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3Com Router 5000 and Router 6000 v2.41
Module Guide
Chapter 4 Flexible Interface Cards (Router 6000)
4-14
4.5.5 Connecting the Interface Optic Fiber
Caution:
When connecting the optical fiber, observe the following:
Do not over-bend the optical fiber. Its curvature radius must be no less than 10 cm (3.9
in).
Ensure that the Tx and Rx ends are correctly connected.
Ensure that the fiber ends are clean.
Warning:
Laser danger: Invisible laser radiation may be emitted from the fiber-optic ports which
are connected to lasers. To protect your eyes against radiation harm, never stare into
an open fiber-optic port.
Step 1: Insert the SFP optical module into its corresponding slot.
Step 2: Locate the Rx and Tx ports of the GEF interface. Connect them to another
device with two optical fibers: Rx to Tx and Tx to Rx.
Step 3: Power on the router and check the behavior of the LINK LED on the card panel.
ON means an Rx link is present and OFF means the opposite. In the latter case, check
the line status.
4.6 Router 4-Port/8-Port Enhanced Serial FIC
4.6.1 Introduction
Router 4-Port/8-Port Enhanced Serial FIC, 2-/4-/8-port enhanced high-speed
sync/async serial interface card, transmits, receives, and processes data on the
synchronous/asynchronous serial interface. They support both synchronous and
asynchronous modes. In the former case, they support the DTE/DCE mode.
I. DTE and DCE
An FIC-SA card is usually connected to an external modem for dialing purpose, where
an appropriate baud rate setting is required.
The synchronous serial interface can work in either DTE or DCE mode. Two directly
connected devices must work as DTE and DCE respectively. The DCE provides clock