System for interfacing numerous ISDN data connecting to a data network through the telephone network
First Claim
1. A system providing a connection interface between a digital circuit and a data network, comprising:
- a first and second extended time slot interchange units capable of transmitting and receiving data signals;
at least one extended time multiplexed switch capable of routing the data signals between the first and second extended time slot interchange units;
a data network interface connected between the second extended time slot interchange unit and the data network, having at least two PCM bus interfaces providing the duplex capabilities of the extended time slot unit and capable of receiving ATM packets;
the data network interface capable of translating ISDN signals into ATM packets and ATM packets into the ISDN signals, extracting control information from the ISDN signals and the ATM packets and responding to the control information; and
where the data network interface contains an idle code extract/insert circuit capable of scanning packet data streams for idle code and removing the idle code.
4 Assignments
0 Petitions
Accused Products
Abstract
A system for providing low cost data connections directly to a long distance switch in order to connect a plurality of ISDN-based data connections to a data network such as the Internet. A line card of this invention connects directly to a time slot interchange unit of a digital switch and receives ISDN data and control information, extracts the control information and sets up channels through to the data network, and provides ATM segmentation reassembly and header routing information in both directions. This system also provides policing and traffic shaping control for each ISDN connection and traffic control so that a particular ISDN connection does not overload the resources of the line card. The line card of this invention also provides ATM physical layer processing SONET encapsulation, and SONET optical interfaces to a router on the Internet. In this manner, numerous ISDN connections may be made inexpensively by using fewer ISDN modems and channel banks, and lessen the load on local switching systems.
46 Citations
11 Claims
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1. A system providing a connection interface between a digital circuit and a data network, comprising:
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a first and second extended time slot interchange units capable of transmitting and receiving data signals; at least one extended time multiplexed switch capable of routing the data signals between the first and second extended time slot interchange units; a data network interface connected between the second extended time slot interchange unit and the data network, having at least two PCM bus interfaces providing the duplex capabilities of the extended time slot unit and capable of receiving ATM packets; the data network interface capable of translating ISDN signals into ATM packets and ATM packets into the ISDN signals, extracting control information from the ISDN signals and the ATM packets and responding to the control information; and where the data network interface contains an idle code extract/insert circuit capable of scanning packet data streams for idle code and removing the idle code.
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2. A telecommunications switch interface that provides a data connection between a telecommunications network that transmits data in a first format and a data network that transmits data in a second format, said telecommunications switch having a time slot interchange connected to the telecommunications network, said interface comprising:
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a time slot interchange interface connected to said time slot interchange; a buffer for converting data between said first format and said second format connected to the time slot interchange interface; a processor connected to the buffer and the telecommunications switch for receiving control messages from the telecommunications network and controlling the system according to the control messages; and a data network interface connected to the buffer and the data network for conveying data between the data network and the buffer. - View Dependent Claims (3, 4, 5, 6, 7)
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8. A method for setting up a data connection between an integrated services digital network (ISDN) device and a data network through a telephone network, the telephone network including a digital switching system having an extended time slot interchange unit, the method comprising the steps of:
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the ISDN device requesting a connection via a D channel message; the digital switching system recognizing the D channel message and sending the message through the extended time slot interchange unit to the bulk ISDN line card; a bulk ISDN line card setting up a data connection to the data network responsive to the D channel message; the bulk ISDN line card receiving data from the telephone network, translating the data from the telephone network to the data network, and sending the data to the data network, the bulk ISDN line card receiving data from the data network, translating the data from the data network format to the data network format, and sending the data through the digital switch to the ISDN device; and the D channel message includes a request for bandwidth, determining whether the requested bandwidth is available, if the bandwidth is available, setting up a connection for the requested bandwidth, and if the requested bandwidth is not available, negotiating with the ISDN device for an available bandwidth. - View Dependent Claims (9, 10, 11)
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Specification