Hitachi US7070447-001 User Manual

Cabling

US7070447-001, Rev 01

4-3

The 10/100BASE-TX ports on the HiSpeed switch are standard RJ-45 
connections using UTP Category 5 cabling. These ports, like the 10BASE-TX 
ports, are wired for MDI-X and require a crossover cable when connecting to an 
Ethernet hub or another switch.

The 10/100 Mbps ports support autonegotiation where speed is set by polling the 
connected device and determining which speed, 10 Mbps or 100 Mbps, is the 
most optimal.

The 10/100BASE-TX ports on the HiSpeed switch are designed to support both 
half-duplex and full-duplex operation. By definition, the CSMA/CD protocol is 
half-duplex. allowing either data transmission or reception, but never both at the 
same time. Point-to-point network connections, such as DTE-to-switch ports, 
allow a file server to transmit frames to a switch while simultaneously receiving 
frames from the same switch. This two-way, non-CSMA/CD full-duplex 
communication allows an effective bandwidth of 200 Mbps between two devices. 

Both the port speed and the duplex mode can be set using the CLI command

ETHERNET/CONFIG/PORT

For information on these commands, refer to the HiSpeed Switch User Guide, 
document number US7070424-001, that was shipped with your switch.

The 100BASE-FX ports are used to attach fiber-based 100 Mbps connections to 
the switch. These ports provide direct attachment to end stations, switches, or 
servers where multimode fiber is installed. The 100BASE-FX ports accept 
standard SC connections using 62.5/125 micron fiber optic cable. The 
100BASE-FX ports function at full-duplex only (200 Mbps) and does not support 
autonegotiation. 

Since these ports are capable of operating at 100 Mbps, it is imperative 

that only Category 5 cabling be used.