Allied Telesis DNC10 Series, Installation And User Manual

Page: 111 / 118

DNC10 Series Network Interface Cards Installation and User’s Guide
111

Verify that you are using the correct type of fiber optic cable and
that the cable length does not exceed the maximum length. Refer
to Table 9 on page 117.

Verify that the duplex LC ports on the DNC10LC adapter and the
remote network device have the same operating properties, such
as wavelength, fiber optic cable type, and maximum operating
distance. Refer to Table 1 on page 19.

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 (sensitivity) or too strong (maximum input power). Table 9 on
page 117. 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.
DNC10SP
Adapter
Here are troubleshooting suggestions for the DNC10SP adapter:

Verify that the SFP+ transceiver is fully inserted in the port in the
adapter.

Verify that the fiber optic ports on the fiber optic transceiver and
remote network device have the same operating properties,
including wavelength, fiber optic cable type, and maximum
operating distance. Refer to the specifications included with the
transceiver.

Verify that the SFP or SFP+ module is of a supported type.

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 (sensitivity) or too strong (maximum input power). 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.