Testing IPA

The IPA function decreases the output optical power of an upstream optical amplifier into a safety threshold after it detects the optical power loss in a channel segment. The IPA test is performed to check if the IPA function is started. If IPA is not started, restart the equipment manually.

Prerequisites

You must be an NM user with "NE and network operator" authority or higher.

Tools, Equipment and Materials

U2000 Web LCT

Background Information

For details on how to configure IPA protection groups on the U2000 Web LCT, refer to the Feature Description.

Figure 1 IPA verification diagram

NOTE:

For indices of the units with different specifications in Figure 1, refer to the .

Precautions

CAUTION:

IPA is default to enable. IPA can be disabled only during installation or maintenance. It cannot be disabled during normal operation of the equipment.

Procedure

Log in to the U2000 Web LCT. Double-click the optical NE icon in the Main Topology, and the status figure of the optical NE is displayed.
Right-click an NE icon and select NE Explorer to display the NE Explorer dialogue box.
Select the NE in the left-hand pane and choose Configuration from the Function Tree.
Click Query, IPA Status should be Enable.
Break the fiber connection from A to B.
NOTE:
In the case of the IPA function, if the Raman amplifier is configured and the optical supervisory channel (OSC) board functions as the auxiliary detection board, you need to remove the fiber from the OUT interface of the amplifier board 1 and the fiber from the output interface of the OSC board.
On the U2000 Web LCT, query the optical power of the OUT ports of the OAU and OBU in station A. Verify that the laser of the OBU is off. Verify that the OAU and the OBU output no optical power.
On the U2000 Web LCT, query the optical power of the IN port of the OAU in station A. Verify that there is no input of optical power and that the LOS alarm is reported.
On the U2000 Web LCT, query the optical power of the OUT ports of the two OAUs in station B. Verify that there is no output of optical power.
On the U2000 Web LCT, query the optical power of the IN ports of the two OAUs in station B. Verify that there is no input of optical power and that the LOS alarm is reported.
On the U2000 Web LCT, query the optical power of the IN port of the left OAU and that of the OUT port of the left OBU in station C. Verify that the laser of the OBU is Close with no output of optical power. Verify that the OAU inputs no optical power and that the LOS alarm is reported.
Recover the fiber connection between A and B.
Select the NE from the Navigation Tree and choose Configuration > IPA Management from the Function Tree in NE Explorer.
Click Manual Reboot. A dialog box is displayed, indicating a successful operation.
Click Close.
On the U2000 Web LCT, query the optical power of the OUT ports of the OAU and OBU in station A. Verify that the laser of the OBU is on. Verify that the OAU and the OBU have normal output of optical power.
On the U2000 Web LCT, query the optical power of the IN port of the OAU in station A. Verify that there is input of optical power and that no abnormal alarm is generated.
On the U2000 Web LCT, query the optical power of the OUT ports of the two OAUs in station B. Verify that there is normal output of optical power.
On the U2000 Web LCT, query the optical power of the IN ports of the two OAUs in station B. Verify that there is input of optical power and that there is no abnormal alarm.
On the U2000 Web LCT, query the optical power of the IN port of the left OAU and that of the OUT port of the left OBU in station C. Verify that the laser of the OBU is OPEN with normal output of optical power. Verify that the OAU inputs optical power and that there is no abnormal alarm.
NOTE:
The "left OAU" and "left OBU" in step 7 and step 18 refer to the left OAU and left OBU of station C in Figure 1.