Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1998-06-11
2001-09-11
Ton, Dang (Department: 2661)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S359000
Reexamination Certificate
active
06289018
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application for ATM SWITCHING SYSTEM SUPPORTING N-ISDN TRAFFIC AND METHOD FOR CONTROLLING THE SAME earlier filed in the Korean Industrial Property Office on the Jun. 11, 1997 and there duly assigned Serial No. 24034/1997.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ATM switching system, and in particular, to an ATM switching system capable of servicing N-ISDN traffic and a method for controlling the same.
2. Description of the Related Art
Since an ATM (Asynchronous Transfer Mode) technology was adopted as a principal technology for realizing B-ISDN (Broadband-Integrated Services Digital Network), various communication equipment employing the ATM technology have been put on the market. According to the state of the art, the ATM technology can service N-ISDN (Narrowband-ISDN) traffic through an ATM network. Though many efforts have been made to service the N-ISDN traffic using the ATM technique, it is not yet possible to provide the voice subscriber with a satisfactory service, since the ATM technique is different from the existing circuit switching (or line switching) technique in the data transfer mode. Therefore, in a transition period, the ATM switching system requires an additional function for servicing the N-ISDN traffic.
At present, many efforts have been made to provide voice service to the subscriber connected to a public switched telephone network (hereinafter referred to as a PSTN) by means of an interworking device disposed between the PSTN and the ATM network. However, in this case, a time delay problem and a lowered cell transfer efficiency problem (i.e., a lowered bandwidth efficiency problem) are caused, when N-ISDN traffic data output from the PSTN is assembled into an ATM cell.
The following patents each disclose features in common with the present invention but do not teach or suggest the specifically recited ATM switching system for supporting N-ISDN traffic and a method for controlling the same in accordance with the present invention: U.S. Pat. No. 5,375,118 to Rao et al., entitled Apparatus For Transmitting Data Between Two Parties Belonging To At Least One Narrow Band Integrated Services Digital Network, U.S. Pat. No. 5,623,491 to Skoog, entitled Device For Adapting narrowband Voice Traffic Of A Local Access Network To Allow Transmission Over A Broadband Asynchronous Transfer Mode Network, U.S. Pat. No. 5,608,447 to Farry et al, entitled Full Service Network, U.S. Pat. No. 5,638,364 to Sugita, entitled ATM-LAN With CLSF Processor And Simplified CLAD Units, U.S. Pat. No. 5,742,765 to Wong et al., entitled Combination Local ATM Segmentation And Reassembly And Physical Layer Device, U.S. Pat. No. 5,737,312 to Sasagawa, entitled Cell Assembly And Disassembly Apparatus In AN ATM Network, U.S. Pat. No. 5,610,921 to Christensen, entitled Scalable Architecture For Asynchronous Transfer Mode Segmentation And Reassembly, U.S. Pat. No. 5,541,926 to Saito et al, entitled A TM Cell Assembly And Disassembly Device With Enhanced Data Handling Flexibility, U.S. Pat. No. 5,390,175 to Hiller et al, entitled Inter-Cell Switching Unit For Narrow Band ATM Networks, U.S. Pat. No. 5,214,642 to Kunimoto et al., entitled ATM Switching System And Adaptation Processing Apparatus, U.S. Pat. No. 5,220,562 to Takada et al., entitled Bridge Apparatus And A Communication System Between Networks Using The Bridge Apparatus, U.S. Pat. No. 5,220,563 to Grenot et al., entitled Device For The Transmission By An Asynchronous Network, Notably An ATM Type Network, Of Signaling Data, Channel By Channel, Assembled In A Multiframe Transmitted Synchronously In Out-Of Band Mode, U.S. Pat. No. 5,280,476 to Kojima et al., entitled Communication Control System Using An Asynchronous Transfer Mode Network, U.S. Pat. No. 5,457,684 to Bharucha et al., entitled Delay-Less Signal Processing Arrangement For Use In An ATM Network, U.S. Pat. No. 5,483,527 to Doshi et al., entitled Terminal Adapter For Interfacing An A TM Network With A STM Network, and U.S. Pat. No. 5,436,899 to Fujino et al., entitled High Performance Digitally Multiplexed Transmission System.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an ATM switching system capable of handling both the STM traffic and the ATM traffic using a single switch.
It is another object of the present invention to provide an ATM switching system capable of handing both the STM traffic and the ATM traffic, in which interworking devices between the STM traffic and the ATM traffic are distributed to respective ports of an ATM switch so as to get rid of the bottleneck phenomenon.
It is still another object of the present invention to provide an ATM switching system capable of performing a routing operation using a single ATM switch.
It is further still another object of the present invention to provide an ATM switching system which is free from a time delay in transferring a cell, by assembling different voice data into the cell by a frame period.
It is yet another object of the present invention to provide an ATM switching system for multiplexing a plurality of calls to assemble them into the cells, so as to improve a cell bandwidth efficiency.
To achieve the above objects, there is provided an ATM switching system including a subscriber input module, a trunk input module, an ATM switch, a subscriber output module, and a trunk output module. The subscriber input module includes a 2B+D frame handler for splitting 2B+D channel data output from an N-ISDN subscriber into B-channel data and D-channel data, and multiplexing the split B- and D-channel data to corresponding highways; a first time switch module for sorting the channel data on the respective highways by time slots corresponding to destination time switch module numbers, and switching channel stream data grouped by destinations to the respective highways; and a first input CLAD for collecting voice data output from the time switch module by destinations to assemble an ATM cell. The trunk input module includes a frame handler for splitting frame data output from an N-ISDN trunk into B-channel data and D-channel data, and multiplexing the split B- and D-channel data to respective highways; a second time switch module for sorting the channel data on the respective highways by time slots corresponding to destination time switch module numbers, and switching channel stream data grouped by destinations to the respective highways; and a second input CLAD for collecting voice data output from the second time switch module by destinations to assemble an ATM cell. The ATM switch having input ports connected to the subscriber input module and the trunk input module and output ports connected to the subscriber output module and the trunk output module, self-routes the ATM cell input from the subscriber input module and the trunk input module to switch the ATM cell to a corresponding destination. The subscriber output module, having a same construction as that of the subscriber input module, handles, in reverse order, the ATM cell output from the ATM switch and outputs the handled ATM cell to another N-ISDN subscriber. The trunk output module, having a same construction as that of the trunk input module, handles, in reverse order, the ATM cell output from the ATM switch and outputs the handled ATM cell to another N-ISDN trunk.
REFERENCES:
patent: 4977556 (1990-12-01), Noguchi
patent: 5214642 (1993-05-01), Kunimoto et al.
patent: 5220562 (1993-06-01), Takada et al.
patent: 5220563 (1993-06-01), Grenot et al.
patent: 5280476 (1994-01-01), Kojima et al.
patent: 5375118 (1994-12-01), Rao et al.
patent: 5390175 (1995-02-01), Hiller et al.
patent: 5436899 (1995-07-01), Fujino et al.
patent: 5446731 (1995-08-01), Lee
patent: 5457684 (1995-10-01), Bharucha et al.
patent: 5483527 (1996-01-01), Doshi et al.
patent: 5537403 (1996-07-01), Cloonan et al.
patent: 5541926 (1996-07-01), Saito et al
Bushnell , Esq. Robert E.
Sam Phirin
Samsung Electronics Co,. Ltd.
Ton Dang
LandOfFree
ATM switching system supporting N-ISDN traffic and method... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with ATM switching system supporting N-ISDN traffic and method..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ATM switching system supporting N-ISDN traffic and method... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2510886