Connect optical loopback

Procedure 14-6: Connect optical loopback

Overview

Use this procedure to loop back an out-of-service optical line at the circuit pack faceplate connectors. Optical lines can also be looped back at the LGX equipment to verify correct fiber installation and labeling.

Required equipment

In addition to the equipment listed in Required equipment, one lightguide jumper (MS1A40LC-A40LC-2, Comcode 108918269) for each optical line to be looped back (LC-type connections) is also required.

The following lightguide buildouts (LBOs) are required.

5-dB loss LBO (code ABLCS-05.0: comcode 108279381) or
10-dB loss LBO (code ABLCS-10.0: comcode 108279431) or
15-dB loss LBO (code ABLCS-15.0: comcode 108279480) or
20-dB loss LBO (code ABLCS-20.0: comcode 108279530)

Important!

LBOs are installed on the circuit pack faceplate IN connector only.

Before you begin

Prior to performing this procedure:

Refer to Laser safety and Electrostatic discharge in Chapter 1, Safety.
Obtain the work instructions for this procedure.

Steps

Complete the following steps to loop back an out-of-service optical line.

Obtain the correct LBO and lightguide jumper:

If pluggable transmission module is...

Then obtain a...

Long Reach (LR) Optics

OM155 1.3LR1(L-1.1)

OM622 1.3LR1(L-4.1)

OM622 1.5LR2(L-4.2)

lightguide jumper (MS1A40LC-A40LC-2, Comcode 108918269) and a 20-dB LBO (code ABLCS-20.0, comcode 108279530 for LC connectors)

Intermediate Reach (IR) Optics

OM155 1.3IR1(S-1.1)

OM622 1.3IR1(S-4.1)

lightguide jumper (MS1A40LC-A40LC-2, Comcode 108918269) and a 5-dB LBO (code ABLCS-05.0, comcode 108279381 for LC connectors)

Short Reach (SR) Optics

OM155 1.3SR1(I,1)

No LBO required (attenuation not needed)

If required, remove the optical line connections from the circuit pack faceplate. Make a record of these disconnections so they can be replaced.

Remove the LBO (if equipped) from the IN connector of the circuit pack faceplate. Make a note of the value.

Reference:

Procedure 14-5: Install/remove LC lightguide buildouts (LBOs)

Remove the protector caps from the ends of the lightguide jumper (loopback cable).

NOTICE

Service-disruption hazard

Signal performance may be degraded and the fiber interface surfaces damaged if the connectors/adapters and fiber are not cleaned.

Ensure all optical fiber connectors/adapters and fiber are properly cleaned.

Clean the fiber connectors/adapters and fiber.

Reference:

Procedure 14-3: Clean optical fibers, dual LC adapters and LC lightguide buildouts (LBOs)

Important!

Pluggable transmission modules are shipped with a dust cover installed into the optical ports to maintain cleanliness during storage and/or transportation. It is recommended that the dust cover be kept in place to maintain cleanliness until the optical fiber is connected. With proper care and handling, cleaning the pluggable transmission modules should not be necessary.

If required, clean the pluggable transmission module(s).

Reference:

Procedure 14-19: Clean pluggable transmission module

If required, remove the protective dust cover from the pluggable transmission module. Keep the dust cover clean until reinstalled later, if required.

Install the appropriate LBO on the IN connector, if required. The list of pluggable transmission modules and their corresponding LBOs may be found in Step 1.

Reference:

Procedure 14-5: Install/remove LC lightguide buildouts (LBOs)

Important!

The LBOs and lightguide jumpers connect to the LC-shielded, angled adapter on the circuit pack faceplate.

Using the lightguide angled boot jumper (MS1A40LC-A40LC-2, Comcode 108918269), connect the IN connector and the corresponding OUT connector on the same circuit pack.

Result:

After a short time, the circuit pack FAULT LED and port LED associated with the pluggable transmission module stops flashing. (It may take from 15 seconds to 3.5 minutes for the LED to stop flashing after the cables are connected, depending on the setting of the port signal degrade threshold.) The ACTIVE LED remains on.

If the DCC Termination State is enabled for the port and the LAPD Mode is AITS, the following alarms are also present:

inconsistent DCC values
section DCC channel failed

If responses are not as indicated, check connections and the lightguide jumper. Clean connections and repeat Step 9.

If responses are still not correct, click the Alarm List button to obtain the NE Alarm List. Refer to the Alcatel-Lucent 1850 Transport Service Switch (TSS-5) Maintenance and Trouble-Clearing Guide to clear/isolate the trouble.

Reference:

If required, repeat Step 1 through Step 10 to loop back additional optical lines.

End of steps