The DS31256 is a 256-channel HDLC controller that can handle up to 60 T1 or 64 E1 data streams or two T3 data streams. Each of the 16 physical ports can handle one, two, or four T1 or E1 data streams. The DS31256 is composed of the following blocks: Layer 1, HDLC processing, FIFO, DMA, PCI bus, and local bus.
There are 16 HDLC engines (one for each port) that are each capable of operating at speeds up to 8.192Mbps in channelized mode and up to 10Mbps in unchannelized mode. The DS31256 also has three fast HDLC engines that only reside on Ports 0, 1, and 2. They are capable of operating at speeds up to 52Mbps.
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