| 摘要 |
PROBLEM TO BE SOLVED: To permit a service while using the channel of an integrated service digital network(ISDN) by transmitting a packet through a bearer channel when the packet to be transmitted through a data(D) channel(B) belongs to the stream of a format non-resistant to delay to meet. SOLUTION: The function of a link layer execution element formats an IP packet for transmission through two B channels to the D channel and an internet protocol packet can be reconstituted by switching due to a telephone exchange 105 and an access server 103. With this function, enery packet to delay a packet transmitted from the B channel is removed from the D channel. The packet is separated based on the steam, to which that packet belongs, and the packet belonging to the stream of the form other than a specified form is designated to be transmitted from the D channel so that the packet belonging to the stream of the specified form can be transmitted not from the D channel but only from the B channel.
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