3Com 3C16896 8 slot AC Chassis manual Cables Connecting Electrical Port Cables, SC fiber connector

46CHAPTER 2: INSTALLING THE SWITCH 7750

Connecting Module This section describes how to connect electrical and optical cables.

Cables

Connecting Electrical Port Cables

The 48-port 10/100BASE-T module and 8-port 10/100/1000BASE-T module require a RJ-45 connector and category-5 twisted pair cable. See “Electrical Port Connector” on page 78 for an illustration of the RJ-45 connector and MDI/MDI-X pinout details.

Use the following steps to connect the port:

1Plug one end of the straight-through cable into the Ethernet RJ-45 port of the switch.

2Plug the other end of the straight-through cable into

the RJ-45 port of the hub or LAN Switch.

Ports on 48-port 10/100BASE-T and 8-port 10/100/1000BASE-T modules support

MDI/MDI-X auto-sensing.

Connecting Optical Fiber Cables

The following modules require fiber optic cables:

■24-port 100BASE-FX MMF FE module

■20-port 1000BASE-X-SFP module

■1000BASE-SX-MM, 1000BASE-LX-SM-IR, and 1000BASE-LX-SM optional GBIC modules for the 4-port 1000BASE-X-GBIC submodule

When connecting optical fiber cables, use the fiber connectors that are appropriate for the optical port type of the peer equipment that is connected to the local network port module. See “Optical Fiber Cable Connectors” on page 79 for illustrations of the fiber optic cable connectors.

Single-mode optical fiber cable is used for external connections of the single-mode optical port. Multi-mode optical fiber cable is used for external connections of the multi-mode optical port.

Before connecting the optical fiber cable, make sure the type of the connector and the optical fiber cable are consistent with the optical port type.

WARNING: When a connector is not inserted in the optical port or when its dustproof cover is open, invisible radiation can escape from the optical port. Do not stare into the optical port directly. Cover the optical port if there is no connector plugged in.

SC fiber connector

The 8-port 1000BASE-X GBIC module requires an SC optical fiber connector.

To attach the SC fiber connector:

1Plug one end of the SC fiber connector into the optical port in the module.

2Connect the other end of the connector to the corresponding device.