Cisco WS-C3550-12G Switch Guide - Page 159

Description Specification Hardware tables and scalability MAC addresses Number of VLANS Spanning-tree instances Access control list (ACL) entries 128,000 4096 • RSTP: 512 • MSTP: 64 • 2000 ingress • 1000 egress Routing table Number of EtherChannels • 16,000 prefixes and 16000 host entries* • 8000 multicast routes* 64 (with vPC) Number of ports per 16 EtherChannel Power Buffers Boot flash memory Number of power supplies Power supply types Typical operating power 9 MB shared 2 GB 2 (redundant) • AC (forward and reversed airflow) • DC (forward and reversed airflow) • 172 Watts (with Twinax at 100% load;2 power supply units [PSUs]) • 174 Watts (with short-reach optics at 100% load; 2 PSUs) Cooling Maximum power 227 Watts Input voltage 100 to 240 VAC Frequency 50 to 60 Hz Power supply efficiency 89 to 91% at 220V Typical heat dissipation • 587 BTU/hr (16p with Twinax at 100% load; 2 PSU) • 594 BTU/hr (16p with SR4 optics at 100% load; 2 PSU) Maximum heat dissipation 775 BTU/hr • Forward and reversed airflow schemes • Forward airflow: Port-side exhaust (air enters through fan tray and power supplies and exits through ports); supported with AC and DC power supplies • Reversed airflow: Port-side intake (air enters through ports and exits through fan tray and power supplies); supported with AC power supply only • Single fan tray with redundant fans • Hot swappable (must swap within 1 minute) 157