Specifications

2-3
Cisco Catalyst 2900 Series
Chapter 2 LAN Switching
Cisco Catalyst 2900 Series
The Cisco Catalyst 2948G-GE-TX Gigabit Ethernet switch
offers affordable Gigabit Ethernet connectivity for small and mid-size networks. It enhances
network performance and productivity where higher densities of 10/100/1000BASE-T ports
are required. The Catalyst 2948G-GE-TX is an affordable solution for delivering Gigabit
Ethernet connectivity to the desktop over Category 5 copper cabling.
Key Features
• Autosensing 48 10/100/1000BASE-T ports and 4 small form-factor pluggable (SFP)
ports, providing a total of 52 Gigabit Ethernet ports; 4 SFP ports are wire-speed, and
the 48 10/100/1000BASE-T ports can burst to Gigabit Ethernet line rate and share 12
Gbps of capacity (or 6 Gbps full-duplex) into the switching fabric
• All ports can use Cisco Gigabit EtherChannel® or IEEE 802.3ad for high-speed
interconnection applications
• Uses the standard IEEE 802.3x flow control (PAUSE frame) mechanism to control
Gigabit Ethernet host traffic
• Uses the feature-rich Cisco Catalyst OS software
Specifications
Feature Catalyst 2948G-GE-TX
Fixed Ports (connections)
48 Ethernet 10/100/1000BASE-T ports and 4 SFP-based Gigabit Ethernet ports; )
Full-Duplex Capabilities
6 Gbps full-duplex
VLAN Maximum
2000
Flash Memory
16 MB
DRAM Memory
64 MB
Embedded RMON
Statistics, history, alarms, events
Warranty
Limited lifetime hardware warranty
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 provide power to a switch by using either the internal power supply or the Cisco RPS 675. Internal
Power Supply Connector: autoranging 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: optional Cisco
RPS 675 that uses AC input and supplies DC output to the switch, offers a 675W RPS that supports up to 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, Only
the Cisco RPS 675 (model PWR675-AC-RPS-N1=) should be attached to the redundant power supply receptacle
RPS
Yes, RPS 675
Indicators
Per-port link status LED; System-status LEDs: system, power, and RPS
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)
Safety Certifications
UL to UL 60950, Third Edition; C-UL to CAN/CSA C22.2 No. 60950-00, Third Edition; TUV/GS to EN 60950:2000; CB to
IEC 60950 with all country deviations; NOM to NOM-019-SCFI; CE Marking
Dimensions (HxWxD)
1.73 x 17.5 x 17 in. (4.39 x 44.5 x 43.1 cm)
Weight
13 lb (5.9 kg)
Electromagnetic
Emissions Certifications
FCC Part 15 Class A; EN 55022: 1998 (CISPR22); EN 55024: 1998 (CISPR24); VCCI Class A; AS/NZS 3548 Class A; CE;
CNS 13438 Class A; MIC
Telco
CLEI code