Network Turn-Up of Amplified Topologies with Per-Channel Equalization

This chapter describes how to deploy amplified meshed ring and hubbed ring topologies with per-channel equalization.

Before You Begin

This section lists the chapter non-trouble procedures (NTPs). Turn to a procedure for applicable tasks or detailed level procedures (DLPs).

NTP-29 Initial Deployment


Purpose	This procedure describes how to initially turn up a Cisco ONS 15540 ESPx amplified ring network with per-channel equalization.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer)
Prerequisite Procedures	NTP-14 Verify the System Configuration, page 3-32, for every node in the network
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

Step 1

Complete the following steps in each direction for all network topologies:

Prerequisites

•

You are familiar with the Cisco ONS 15540 ESPx, its components, and the Cisco IOS CLI (command-line interface).

•

Cisco ONS 15540 ESPx technical documentation is available during installation, configuration, and testing. You can find the documentation at this URL:

•

You have used design analysis or a design tool, such as Metro Planner, for the network to determine the target power for channel power equalization (Ptarget) at each site, plus EDFA gains (Gain). There may be exceptions in the design analysis where the full equalization is not applied to a particular span. In those cases, the design analysis provides a minimum value to use as the local target power.

Note

The acceptable tolerance that is provided in the procedure for equalizing to the proper Ptarget values should already be accounted for in the design analysis phase.

•

Certain designs that are optimized do not follow the strict per-channel equalization rules. The per-channel equalization rule for equalizing added channels to pass-through channels are relaxed in nonamplified spans. During initial deployment, you can equalize the added channels d to a minimum power derived from the downstream Ptarget value. The Gain for amplifiers is usually set to a mid-range value and then adjusted during the final network equalization.

•

The complete site cabling diagram is available from the design analysis or the design tool. This diagram provides DWDM cabling detail for interchassis and intrachassis connections.

•

All Cisco ONS 15540 ESPx components are installed and optically characterized as described in Chapter 2, "Hardware Installation Procedures," Chapter 3, "Software Setup Procedures," the Cisco ONS 15540 ESPx Hardware Installation Guide, and the Cisco ONS 15540 ESPx Configuration Guide. This includes the transponder modules, mux/demux modules, 4-port VOA modules, and OADM modules with integrated VOA needed in the design. All trunk connections have a one percent optical tap cable if a post-amplifier is not present.

Note

The final mux/demux modules for the design should be installed at initial deployment to allow for future uninterrupted upgrades.

•

You have selected and recorded the Reference Node. For hubbed ring topologies, use the hub node as the Reference Node. For meshed ring topologies, use the optical seam node.

•

You have selected and recorded the Reference Channel on each node. Select an added data channel that is readily available in the initial stage as the Reference Channel. The Reference Channel is initially used to achieve the desired Ptarget with a high degree of accuracy. We recommend that you select a data channel because not all deployments require the OSC (optical supervisory channel).

•

You should perform a procedure in one direction at a time (for example, clockwise). After completing the first pass, perform the same procedure for the other direction (counter-clockwise).

Considerations

•

If you replace the Reference Channel transponder module with a new card during the life of the network, you can use the remaining equalized channels can to adjust the replacement. Adjust and equalize the newly replaced Reference Channel to the average peak of the existing channels.

•

If you remove the Reference Channel and do not replace it with another transponder module, the remaining equalized channels are left intact. If you add a new channel, you can equalize it to the average peak of the existing channels.

•

There are many ways to address the number of people and equipment needed (for example, the OSAs and OPMs). To minimize movements and coordination difficulties during troubleshooting, ideally you can have an individual with an OSA and OPM at every site with conference bridges available. However, this might not always be possible. You can use the following steps to efficiently address this issue:

Start with the Reference Node as the first site. Have individuals with OSAs and OPMs at three consecutive sites moving in one direction around the ring topology.

Complete the procedure in this section, including the specified monitoring and trunk connections, at the first and the second sites.

Then complete the procedure at the second and the third sites, while the individual who was at the first site goes to the fourth site in the ring topology, if one exists.

Complete this procedure on the next two nodes and continue around the ring until you reach the Reference Node.

