Multiplex communications – Wide area network – Packet switching
Patent
1989-06-16
1992-06-23
Fleming, Michael R.
Multiplex communications
Wide area network
Packet switching
3701101, 36424294, 3642513, G06F 702, H03K 522, H08J 302
Patent
active
051250829
ABSTRACT:
In a management system for managing a plurality of terminal endpoint identifiers which are to be assigned to terminal equipment units, an up-down counter is selectively operable in a count-up mode and a count-down mode to count the number of the terminal equipment units which are currently practically connected to the management system and to produce a count signal and to which the terminal endpoint identifiers are assigned, respectively. A read-only memory memorizes a first threshold value and a second threshold value greater than the first threshold value. A comparator compares the count signal with the first threshold value to produce a coincidence signal when the count signal is coincident with the first threshold value. On production of the coincidence signal, the terminal equipments to which the terminal endpoint identifiers are assigned are monitored by a central processing unit to judge whether or not the terminal equipments in question are actually connected to the management system. The first threshold value is changed to the second threshold value under control of a central processing unit in response to the coincidence signal.
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Fleming Michael R.
NEC Corporation
Sheikh Ayaz R.
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