Patent ID: 6618400
Filing Date: 2003-09-09
Classification: H04L,H04Q

Abstract:
An ISDN line selecting method of securing a backup line of a repeater line between connection nodes by connecting the connection nodes using an ISDN line being an integrated services digital network in which a bulk transfer of a plurality of B channels is performed to secure a required bandwidth, the bulk transfer by a pilot selection function where a setup message includes the pilot number of a destination apparatus and a number of B channels to be secured, comprising:selecting an ISDN line for backup in which a bulk transfer of a plurality of B channels is to be performed, out of a plurality of ISDN lines installed between connection node apparatuses by a the pilot selection function on an ISDN switching network side where the ISDN lines are switched; and selecting the ISDN line for backup, in which the bulk transfer of the plurality of B channels is performed, by exchanging a line number of the ISDN line to be selected, between the connection node apparatuses as user-user information in a D channel message of the ISDN line when the ISDN line is selected out of the plurality of ISDN lines installed between the connection node apparatuses.