Allied Telesis 2914 Series, Инструкция по установке и эксплуатации, Страница: 106 / 114

2914 Series Fiber Network Adapters with WoL Installation and User’s Guide
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
Remove all other adapter cards from the system and run the tests
again. If the adapter card passes the tests, the other adapter cards
may be causing contention.

If the remote network device is a managed device, use its
management firmware to determine whether its port is enabled.

If the problem is with two BiDi (bi-directional) transceivers, refer to their
data sheets to verify that their transmission and reception frequencies
are opposite each other. For instance, a BiDi transceiver that transmits
and receives at 1310nm and 1550nm, respectively, has to be
connected to a transceiver that transmits and receives at 1550nm and
1310nm, respectively. Two BiDi transceivers will not establish a link if
they transmit and receive at the same frequencies.

Test the attenuation of both directions on the fiber optic cable with a
fiber optic tester to determine whether the optical signal is too weak or
strong.

If there is no link, try creating a loopback between the TX port and the
RX port of the fiber connector. A successful link may indicate an
incompatibility or fault with the connected cables or equipment.

For the AT-2914SP and AT-2914GP/SP network adapters, verify that
you are using an SFP that is known to work properly.