A network hub and Asynchronous Transfer Mode (ATM) translator system (5) for use in a Local Area Network (LAN)-based communications system is disclosed. The network hub and ATM translator system (5) includes a host controller (10) that serves as the LAN hub, and which interfaces with a translator card (15) which includes a segmentation and reassembly device (12) in connection with SONET receive/transmit circuitry (20) that communicates with a transceiver (22) to transmit and receive ATM packet cells over a communications facility (FO). The translator card (15) also includes a scheduler (14) that includes a heap sort state machine (36) which maintains a sorted list of entries, in a heap fashion, in on-chip parameter memory (44) and off-chip parameter memory (18). The entries include, for each ATM channel, a channel identifier and a timestamp that indicates the time at which the next cell for the channel will be due for transmission. A due comparator (40) compares the timestamp of the root value in the heap (i.e., the channel with the next due cell) to a global time generated by a reference timer (38), and indicates to a source behavior processor (24) in the scheduler (14) that a cell is due for transmission. The scheduler than issues a transmit credit for the cell, and communicates this event with the SAR device (12) to effect the transmission as appropriate.
Please note there is up to 60 days of latency in this Status indicator for certain status conditions. You can obtain up-to-date Status indicator readings by ordering PAIR for the file.
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