for converting a received signal received through a corresponding one of the trunks into local area network data, a central processor for controlling operations of the local exchange system, and a local area network for coupling the common signal handlers and the central processor together for transmitting the local area network data therebetween, the central processor receiving and processing the local area network data if the destination address is directed to the local exchange system, each of the common signal handlers converting the local area network data into the original data format for transmission through a corresponding one of the trunks if the destination address is directed to a corresponding one of the nodes.
In accordance with the local exchange system of the present invention, the routing processing in the local exchange system can be conducted by using the local area network so that the load of the central processor is alleviated and the routing processing can be performed with reduced time.
The above and other objects, features and advantages of the present invention will be more apparent from the following description, referring to the accompanying drawings.
REFERENCES:
patent: 5583920 (1996-12-01), Wheeler, Jr.
patent: 2-291753 (1990-12-01), None
patent: 4-100440 (1992-04-01), None
patent: 4-291875 (1992-10-01), None
patent: 5-95427 (1993-04-01), None
patent: 6-284184 (1994-10-01), None
patent: 6-338956 (1994-12-01), None
Foley & Lardner
NEC Corporation
Smith Creighton
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