Справочник Пользователя для Cabletron Systems 2E43-51R

Chapter 2: Network Requirements

The 2E43-51, with an FE-100TX installed in slots 5 and/or 6, provides an 
RJ45 connection that supports UTP cabling, which has an impedance of 
85 to 111 ohms. 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.

Slots 5 and 6 of the 2E43-51 can also support the Cabletron Systems 
FE-100FX and FE-100F3 fiber optic interface modules. The device at the 
other end of the fiber optic segment must meet the 100BASE-FX Fast 
Ethernet network requirements to operate at 100 Mbps. Refer to the 
Cabletron Systems Cabling Guide for details.

The maximum multimode fiber optic cable length of a 100BASE-FX 
segment is covered in the Cabletron Systems Cabling Guide. 

The maximum length of a 100BASE-FX segment may be no more than 
412 meters between Data Terminal Equipment (DTE to DTE) in half 
duplex mode or 20 km (DTE to DTE) in full duplex mode.

The 2E43-51 with an FE-100TX installed is capable of 
operating at either 10 or 100 Mbps. The FE-100TX can 
automatically sense the speed of the other device and adjusts 
its speed accordingly.