3-2CHAPTER 3: CABLING SWITCH 3900 PORTS

Fast Ethernet Ports

Your Switch 3900 has 24 or 36 10/100BASE-TX ports with RJ-45 connectors. This section contains information on cabling the 10/100BASE-TX (RJ-45) ports and pin assignments for the RJ-45 connectors.

Cabling 10/100BASE-TX (RJ-45) Ports

The Switch 3900 system’s Ethernet ports are shielded RJ-45 data sockets. You can connect shielded or unshielded data cables with shielded or unshielded jacks to these data sockets.

The Ethernet ports are numbered from 1X to 24X or 1X to 36X, depending on your system. They are configured as MDI-X for direct connection to a workstation or other data terminal equipment (DTE), using straight-through twisted-pair wiring.

To connect a Switch 3900 system to a 10/100BASE-TX repeater or switch, use a crossover cable, or set the port on the connected device to MDI and use a straight-through cable.

Follow these guidelines when you cable 10/100BASE-TX connectors:

Use two twisted-pair wires for each link.

Use twisted-pair wire that is 22-26 AWG (0.5 millimeter) in diameter.

Use twisted-pair wire with an impedance of between 85 and 115 Ohms.

Verify that the length of the twisted-pair link from the system to any potential workstation location is 100 meters (328 feet) or less.

To cable a 10/100BASE-TX (RJ-45) port:

1Remove the dust cover and save it for future use.

2Plug the male RJ-45 connector on the 10/100BASE-TX cable into the selected port until it clicks into place.

3Attach the other end of the cable to an MDI port on a workstation, repeater, or concentrator.

4Repeat steps 2 and 3 for the remaining ports.

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3Com 3C39024, 3C39036, 10005622 manual Fast Ethernet Ports, Cabling 10/100BASE-TX RJ-45 Ports

10005622, 3C39024, 3C39036 specifications

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