Connecting Network Devices and Checking Connectivity
December 2008 © 2008 Foundry Networks, Inc. 4 - 7
NOTE: The 802.3ab standard (automatic MDI/MDIX detection) calls for automatic negotiation of the connection
between two 1000Base-T ports. Therefore, a crossover cable may not be required; a straight-through cable may
work as well. For more information about this feature, see the Foundry FastIron Configuration Guide (FastIron X
Series Devices) or the Foundry Switch and Router Installation and Basic Configuration Guide (FES devices).
Figure 4.1 UTP crossover cable
Figure 4.2 Cat-5 crossover cable for 1000BaseT
NOTE: The 802.3ab standard calls for automatic negotiation of the connection between two 1000BaseT ports.
Consequently, a crossover cable may not be required; a straight-through cable may work as well.
100Base-TX Support on 1000Base-TX SFP Modules
You can configure a 1000Base-TX SFP (part number E1MG-TX) to operate at a speed of 100 Mbps. To enable
support, you must enter the CLI command 100-tx at the Interface level of the CLI. For CLI command details, see
the section “Enabling and Disabling Support for 100Base-TX” in the Foundry FastIron Configuration Guide.
NOTE: This module requires a Cat5 cable and uses an RJ45 connector. Hotswap is supported for this module
when it is configured in 100M mode.
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UTP Crossover Cable
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Cat-5 Crossover Cable
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