DLP-83 Equalize the Optical Power on the Reference Node


Purpose	This task equalizes the optical power of the added channels to the selected Reference Channel at the Reference Node site.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer)
Prerequisite Procedures	NTP-14 Verify the System Configuration, page 3-32 Prerequisites
Required/As Needed	Required
Onsite/Remote	Onsite or remote
Security Level	Privileged

•

The following states apply to the corresponding components following the initial installation.

–

ITU lasers on all transponder modules are turned off using the shutdown command on the wave interfaces.

–

OADM module with integrated VOA attenuations are set to the minimum values using the optical attenuation manual command on the filter interfaces and oscfilter interfaces.

–

4-port VOA module attenuations are set to the minimum using the optical attenuation manual command on the voain interfaces.

–

The THRU IN port to THRU OUT port connections between the mux/demux modules are not in place to isolate the added channels.

Step 1

Start with the Reference Node (either the hub node or the optical seam node).

Step 3

Connect the OPM directly to the TRUNK OUT port on the mux/demux module if a post-amplifier is present, or to the trunk connector of the optical tap cable.

Step 4

Make sure that the client services are connected to the transponder module and the client interface is correctly configured.

Step 5

Turn on the ITU laser for the Reference Channel using the no shutdown command on the wave interface or waveethernetphy interface.

Note

At this point the Reference Channel should be the only active signal on the node output trunk. Make sure that the THRU IN and THRU OUT ports on the mux/demux modules are not cabled yet. This prevents pass-through channels from interfering with the added channel equalization procedure.

Note

Use the trunk output of the optical table cable rather than the tap monitoring port to provide a higher degree of accuracy for the Reference Channel that is used for equalizing the other channels.

•

If the Reference Channel is attenuated by an OADM module with integrated VOA, adjust the attenuation using the optical attenuation manual command on the filter interface to bring the Reference Channel power within �0.1 dB of Ptarget.

•

If the Reference Channel is attenuated by a 4-port VOA module, adjust the attenuation using the optical attenuation manual command on the voain interface to bring the Reference Channel power within �0.1 dB of Ptarget.

Step 7

Issue a show interfaces filter command on the OADM module with integrated VOA or a show interfaces voain command on the 4-port VOA module and record the power reading from the command output for future reference.

Step 8

Disconnect the OPM and reconnect the one percent optical tap cable connection.

Make sure that the client services are connected to the transponder module supporting the channel and that the client interfaces are correctly configured to provide more accurate power readings.

Turn the ITU laser on using the no shutdown command on the wave interface or waveethernetphy interface.

–

If the channel is attenuated by an OADM module with integrated VOA, adjust the attenuation using the optical attenuation manual command on the filter interface to equalize the power of the channel within �0.5 dB of the Reference Channel power.

–

If the channel is attenuated by a 4-port VOA module, adjust the attenuation using the optical attenuation manual command on the voain interface to equalize the power of the channel within �0.5 dB of the Reference Channel power.

Use the show interfaces filter command on the OADM module with integrated VOA or a show interfaces voain command on the 4-port VOA module to obtain the power reading and record it for future reference.

Step 11

Equalize the OSC (if present) as described in Step 10 for added data channels, except for modulating the client interface and for using the oscfilter interface on the mux/demux module.

Note

In some designs, the OSC is not completely equalized due to its hop-by-hop nature and the receiver sensitivity range of the OSC on the mux/demux motherboard. Depending on the desired degree of equalization, set the appropriate attenuation for the OSC.

Step 14

Switch the OADM modules with integrated VOA and the 4-port VOA modules to automatic attenuation using the following steps:

For OADM modules with integrated VOA, issue the optical attenuation automatic desired-power command on the filter interfaces and oscfilter interfaces using the power readings recorded in Step 10 and Step 11.

For 4-port VOA modules, issue the optical attenuation automatic desired-power command on the voain interfaces using the power readings recorded in Step 10 and Step 11.

Step 15

Make sure that the connections for the pass through (express) channels are completed by connecting the THRU IN and THRU OUT ports on the mux/demux modules as described in the "DLP-27 Interconnect the Mux/Demux Modules" task on page 2-37.

Connect the OSA to the TRUNK OUT port on the mux/demux module in the desired direction and then store the trace.

Connect the mux/demux module TRUNK OUT port in the desired direction to the trunk input port on the post-amplifier.

Measure the actual gain for all of the channels and compute the average gain.

