ECN Functions, Features and HW
10 1553-CNH 160 0787 Uen PA2 2005-09-23
3.1 Switching Unit Architecture and Features
The ECN employs a wire-speed, non-blocking switching fabric.
This permits simultaneous wire-speed transport of multiple packets at low
latency on all ports. The ECN also features full-duplex capability on all
ports, which effectively doubles the bandwidth of each connection.
Auto-negotiation is used to select the optimal transmission speed and
communication mode for each connection. With store-and-forward switch-
ing and flow control, maximum data integrity is always maintained, even
when the loading is heavy.
3.1.1 Connections
The ECN includes two uplink combo 1000BASE-T/SFP ports on the front
panel. Optional slide-in SFP transceivers can provide 100 Mpbs (100BASE-
FX) and 1000 Mbps (1000BASE-SX, 1000BASE-LX, 1000BASE-LH) fiber
links to remote devices. This is utilized in the ELN220 scenario described in
the introduction of this guide.
The ECN330 also contains one independent 1000BASE-T RJ45 port (Port
27) that operates at 10 Mbps or 100 Mbps, half or full duplex, or at 1000
Mbps, full duplex.
The ECN has 24 10BASE-T/100BASE-TX RJ-45 ports. The features of the
ports are summarized below:
• 24 dual-speed ports for 10 or 100 Mbps Ethernet connections, with
support for automatic MDI/MDI-X. All 10/100 RJ-45 ports support
Power-over-Ethernet (PoE)
• Two Gigabit combo ports—use either 10/100/1000BASE-T RJ-45 or
Small Form Factor Pluggable (SFP) transceiver slot (100 Mbps and
1000 Mbps)
• One independent 10/100/1000BASE-T Gigabit Ethernet port
• Auto-negotiation enables each RJ-45 port to automatically select the
optimum communication mode (half or full duplex) for the attached de-
vice
• Unshielded (UTP) cable supported on all RJ-45 ports: Category 3 or
better for 10 Mbps connections, Category 5 or better for 100 Mbps
connections, and Category 5, 5e, or 6 for 1000 Mbps connections
• IEEE 802.3u, IEEE 802.3z, and IEEE 802.3ab compliant
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