6 Cisco Product Catalog, June, 2002
Table 21-131: Power Specifications for Cisco Catalyst 2950 Series Intelligent Ethernet Switches
Connectors and Cabling 10BaseT ports: RJ-45 connectors, two-pair Category 3, 4, or 5 unshielded twisted-pair (UTP) cabling
100BaseTX ports: RJ-45 connectors; two-pair Category 5 UTP cabling
1000BaseT ports: RJ-45 connectors; two-pair Category 5 UTP cabling
1000BaseSX, -LX/LH, -ZX GBIC-based ports: SC fiber connectors, single-mode or multimode fiber
Cisco GigaStack GBIC ports: copper-based Cisco GigaStack cabling
100BaseFX ports: MT-RJ connectors, 50/125 or 62.5/125 micron multi-mode fiber-optic cabling
Management console port: 8-pin RJ-45 connector, RJ-45-to-RJ-45 rollover cable with RJ-45-to-DB9 adapter for PC
connections. For terminal connections, use RJ-45-to-DB25 female DTE adapter (can be ordered separately from Cisco. Part
Number: ACS-DSBUSYN=)
MT-RJ Patch Cables for
Catalyst 2950C-24 Switch
1-meter, MT-RJ-to-SC multimode cable, CAB-MTRJ-SC-MM-1M
3-meter, MT-RJ-to-SC multimode cable, CAB-MTRJ-SC-MM-3M
5-meter, MT-RJ-to-SC multimode cable, CAB-MTRJ-SC-MM-5M1-meter, MT-RJ-to-ST multimode cable, CAB-MTRJ-ST-
MM-1M
3-meter, MT-RJ-to-ST multimode cable, CAB-MTRJ-ST-MM-3M
5-meter, MT-RJ-to-ST multimode cable, CAB-MTRJ-ST-MM-5M
Indicators Per-port status LEDs: link integrity, disabled, activity, speed, and full-duplex indications System status LEDs: system, RPS, and
bandwidth utilization indications
Fiber-port Specifications
(Catalyst 2950C-24)
Optical Transmitter Wavelength: 1300 nm (nanometers) Optical receiver sensibility: -14dBm2 (decibel milliwatt)
Optical transmitter power: -19dBm to -14dBm Transmit: -19dBm to -14dBm
Mean Time Between
Failure (MTBF)
Predictions
Part Number MTBF Predictions (Hours)
Catalyst 2950G-48 159,026
Catalyst 2950G-24 468,884
Catalyst 2950G-24-DC 479,086
Catalyst 2950G-12 482,776
WS-C2950T-24 297,144
WS-C2950C-24 268,292
Description Specification
Power Connectors You can provide power to a switch either by using the internal power supply or the Cisco RPS 300. The
connectors are located at the back of the switch.
Internal Power Supply Connector The internal power supply is an auto ranging unit
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 Connection for an optional Cisco RPS 300 that uses AC input and supplies DC output to the switch
300-watt redundant power system that can support six external network devices and provides power to one
failed device at a time
Automatically senses when the internal power supply of a connected device fails and provides power to the
failed device, preventing loss of network traffic
When internal power supply has been brought up or replaced, the RPS 300 automatically stops powering the
device
Attach only the Cisco RPS 300 (model PWR300-AC-RPS-N1) to the RPS receptacle
Power Requirements Catalyst 2950T-24, 2950C-24, 2950G-12 and 2950G-24: 30W maximum, 102 BTUs per hour
Catalyst 2950G-48: 45W maximum, 154 BTUs per hour
AC input voltage/frequency: 100 to 127 or 200 to 240 VAC (auto-ranging), 50 to 60 Hz
DC Input Voltages: +12V @ 4.5A
Description Specification
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