Use the setgainmean command to adjust the average gain value on the EDFA within �0.1 dB of the value indicated in the design analysis.

Verify that the actual gain values and gain tilt values from the OSA agree with the design analysis. The gain tilt value is the difference between the highest and lowest gain values for all of the added channels.

Disconnect the OSA and connect the trunk to the trunk output port on the post-amplifier.

Step 17

Connect the incoming trunk (or preamplifier, if present) to the mux/demux module TRUNK IN port in the desired direction.

Note The added channels at every site are equalized to their appropriate Ptarget value or the power value designated by the design analysis but the pass-through channels have not been considered yet.

DLP-84 Equalize the Optical Power on Nonreference Nodes


Purpose	This task equalizes the optical power of the added channels to the selected Reference Channel at the nonreference node sites.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer)
Prerequisite Procedures	NTP-14 Verify the System Configuration, page 3-32 Prerequisites
Required/As Needed	Required
Onsite/Remote	Onsite or remote
Security Level	Privileged

•

The following states apply to the corresponding components following the initial installation.

–

ITU lasers on all transponder modules are turned off using the shutdown command on the wave interfaces.

–

OADM module with integrated VOA attenuations are set to the minimum values using the optical attenuation manual command on the filter interfaces.

–

4-port VOA module attenuations are set to the minimum using the optical attenuation manual command on the voain interfaces.

Step 1

If no channels are added on the node in the desired direction, continue to Step 15.

Step 2

Connect an OPM directly to the TRUNK OUT port of the mux/demux module connected to the trunk, if a post-amplifier is present, or to the trunk connector of the optical tap cable.

Step 3

Remove the THRU IN port to THRU OUT port connections between the mux/demux modules to isolate the added channels.

Step 4

Make sure that the client services are connected to the transponder module and the client interface is correctly configured.

Step 5

Turn on the ITU laser for the Reference Channel using the no shutdown command on the wave interface or waveethernetphy interface.

Note

At this point the Reference Channel should be the only active signal on the node output trunk.

Note

Use the trunk output of the optical tap cable rather than the optical tap connector to provide a higher degree of accuracy for the Reference Channel that is used for equalizing the other channels.

•

Step 7

Step 9

Connect an OSA to the TRUNK OUT port or the output port for the trunk signal on the 4-port VOA module, if present to attenuate the trunk signal, and then store the trace.

Step 10

Perform the following steps for each of the other transponder modules:

Make sure that the client services are connected to the transponder module and that the client interfaces are correctly configured to provide more accurate power readings.

Turn the ITU laser on using the no shutdown command on the wave interface or the waveethernetphy interface.

While monitoring the newly added channel with the OSA, adjust the attenuation as follows:

–

Step 11

Equalize the OSC (if present) as described in Step 10 for added data channels, except for modulating the client interface and for using the oscfilter interface on the mux/demux module.

Note

For OADM modules with integrated VOA, issue the optical attenuation automatic desired-power command on the filter interfaces using the power readings recorded in Step 10 and Step 11.

For 4-port VOA modules, issue the optical attenuation automatic desired-power command on the voain interfaces using the power readings recorded in Step 10 and Step 11.

Step 15

Use the inpwr command on the Cisco ONS 15501 EDFA to display the input power level value.

Add the input power level value from the previous step to the ratio NFinal/NProv in dB using the formula

where NFinal is the final number of channels in the network design for the input link and NProv is the number of channels actually provisioned on the input link. This provides enough margin when more channels are provisioned in the future without requiring changes to the gain setting.

•

If a 4-port VOA module is present before the EDFA, increase the attenuation by the calculated power on the voain interface by first using the optical attenuation automatic desired-power command.

•

If a 4-port VOA is not present before the EDFA, decrease the gain by the calculated power on the post-amplifier for the previous node in the desired direction using the setgainmean command.

Connect an OSA to the incoming trunk fiber or the output port for the trunk signal on the 4-port VOA module, if present to attenuate the trunk signal, and then store the trace.

Measure the actual gain for all channels using the OSA and compute the average gain.

Adjust the EDFA gain using the setgainmean command to within �0.1 dB of the power from the network design.

Step 17

If channels are not dropped on this node in the desired direction, go to Step 19.

