Enterasys Networks Enterasys Gold Distributed Forwarding Engine 4H4284-49 - Manual (Page 30)

100BASE-TX Network
2-2 Network Requirements
100BASE-TX Network
Fixed front panel ports of the 4H4282‐49, 4H4283‐49, 4H4203‐72, and 4H4202‐72 provide a
connection that supports Category 5 UTP cabling. The device at the other end of the
twisted pair segment must meet IEEE 802.3‐2002 100BASE‐TX Fast Ethernet network
requirements for the devices to operate at 100 Mbps. Refer to the Cabling Guide for details.
100BASE-FX Fiber-Optic Network
The 4H4284‐49 DFE‐Gold module provides 48 ports that support 100 Mbps multimode
fiber‐optic connectivity through 48 fixed front‐panel MT‐RJ connectors, which support
100BASE‐FX fiber‐optic cabling. The device at the other end of the fiber‐optic segment
must meet 100BASE‐FX Fast Ethernet network requirements for the devices to operate at
100 Mbps. IEEE 802.3u 100BASE‐FX characteristics for Multimode Fiber is a segment
length of 412 meters (switched port) in half duplex, 2 kilometers (switched port) in full
duplex. This distance will be considerably shorter from a repeater port. Make sure to
check your network diameter specifications. Refer to the Cabling Guide for details.
Note: The fixed ports of the module support Category 5 UTP cabling with an impedance
between 85 and 111 ohms for 100 Mbps operation.
The module is capable of operating at either 10 or 100 Mbps. The module automatically
senses the speed of the other device and adjusts its speed accordingly.