FEATURES
• Sixteen Gbit/s, protocol-independent switching matrix expandable to 32 Gbit/s.
• Provides eight gigabit, full-duplex EXACT™ Bus ports that each support an EXACT switch port controller.
• Provides non-blocking connection between eight EXACT Bus (Ethernet Switching, Access, Control, and Termination) rings.
• Supports non-blocking connections between sixteen EXACT Bus rings to provide a system bandwidth of 32 Gbit/s using four PM3390 devices.
• Destination lookup table maps logical EXACT ports to physical PM3390 ports. Destination lookup table can be dynamically allocated.
• Provides visibility into internal dataflow to allow external flow control in systems that do not use the EXACT Bus link protocol.
• Each chip supports the EXACT Bus Protocol, which is a 10-bit, unidirectional insertion ring running at 125 MHz or 135 MHz.
• EXACT Bus ports allow simple box-tobox, card-to-card, or chip-to-chip interconnect.
• 8B/10B EXACT Bus encoding is compatible with Common Serialization (SERDES) devices to allow serial extension using coax or twinax cable.
• Management interface connects to an off-chip microprocessor for access to internal control registers.

APPLICATIONS
• High Bandwidth (16 to 32 Gbit/s) Ethernet Switches that Support Combinations of 10/100/1000 Ports.
• Multiprotocol Switch (Ethernet, ATM, Packet Over SONET, FDDI, and TR)
• Modular Ethernet Switches.
• Fixed-configuration Ethernet Switches.