3Com SuperStack 3 4400 SE 3C17206 Getting Started Manual page 34

34 C 2: I S
HAPTER NSTALLING THE WITCH
Auto-MDIX sensing is required. The maximum cable length is
2 kilometers (1.24 miles).
CAUTION: Do not connect pinned MT-RJ connectors into any port on the
Switch 4400 FX as this may damage the unit. The ports have locator pins
fitted and are designed for standard (pinless) connectors.
To connect a front-panel port to a 100BASE-FX single mode port, or to a
port that does not have an MT-RJ connector, an adaptor will be required.
It is not possible to connect a front panel port to a 1000BASE-FX port.