Allied-telesis AT-2746FX Manual do Utilizador descarregar pdf (Página 190)

Chapter 11: Troubleshooting

190

 For a fiber optic port, verify that the operating specifications (for

instance, wavelength and maximum operating distance) of the fiber

optic port on the remote device are compatible with the fiber optic port

on the network adapter card. For example, a fiber optic port with an

operating wavelength of 1310 nm will not function if connected to a

remote fiber optic port with an operating wavelength of 820 nm. Refer

to Chapter 1, “Network Adapter Card Overview” on page 13 for

operating specifications of the fiber optic ports.

 For a fiber optic port, use a fiber optic tester to test signal attenuation

on the cable. If signal strength is too low, you have either exceeded the

permitted maximum length of the fiber optic port or the fiber optic cable

has a problem, such as too many splices. Refer to Chapter 1,

“Network Adapter Card Overview” on page 13 for operating

specifications of the fiber optic ports.

 For a fiber optic port, check to be sure that the two strands of the fiber

optic cable are connected correctly on both the network adapter card

and the remote device. Duplex SC and ST ports consist of two

separate connectors, as shown in Figure 114. Each connects to a

different fiber strand. One is for receiving data and the other is for

transmitting data. When connecting a fiber optic cable to a duplex ST

or SC port, the strands have to cross. That is, the strand connected to

the transmitter connector on the port on the network adapter card must

connect to the receiver port on the remote device, while the strand

connected to the receiver connector on the port on the network

adapter card must connect to the transmitter port on the remote

device.

Figure 114. Duplex ST and SC Ports

1TX RX

Duplex ST Port

Duplex SC Port

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Allied-telesis AT-2746FX Manual do Utilizador Página 190