Cabletron Systems 2H253-25R - Manual (Page 30)

100BASE-TX Network
2-2 Network Requirements
2.3 100BASE-TX NETWORK
The two RJ21 connectors on the front panel of the 2H253-25R each provide 12 fixed ports (ports 1
through 24) that support Category 5 UTP cabling. The device at the other end of the twisted pair
segment must meet IEEE 802.3u 100BASE-TX Fast Ethernet network requirements for the
devices to operate at 100 Mbps. Refer to the Cabletron Systems Cabling Guide for details.
NOTE
The fixed ports of the 2H253-25R support Category 5 UTP cabling that has an
impedance between 85 and 111 ohms.
The 2H253-25R is capable of operating at either 10 or 100 Mbps. When the port
is configured for Auto-Negotiation, the 2H253-25R automatically senses the
speed of the other device and adjusts its speed accordingly.