Step 18

For each channel dropped at the node in the desired direction, perform the following steps:

Remove the MU connector to from the cross connect panel in the cross connect drawer, or from the external fixed attenuator, if present, for the dropped channel and connect an OPM.

Connect an OPM to the filter port on the mux/demux module for the first dropped channel or to the external fixed attenuator, if present.

Verify that the power reading is within the range provided in the network design. If the power reading is not in the desired range, refer to the Cisco ONS 15540 ESPx Troubleshooting Guide.

Step 19

Connect the OSA to the trunk connector of the optical tap cable or to the output port on the EDFA, if a post-amplifier is present.

Step 20

Record the power levels for all pass-through channels and determine the average amplitude.

Step 21

Verify that the average amplitude is within �0.5 dB of the Reference Channel amplitude, or if no channels are added at this node in the desired direction, of the value provided by the network design. If the average amplitude is not within the desired range, verify that each channel is within the average �3*sigma range provided by Metro Planner. If the power reading is still not in the desired range, refer to the Cisco ONS 15540 ESPx Troubleshooting Guide.

Note

If a 4-port VOA module is present at the THRU IN port and THRU OUT port connection between the mux/demux modules, adjust its attenuation with the optical attenuation manual command on the voain interface to reach the desired value.

Connect an OSA to the TRUNK OUT port on the mux/demux module in the desired direction and then store the trace.

Measure the actual gain for all of the channels and calculate the average gain.

Adjust the EDFA gain using the setgainmean command until the gain is within �0.1 dB of the value provided in the network design.

Step 25

Repeat Step 1 through Step 24 on the remaining nodes in the network.

DLP-85 Equalize the Optical Power in a Ring Network Topology


Purpose	This task equalizes the optical power on nodes in either a hubbed ring or meshed ring network topology.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OSA (optical spectrum analyzer)
Prerequisite Procedures	Prerequisites 83 Equalize the Optical Power on the Reference Node 84 Equalize the Optical Power on Nonreference Nodes
Required/As Needed	Required
Onsite/Remote	Onsite or remote
Security Level	Privileged

Step 3

If a preamplifier is present in the desired direction, perform the following steps:

Add the input power level value from the previous step to the ratio NFinal/NProv in dB using the formula

If the calculated input power is greater than 0 dBm, increase the attenuation of the 4-port VOA module before the preamplifier, if present, or decrease the gain on the post-amplifier on the previous node to achieve 0 dBm.

Disconnect the OSA from the trunk fiber, connect it to the output port on the EDFA, and then store the trace.

Measure the actual gain for all of the channels and calculate the average gain.

Adjust the EDFA gain using the setgainmean command to within �0.1 dB of the value provided in the network design.

Step 4

If channels are dropped on this site in the desired direction, perform the following steps for each dropped channel:

Remove the MU connector from the cross connect panel in the cross connect drawer or from the external fixed attenuator, if present, for the dropped channel, and then connect an OPM.

Verify that the power reading is within the range provided by the network design. If the channel power is not in the desired range, refer to the Cisco ONS 15540 ESPx Troubleshooting Guide.

Step 5

Connect an OSA to the EDFA monitor port if a post-amplifier is present or to the tap connector of the optical tap cable if no post-amplifier is present.

If a 4-port VOA module is present, use the optical attenuation manual command on the voain interface to adjust the attenuation within �0.5 dB of the Reference Channel power.

Verify that the channel amplitude is within its �3*sigma range provided by Metro Planner. If the channel amplitude is not in the desired range, refer to the Cisco ONS 15540 ESPx Troubleshooting Guide.

Step 8

Record all power readings from the mux/demux modules using the show interfaces filter command.

Step 9

Record all power readings from the 4-port VOA modules using the show interfaces voain command.

Step 12

If channels are dropped on this site in the desired direction, perform the following steps for each dropped channel:

Remove the MU connector from the cross connect panel in the cross connect drawer or from the external fixed attenuator, if present, for the dropped channel, and then connect an OPM.

Verify that the power reading is within the range provided by the network design. If the channel power is not in the desired range, refer to the Cisco ONS 15540 ESPx Troubleshooting Guide.

Step 13

Connect an OSA to the EDFA monitor port if a post-amplifier is present or to the tap connector of the optical tap cable if no post-amplifier is present.

Step 14

Record the power levels for all pass though channels and determine the average amplitude.

