Chapter 4 Managing the Switch Module
Connecting Devices to the Switch Module
For detailed instructions on installing, removing, and connecting to SFP modules, see the SFP module documentation.
Dual-Purpose Port with RJ-45 and SFP Connectors
The Gigabit Ethernet port GE0/1 on the switch module consists of a pair of one RJ-45 connector (topmost port) and one SFP module connector (bottom port).
This dual-purpose port is considered as a single interface. The two connectors are not redundant interfaces—the switch module activates only one connector of the pair at a time.
If the dual-purpose port is configured as media-type RJ-45, the speed of the connection can be manually set to either 10, 100 or 1000 Mb/s (10/100/1000BASE-T specifications). The default speed setting is always enabled to AUTONEGOTIATION. It will automatically negotiate to whatever speed is set on the other end of the connection.
If the dual-purpose port is configured as media-type SFP, the speed is dependent on the module type you are using, either a 100FX or a 1000BASE-X SFP module. The port will automatically detect the module, and the speed is set based on the media type. The other end of the connection will have to be of the same media type in order to establish the link.
Note Even when operating at 100 Mb/s, the dual-purpose ports (and the SFP-only module slots) use the frame size that is set with the system mtu jumbo global configuration command.
By default, the dual-purpose ports and the SFP-only module slots are network node interfaces (NNIs).
By default, the switch module dynamically selects the dual-purpose port media type that first links up. However, you can use the media-typeinterface configuration command to manually select the RJ-45 connector or the SFP module slot.
Note In auto-selectmode, if both copper and fiber-optic signals are simultaneously detected, the switch module gives preference to SFP mode.
For configuration information, see “Configuring a Dual-Purpose Port” in Chapter 8, “Configuring Interfaces,” in the Cisco 2010 Connected Grid Ethernet Switch Module Interface Card Software Configuration Guide.
The following illustration shows an Ethernet cable connected to the RJ-45 connector of the dual-purpose port (GE0/1). It also shows an SFP cable connected to the standard SFP module slot (GE0/2).
Cisco Connected Grid Ethernet Switch Module Interface Card Getting Started Guide
