User guide

18 Summit GbX Installation and User Guide
Troubleshooting the SummitGbX
4 Using an optical power meter, select the appropriate wavelength (780, 1310,
1550 nm) and measure the input power at the ports. Power levels should be above
the minimum specified in Table 3. Optical levels should operate about 3dBm greater
than minimum levels to provide extra link margin.
5 Check the color of SYNC LOSS LEDs. If one of the SYNC LOSS LEDs is yellow, the
Clock/Data Recovery (CDR) was unsuccessful in retiming the data at that input
port. This can be caused by incorrect data rate (for example, 10/100 Mbps), poor
signal quality (excessive jitter), or by a component failure.
6 Follow the loopback troubleshooting procedure, described in the next section.
Never look directly into an optical connector, or through optical instruments or
lenses, to detect presence of light.
L
OOPBACK
T
ROUBLESHOOTING
The purpose of the loopback troubleshooting procedure is to loopback data at various
stages of the link, in order to isolate fault problems. Loopback can be performed
electrically within the SummitGbX, and optically between SummitGbXs. Both methods
are described in this procedure. By examining the hardware included or excluded with
each step, the fault can be isolated to a single piece of equipment or fiber.
The following steps describe the loopback procedure for the SummitGbx, starting on the
end of the link near you. The entire procedure can also be reversed, to start with the
SummitGbX on the remote end of the link. Clean optical connectors before every
connection.
Use one of these methods to verify the outcome of loopback troubleshooting steps:
• The terminal screen, if you are using a serial connection.
• The GUI, if you are using the GUI software.
• The front panel LEDs of the SummitGbX.
1 Using multimode fiber jumper(s), connect the Host’s GBE TX and RX ports.
2 Reconnect the Host’s GBE ports to the SummitGbX GBE port. Verify GBE LoopBack
Enabled status. The GBE Loop Back LED should be yellow.
3 Using the management interface, disable GBE Loopback. Verify Loopback Disabled
status. The GBE Loop Back LED should be green. Connect the SummitGbX LDI TX
output to its LDI RX input using single mode fiber (an optical in-line attenuator is
required for 80 km version only.) Verify optical power at RX.