OPERATIONAL OVERVIEW
The MUSIC Epoch MultiLayer Switch Chip for a Layer 3/4 switch performs all of the functions necessary to route IPv4, IPX and IP Multicast packets at wire-speed; to recognize and categorize traffic flows, optionally using IETF Differentiated Services (DS); and to queue each flow independently in an associated SDRAM. Upon transmission, DS information may be remarked. The Epoch handles up to 16 ports; one port is required for the processor to allow it to act as a packet source or destination.

DISTINCTIVE CHARACTERISTICS
• Wire speed Layer 3/Layer 4 switching for IPv4, IP Multicast, and IPX
• Header manipulation and checksum recalculation at wire speeds
• Support for Layer 3 CIDR (best prefix match)
• Per Flow and per IP or IPX address filtering options
• Behavior Aggregate Classification (BAC) and Microflow static/dynamic flow classification
• 64K default priority assignments with processor override for specific flows
• Eight levels of Weighted RR or eight levels of priority
• L3 to L2 support for IP to MAC address translation
• Destination and/or Source Port monitoring
• Generic 32 bit processor interface
• 66 MHz clock
• 3.3 Volt power with 5 Volt tolerant I/O pins
• IEEE 1149.1 (JTAG) boundary scan logic
• 456 PBGA Package

FEATURES AND BENEFITS
• MultiMedia-ready integrated switch on a chip
• Process Layer 3 and Layer 4 of the IP stack
• 1.4 Million packets/flow classifications per second; full Layer 4 flow recognition
• Up to 16 ports supported with powerful flexible built-in parsing function
• QoS Support for VoIP and other MultiMedia flows
• Differentiated Services per port (DS)
• Eight queues per output port enabling efficient MultiMedia integration of voice (VoIP), video, and data
• Two scheduling algorithms selectable on a per port basis.
• IPv6 and other protocols supported through processor interface
• No Head-of-line blocking
• Layer 2 switch-through support at wire speed
• Firewall assist on a per packet or per flow basis
• Flow aging support

APPLICATIONS
• WAN edge routers
• MultiService platforms
• RAS platforms
• Group Switch/Router
• DSLAMs
• LAN PBX core