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Table 2 shows the Cisco Catalyst 2948 G-GE-TX Gigabit Ethernet Switch hardware requirements.
Table 2 Hardware
Description Specification
Performance • 20 Gbps maximum forwarding bandwidth at Layer 2 switching fabric
• Forwarding rate of 29.76 Mpps for 64-byte packets
• 64 MB DRAM and 16 MB Flash memory
• Configurable up to 16,000 MAC addresses
• Configurable maximum transmission unit (MTU) of up to 1522 bytes for bridging on
Gigabit Ethernet ports
Connectors and Cabling • 10BASE-T ports: RJ-45 connectors, 2-pair Category 3, 4, or 5 unshielded twisted-pair
(UTP) cabling
• 100BASE-TX ports: RJ-45 connectors, 2-pair Category 5 UTP cabling
• 1000BASE-T ports: RJ-45 connectors, 4-pair Category 5 UTP cabling
• 1000BASE-T SFP-based ports: RJ-45 connectors, 4-pair Category 5 UTP cabling
• 1000BASE-SX, -LX/LH, -ZX, and CWDM SFP-based ports: LC fiber connectors
(single-mode, or multimode fiber)
• 10/100 management port: RJ-45 connector
• Management console port: RJ-45-to-DB9 cable for PC connections
Power Connectors Customers can providepower to a switch by using eitherthe internal power supply or the
Cisco RPS 675. The connectors are located at the back of the switch.
Internal Power Supply Connector
• The internal power supply is an autoranging unit.
• The internal power supply supports input voltages between 100 and 240 VAC.
• Use the supplied AC power cord to connect the AC power connector to an AC power
outlet.
Cisco RPS Connector
• The connector offers connection for an optional Cisco RPS 675 that uses AC input and
supplies DC output to the switch.
• The connector offers a 675W RPS that supports up to six external network devices and
provides power to one failed device at a time.
• The connector automatically senses when the internal power supply of a connected
device fails and provides power to the failed device, preventing loss of network traffic.
• Only the Cisco RPS 675 (model PWR675-AC-RPS-N1=) should be attached to the
redundant power supply receptacle.
Indicators • Per-port link status LED
• System-status LEDs: system, power, and RPS
Dimensions (H x W x D) • 1.73 x 17.5 x 17 in. (4.39 x 44.5 x 43.1 cm)
Weight • 13 lb (5.9 kg)
Environmental Ranges • Operating temperature: 32 to 113 F (0 to 45 C)
• Storage temperature: –13 to 158 F (–25 to 70 C)
• Operating relative humidity: 10 to 85 percent (noncondensing)
• Operating altitude: Up to 10,000 ft (3049 m)
• Storage altitude: Up to 15,000 ft (4573 m)