3Com 3CR17450-91, 3CR17451-91 manual Remove the plastic protective cover if fitted

26CHAPTER 2: INSTALLING THE SWITCH

Use this transceiver to connect the Switch directly to a single-mode fiber-optic cable or to multimode fiber using a conditioned launch cable.

■1000BASE-LH70 SFP transceiver

Use this transceiver to connect the Switch directly to a single-mode fiber-optic cable.

If the SFP transceiver is faulty, it will not operate within the Switch. See “Solving Hardware Problems” on page 47.

3Com recommends that you only use SFPs supplied by 3Com. If the SFP transceiver is invalid it will not be recognized by the Switch.

Use the following sequence of steps to activate the SFP ports:

1The SFP transceiver is keyed and there is only one way in which it can be installed correctly. It is not necessary to power-down your Switch.

2Hold the transceiver so that the connector is toward you and the product label is visible. Ensure the wire release lever is closed (in the upright position).

3Gently slide the transceiver into the SFP port until it clicks. If the transceiver does not click into place, remove it, turn it over and re-insert.

4Remove the plastic protective cover if fitted.

CAUTION: The dual personality ports on the Switch 3870 enable you to activate an RJ-45 port or an SFP port or a mixture of both (for example,on the 24 Port Switch, you can activate the RJ-45 ports 21 and 22 and the SFP ports 23 and 24 at the same time). If you try to activate the same dual personality RJ-45 port and SFP port (for example, RJ-45 port 23 and SFP port 23 at the same time), the SFP port will take priority.