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Model #: 3C16981
3300 Switch, Refurbished 12 Ports 10/100Mbps
The 3C16981 3Com SuperStack II Switch 3300 provides the smoothest migration to Fast Ethernet with 10/100 autosensing on all ports to adjust automatically to the speed of the attached devices. The SuperStack 3 Switch 3300 is available in 12- or 24-port versions and features an optional expansion modules slot.
SuperStack II Switch Gigabit Ethernet Modules
Provides Gigabit support for SuperStack II Switch 1100, SuperStack II Switch 3300 ( 3C16981 and 3C16980, 3C16982 ), and SuperStack II Switch 3300 FX.
Four SuperStack II Switch 1100 or Switch 3300 units can be interconnected to form a stack that offers unrivaled performance and management features.
Each unit has a built-in connector at the rear of the unit called the matrix port. Two units can be connected back-to-back with a SuperStack II Switch matrix cable. To connect more than two units, a SuperStack II matrix module can be inserted into the high-speed module slot of one of the units in the stack, and a matrix cable can be used to connect to each switch in the stack.
Stacking provides the user with a plethora of benefits. These include the ability to manage in excess of 100 ports as a single logical entity. Configuration is therefore faster and simpler. Stacking also provides the user with the optional resilient IP addresses across the stack. Thus if a failure should occur, the resilient IP address can be used for management stacking using the SuperStack II Switch matrix module and cable, keeping front panel ports free and increasing the number of matrix ports in an aggregated system.
Transcend? network management
Ships with 3Com Transcend Network Supervisor
Security Disconnect Unauthorized Device (DUD)
Roving Analysis Port (RAP)
Class of Service (CoS)
CoS can be defined simply as a method for prioritizing various traffic types. 3Com switches can support two methods of enabling CoS on Ethernet networks. The first method is IEEE 802.1D (incorporating 802.1p), which enables eight levels of prioritization; and the second method is 3Coms innovative PACE? technology, which allows the user to specify certain applications as high priority. A hardware feature, dual queues, is used to exploit these traffic prioritization schemes; the dual queues functionrequired for CoSwill automatically enable a second port buffer for high-priority traffic thereby allowing the traffic to bypass lower priority data for faster processing within the switch.
Broadcast traffic control
Backup power supplies
VLANs allow PCs, workstations, and other resources, including printers and file servers, to be organized into logical, broadcast domains so that only devices within the same domain can communicate with each other. 3Com switches allow users to implement VLANs on their network using one of two schemes: IEEE 802.1Q, including GVRP, which enables the auto-learning of VLANs, or 3Coms VLT. Both methods allow for the configuration of VLANs based on ports and/or MAC addresses for maximum flexibility and security. For 802.1Q VLANs, a port on a switch can be assigned to a VLAN; all other switches learn about that VLAN when the switches automatically communicate that knowledge via the GVRP protocol.
Switches supporting both VLAN schemes can be used to provide seamless migration from VLT to IEEE 802.1Q environments that preserve investment in current LAN developments and equipment.
Layer 3 Support
Multicast filtering using IGMP snooping
Layer 3 switching