Multiplex communications – Wide area network – Packet switching
Patent
1995-02-24
1996-07-02
Hsu, Alpus H.
Multiplex communications
Wide area network
Packet switching
370 84, 3701101, 370112, H04J 316, H04L 1252
Patent
active
055330223
ABSTRACT:
A switching system between two offices connected by plural digital lines and an outband channel. Each digital line has plural channels, and each channel has a corresponding basic bit rate and is able to multiplex plural sub-rate channels so as to accommodate sub-rate calls. When one of the offices requests the setting of a sub-rate call, a digital interface system designates to the other office, through the outband channel, a sub-rate channel to be used and attribute information concerning the sub-rate channel. If the designated sub-rate channel is not usable by the receiving office, a control unit at the receiving office selects a usable sub-rate channel and informs the originating office that the sub-rate channel is changed to the usable sub-rate channel.
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Hitachi , Ltd.
Hsu Alpus H.
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