Browse Prior Art Database

RELIABLE MULTICASTING IN WIDE AREA ISDN

IP.com Disclosure Number: IPCOM000007576D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2002-Apr-08
Document File: 2 page(s) / 119K

Publishing Venue

Motorola

Related People

Jingsheng Fu: AUTHOR

Abstract

Multicasting is not well addressed in wide area network. The present invention provides a method and apparatus for reliable multicast in wide area ISDN. The invention uses D channels to send data to set up circular connections to all members in a multicast group, then, uses B channels to send data to all members in a multicast group. Further, it uses D channels to acknowledge data transmissions, and reporting problems back to the sender.

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;Technical Developments

RELIABLE MULTICASTING IN WIDE ARE+ ISDN

by Jingsheng Fu

INTRODUCTION

  Multicasting is not well addressed in wide area network. The present invention provides a method and apparatus for reliable multicast in wide area ISDN. The invention uses D channels to send data to set up circular connections to all members in a multicast group, then, uses B channels to send data to all members in a multicast group. Further, it uses D channels to acknowledge data transmissions, and reporting problems back to the sender.

OPERATION OVERVIEW

  Fig. 1 shows that multicasting in wide area ISDN is supported by ISDN Terminal Equipment, ISDN LAN Rings, ISDN dial-up routers. ISDN switches. Tl/El and wires are not shown here.

  As Fig. 1 illustrates, an ISDN TEl in the ISDN LAN ring sends data to all members in ISDN LAN ring 2,3,4 in wide area. An ISDN TE is connected to an ISDN LAN ring hub. An ISDN LAN ring hub is connected to an ISDN dial-up router. An ISDN dial-up router is connected to an ISDN switch. ISDN switches are connected together by telephone carriers, public or private networks.

SET UP CONNECTIONS

  prior to the start of sending data, connection to all members in a multicast group will be set up by using D channel. A sender (e.g., ISDN TE 1 in ISDN LAN Ring 1) will send multicasting request to an ISDN ring hub via D channel. Upon receiving the request from the sender, the ISDN LAN hub (e.g., ISDN LAN Ring l's hub) will examine the addresses of receivers. For receivers in the same LAN, the hub will send a signal via D channel to them, let them prepare for receiving data from the sender. The hub will also set up circular connections for sending data to receivers in the LAN in B channels.

  For receivers outside the LAN, the hub will resend the request to an iISDN dial-up router (e.g., ISDN dial-up router l).; The router will examine the addresses of the receivers. For receivers under the same router, the router will send the request to hubs of all targeting ISDN LANs. In turn, the hubs will send signals to receivers in their own LANs via D channels, set up connections for sending data in B channels.

  For receivers outside the range of the router, the router (e.g., ISDN dial-up router 1) will send the request to an ISDN switch (e.g., ISDN SWITCH
1). The switch will look up which ISDN LAN rings the receivers connect to (e.g., ISDN TE 3 is con- nected to ISDN LAN ring 2), which ISDN dial-up routers the ISDN LAN rings connect to (e.g., ISDN LAN Ring 2 is connected to ISDN Dial-up Router
2), which ISDN switches...