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Cisco WS-X4412-2GB-T 12 x 1000Base-T 2 GBIC 4000/4500

The WS-X4412-2GB-T Gigabit Ethernet switching module offers two dedicated 1000BASE-X (GBIC) ports (ports 13 and 14) and 12 oversubscribed (possibly blocking) 1000BASE-T Gigabit Ethernet ports. The module provides a Gigabit Ethernet network backbone connection for multiple servers and high-end workstations. Ports 13 and 14 each have 1-Gbps dedicated bandwidth. These ports are typically used to connect to the network backbone.

The 12 oversubscribed ports (ports 1 through 12) are multiplexed in three groups of four ports each:

•Ports 1, 2, 3, 4

•Ports 5, 6, 7, 8

•Ports 9, 10, 11, 12

The four ports within each group use common circuitry that effectively multiplexes the group into a single, nonblocking, full-duplex Gigabit Ethernet connection to the internal switch fabric. For each group of four ports, frames received are buffered and sent to the common Gigabit Ethernet link to the internal switch fabric. If the amount of data received for a port begins to exceed buffer capacity, flow control sends pause frames to the remote port to temporarily stop traffic and prevent frame loss.