Step 15

NTP-30 Add or Remove Data Channels


Purpose	This procedure describes how to incrementally add a data channel to, or remove it, from an equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OSA (optical spectrum analyzer)
Prerequisite Procedures	29 Initial Deployment
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

DLP-86 Add a Data Channel

Purpose	This task adds a single data channel to an equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer)
Prerequisite Procedures	29 Initial Deployment DLP-79 Install the OADM Modules With Integrated VOA, page 2-20 or DLP-80 Install the 4-Port VOA Module, page 2-21, if necessary DLP-15 Install the Type 1 SM Transponder Module, page 2-22 or DLP-16 Install the Type 1 MM Transponder Module, page 2-23 DLP-18 Install the Type 2 Extended Range Transponder Module, page 2-25 DLP-17 Install the 10-GE Transponder Module, page 2-24 DLP-81 Connect the OADM Modules with Integrated VOA, page 2-56 or DLP-82 Connect the 4-Port VOA Module, page 2-58
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

Step 1

Set the attenuation on the OADM with integrated VOA or 4-port VOA module to the maximum (30 dB for integrated VOA and 25 dB for 4-port VOA) using the optical attenuation manual command on the filter interface or voain interface.

Step 2

Turn on the ITU laser for the added channel using the no shutdown command on the wave interface or waveethernetphy interface.

Step 3

Connect an OSA to the monitor port of the optical tap cable connector.

Step 4

Adjust the OADM module with integrated VOA or 4-port VOA module attenuation in 3 dB increments to equalize the newly added channel to the Reference Channel. If the Reference Channel is not available, use the average peak of the existing equalized channels. Apply smaller increments as the value approaches to the equalized value. The acceptable tolerance is within �0.5 dB of the Reference Channel power.

Step 5

Issue a show interfaces filter command or show interfaces voain command when the channel is equalized and record the power value.

Step 6

If you are using module-level automatic attenuation, issue the optical attenuation automatic desired-power command with the power value determined in Step 5 on the filter interface or voain interface.

DLP-87 Remove a Data Channel


Purpose	This task removes a single data channel from an equalized network.
Tools/Equipment	None
Prerequisite Procedures	29 Initial Deployment
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

Step 1

Use the optical attenuation manual command on the filter interface of the OADM module with integrated VOA or the voain interface on the 4-port VOA module to gradually increase attenuation in 3 dB increments until the attenuation reaches the maximum value (30 dB for filter interfaces and 25 dB for voain interfaces). (This is a conservative recommendation and not due to any limitation, such as EDFA receiver sensitivity.)

Step 2

Monitor the output power to make sure that it is less than -20 dBm for OADM modules with integrated VOA or -15 dBm for 4-port VOA modules.

Step 3

Turn off the line card ITU laser using the shutdown command on the wave interface or waveethernetphy interface.

NTP-31 Add or Remove the OSC


Purpose	This procedure describes how to incrementally add or remove the OSC from an equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer) Number 1 Phillips screwdriver
Prerequisite Procedures	29 Initial Deployment
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

Step 1

As needed, complete the "DLP-88 Add the OSC" task, to add the OSC on an existing equalized network.

Step 2

As needed, complete the "DLP-89 Remove the OSC" task, to remove the OSC from an existing equalized network.

This procedure requires that the final maximum mux/demux module configuration is in place.

DLP-88 Add the OSC


Purpose	This task adds the OSC to an existing equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OSA
Prerequisite Procedures	29 Initial Deployment DLP-8 Install the Mux/Demux Motherboard, page 2-15 for a mux/demux motherboard with OSC, if necessary , or DLP-80 Install the 4-Port VOA Module, page 2-21 DLP-81 Connect the OADM Modules with Integrated VOA, page 2-56, or DLP-82 Connect the 4-Port VOA Module, page 2-58
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

•

The Ptarget value for the Reference Channel has been noted for this particular node. If the analysis has dictated a non-equalized power value for the OSC, an external fixed attenuator can be used at the receiver.

Step 1

Step 2

Turn on the ITU laser for the added OSC using the no shutdown command on the OSC wave interface.

Step 3

Connect an OSA to the monitor port of the optical tap cable connector.

