Alcatel Carrier Internetworking Solutions 8800 User Manual

Nantucket ASIC

OmniSwitch Troubleshooting Guide

page -17

The Nantucket ASICs have the following:

• Support for 8 and 16 Coronados only.

• No dynamic queue numbering for each NI slot.

• Fixed eight Nantuckets per Fabric board.

• Maximum of one redundant Fabric board.

The Nantucket software is arranged as:

• Nantucket operational software resides on the CMM.

• Nantucket operational software runs on the UltraSPARC IIe on the CMM.

• All accesses to Nantucket registers is through the PCI bridge and over the Bbus bridges.

• Minimum user interface software is provided for configuring and statusing the Nantucket ASICs.

• Minimum SNMP software is provided for configuring and statusing the Nantucket ASICs.

• Nantucket Fabric consists of eight Nantucket ASICs for the primary Fabric in OS-7800 and four 

Nantucket ASICs for the primary Fabric in OS-7700.

• Nantucket Fabric consists of eight/four Nantucket ASICs for the redundant Fabric, when running with 

a redundant CMM.

• Nantucket uses six SRAM memories, each SRAM is 32 bits wide by 11264 words deep.

• Nantucket has a point to point interface to all Coronados running at 500MHz.

• No packet processing on Nantucket

• Provides very little buffering

• Supports 512 per-port queues

• Supports 1 per-Coronado broadcast queue and 1 intercommunication queue.

• Supports flow control/pay generation for Coronado bandwidth control

• Supports VLAN spanning tree masks

Nantucket supports the following messages:

• Ingress packets w/header

• Egress packets w/header

• Flow control messages

• Bandwidth management control messages “pay.”