Installation guide

Port Connections
Consolidated "e" Series Hardware Installation Guide 61
Port Connections
The Summit 400-48t switch has 48 copper 10/100/1000BASE-T ports using RJ-45 connectors for
communicating with end stations and other devices over 10/100/1000 Mbps Ethernet.
The switch also has four fiber ports that allow Gigabit Ethernet uplink connections through Extreme
1000BASE-SX, 1000BASE-LX, or 1000BASE-SX SFP mini-GBICs using LC connectors. Fiber and
mini-GBIC specifications are covered in “Evaluating and Meeting Cable Requirements” on page 27 and
“Evaluating and Meeting Mini-GBIC Requirements” on page 31.
The switch provides full-duplex support for all ports. Full-duplex allows frames to be transmitted and
received simultaneously and, in effect, doubles the bandwidth available on a link. All 10/100/1000
Mbps ports on the Summit 400-48t switch autonegotiate for half- or full-duplex operation.
Uplink Redundancy
The four fiber ports and the first four of the 10/100/1000BASE-T ports are designed as combination
ports for uplink redundancy. When sharing ports, only the fiber port or only the copper port can be
active at the same time. If copper port 1 goes down while transmitting packets, fiber port 1X activates
and becomes the primary link. See Figure 16 for a diagram of these combination ports.
The switch determines whether the port is the primary or redundant port based upon the order in
which the cables are inserted into the switch. When the switch senses that cables are in both the fiber
and corresponding copper port, the switch enables the uplink redundancy feature. For example, if you
insert mini-GBICs into ports 1X and 3X first, and then connect copper ports 1 and 3, the switch assigns
ports 1 and 3 as redundant ports.
Figure 16: Redundancy cabling
You can override the configuration and behavior of these ports through the CLI. Using the CLI, you can
set a preference for either fiber or copper. You can also turn off port redundancy using the force option.
If a combination port fails to link, determine whether the force option is in effect. For more information
about using the CLI to set redundancy priority, see the ExtremeWare Software Users Guide.
The Summit 400-48 switch Gigabit Ethernet port failover from the fiber link to the copper link takes 4-5
seconds. The Summit 400-48t switch Gigabit Ethernet port failover from the copper link to the fiber link
takes 2-3 seconds.
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