Cisco WS-C4900M Manual page 157

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