CANOGA PERKINS 9161 Network Interface Device - Manual (Page 45)

9161 Network Interface Device 4-3
Note: Consider this measurement when extending the link at WWDM wavelengths because the
shorter wavelengths have a greater loss.
To measure attenuation:
1. Attach the transmit fiber to the local and remote ends of the link.
Note: To avoid damage, do not over-tighten or force-fit the optical connectors.
2. With a properly calibrated optical power meter, measure the optical power on the fiber that will
be connected to the Rx connector at one site. Record this reading.
Note: Use either a hand-held power meter or other similar measuring device.
3. Repeat this process at the other site.
Troubleshooting
This section describes fault conditions and corrective action. The multifunction LEDs and the alarms
display all failures.
Whenever there is a significant signal loss, first check the fiber path and the minimum bend radius for
problems. Remove and inspect the cable connectors, being careful not to damage the fiber end-face
surface or the connector housing. Clean all optical connectors before reinstalling them.
For details on the LED status during a normal start-up, see Chapter 2.
The front panel LEDs show both normal and fault conditions. Additional information about fault
conditions appears in various status and information screens. To aid troubleshooting, Tables Error!
Reference source not found. and Error! Reference source not found. list the functions of the front
panel LEDs.
New Installation
On new installations, make sure that all steps in Chapter 2 are complete, then follow these steps:
1. Check that the STA LED is green.
2. Check that the fiber type (multimode or single mode) matches the 9161 optical mode.
3. Make these checks:
•
All fiber cabling is of the same type; do not mix multimode and single mode cables.
•
The fiber optic cable is within the specifications and loss budget of the optic interface
module.
•
The line length between the 9161 and the remote link does not exceed the allowable loss
budget or overdrive limit.
•
All host modules in the link are turned on.
•
All fiber cables are connected Tx to Rx and Rx to Tx.