WS-C2948G-GE-TX | Cisco Ethernet Switch WS-C2948G-GE-TX

Cisco Catalyst 48-Port Managed Gigabit Ethernet Network Switch WS-C2948G-GE-TX. The Cisco Catalyst 2948G-GE-TX switch enhances network performance and productivity with the highest 10/100/ 1000-Mbps port density in a 1 rack unit (RU) form factor in the networking industry. The Cisco Catalyst 2948G-GE-TX is also an affordable solution for delivering gigabit-speed connectivity to the desktop over Category 5 copper cabling. The Cisco Catalyst 2948G-GE-TX has autosensing 48 10/100/1000BASE-T ports and 4 small form-factor pluggable (SFP) ports, providing a total of 52 Gigabit Ethernet ports. The 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.

Cisco Model Number: Catalyst 2948G-GE-TX
Cisco Part Number: WS-C2948G-GE-TX

Specifications:

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. 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.
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)
Power Consumption	130W (maximum), 445 BTUs per hour
AC Input Voltage and Frequency	100–240 VAC (autoranging), 50–60 Hz
DC Input Voltages	RPS input: +12V at 13A

Features and Benefits:

Ease of use and deployment. Dynamic Host Configuration Protocol (DHCP) autoconfiguration of multiple switches through a boot server eases switch deployment. Autosensing on each non-SFP port detects the speed of the attached device and automatically configures the port for 10-, 100-, or 1000-Mbps operation, easing switch deployment in mixed 10, 100, and 1000BASE-T environments. Autonegotiating on all ports automatically selects half- or full-duplex transmission mode to optimize bandwidth. Dynamic Trunking Protocol (DTP) enables dynamic trunk configuration across all switch ports. Port Aggregation Protocol (PAgP) automates the creation of Cisco Fast EtherChannel groups or Gigabit EtherChannel groups to link to another switch, router, or server. Link Aggregation Control Protocol (LACP) allows the creation of Ethernet channeling with devices that conform to IEEE 802.3ad. This feature is similar to Cisco EtherChannel technology and PAgP. DHCP Relay allows a DHCP relay agent to broadcast DHCP requests to the network DHCP server.
Superior redundancy for fault backup. Cisco UplinkFast and BackboneFast technologies help to ensure quick failover recovery, enhancing overall network stability and reliability. IEEE 802.1w Rapid Spanning Tree Protocol provides rapid spanning-tree convergence (independent of spanning-tree timers) and benefit of distributed processing. Per-VLAN Rapid Spanning Tree Plus (PVRST+) allows rapid spanning-tree reconvergence on a per-VLAN spanning-tree basis, without requiring the implementation of spanning-tree instances. Unidirectional link detection (UDLD) and aggressive UDLD allow unidirectional links caused by incorrect fiber-optic wiring or port faults to be detected and disabled on fiber-optic interfaces. Switch port autorecovery (errdisable) automatically attempts to re-enable a link that is disabled due to a network error.
Network-wide security features. IEEE 802.1x allows dynamic, port-based security, providing user authentication. IEEE 802.1x with VLAN assignment allows a dynamic VLAN assignment for a specific user regardless of where the user is connected. Secure Shell (SSH) Protocol, Kerberos, and Simple Network Management Protocol Version 3 (SNMPv3) provide network security by encrypting administrator traffic during Telnet and SNMP sessions. SSH, Kerberos, and the cryptographic version of SNMPv3 require a special cryptographic software image due to U.S. export restrictions. Private VLAN provides security and isolation between switch ports or groups of switch ports called communities, which helps ensure that users cannot snoop on other users’ traffic. Bidirectional data support on the Switched Port Analyzer (SPAN) port allows Cisco Secure Intrusion Detection System (IDS) to take action when an intruder is detected. TACACS+ and RADIUS authentication enables centralized control of the switch and restricts unauthorized users from altering the configuration.