Step 4

Adjust the attenuation in 3 dB increments to equalize the newly added channel to the Reference Channel. If the Reference Channel is not available, use the average peak of the existing equalized channels. Apply smaller increments as the value approaches the equalized value. The acceptable tolerance is within �0.5 dB of the Reference Channel power.

Step 5

Issue a show interfaces filter command or show interfaces voain command once the equalization is achieved and record the power value.

Step 6

Switch to automatic attenuation mode by issuing the optical attenuation automatic desired-power command with the power value determined in Step 5 on the filter interface or voain interface.

DLP-89 Remove the OSC


Purpose	This task removes the OSC from an existing equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer) Number 1 Phillips screwdriver
Prerequisite Procedures	29 Initial Deployment
Required/As Needed	As needed
Onsite/Remote	Onsite or remote
Security Level	Privileged

This procedure assumes that the appropriate services, such as a network management system and APS, that depend on this OSC are addressed properly.

Step 1

Step 2

Monitor the output power to make sure that it is less than -20 dBm for OADM modules with integrated VOA or -15 dBm for 4-port VOA modules.

Step 3

Turn off the laser using the shutdown command on the OSC wave interface.

During initial deployment and future updates to the network, if you remove and reinsert a mux/demux motherboard with OSC online, make sure that the attenuation on the corresponding OADM module with integrated VOA or 4-port VOA module is set to the maximum before removing the mux/demux motherboard with OSC (see the "32 Remove and Reinsert a Transponder Module or Mux/Demux Motherboard With OSC Online" procedure).

NTP-32 Remove and Reinsert a Transponder Module or Mux/Demux Motherboard With OSC Online


Purpose	This procedure describes how to remove and reinsert a transponder module or mux/demux motherboard with OSC that in an equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer) Number 1 Phillips screwdriver
Prerequisite Procedures	29 Initial Deployment
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

DLP-90 Remove and Reinsert a Transponder Module Online


Purpose	This procedure removes and reinserts a transponder module in an equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer) Number 1 Phillips screwdriver
Prerequisite Procedures	29 Initial Deployment
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

Note The online removal and reinsertion of a transponder module must follow these steps. You can avoid inaccurate power readings and incorrect attenuation settings by using this procedure.

Step 1

Read the current OADM module with integrated VOA or 4-port VOA module setting using the show interfaces command on the filter interface or voain interface.

Step 2

Step 3

Use a number 1 Phillips screwdriver to release the captive screws on the transponder module.

Note

If you do not reinsert the same module into the shelf, you must follow the equalization steps in the "DLP-86 Add a Data Channel" task for a new transponder module.

Step 6

Use a number 1 Phillips screwdriver to tighten the captive screws on the transponder module.

Step 7

Reset the attenuation setting to the value obtained in Step 1 using the optical attenuation manual command on the filter interface or voain interface.

Step 8

Switch from manual attenuation mode to automatic attenuation mode by using the optical attenuation automatic desired-power command on the filter interface or voain interface.

DLP-91 Remove and Reinsert a Mux/Demux Motherboard With OSC Online


Purpose	This procedure removes and reinserts a mux/demux motherboard with OSC in an equalized network.
Tools/Equipment	Optical taps installed on the trunk output of every site if a post-amplifier is not present OPM (optical power meter) OSA (optical spectrum analyzer) Number 1 Phillips screwdriver
Prerequisite Procedures	29 Initial Deployment
Required/As Needed	As needed
Onsite/Remote	Onsite
Security Level	None

Note The online removal and reinsertion of a mux/demux motherboard with OSC must follow these steps. You can avoid inaccurate power readings and incorrect attenuation settings by using this procedure.

Step 1

Read the current OADM module with integrated VOA or 4-port VOA module setting using the show interfaces command on the filter interface or voain interface.

Step 2

Step 5

Reinsert the same mux/demux motherboard with OSC into the shelf and seat firmly.

Note

If you do not reinsert the same module into the shelf, you must follow the equalization steps in the "DLP-88 Add the OSC" task for a new mux/demux motherboard with OSC.

Step 7

Reset the attenuation setting to the value obtained in Step 1 using the optical attenuation manual command on the filter interface or voain interface.

Step 8

Switch from manual attenuation mode to automatic attenuation mode by using the optical attenuation automatic desired-power command on the filter interface or voain interface.

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