The optical amplifier module (NCS1K-EDFA) has pre-amplifier and booster amplifier.

The optical amplifier module provides the following functionality.

• Preamplifier (LINE-RX to COM-TX) - Single preamplifier variant, with switchable gain ranges, according to link loss:

  • Range # 1: 0 to 24 dB gain, Tilt control: 24 to 27 gain, with tilt uncontrolled

  • Range # 2: 20 to 34 dB gain, Tilt control: 34 to 37 dB gain, with tilt uncontrolled

  • 23dBm output power @ COM-TX port

• Booster amplifier (COM-RX to LINE-TX) - True variable gain booster amplifier

  • Gain range: 1 to 20. 20 to 25 uncontrolled tilt.

  • 23dBm output power @ LINE-TX port

• ADD/DROP OSC channel supports both 1510nm and 1610nm +/-10nm

• OCM assesses channel presence and Gain regulation and per channel power monitoring.

The following table describes the mapping of controllers and optical ports for the optical amplifier module.

NCS 1001 supports two methods to control amplifiers.

• Manual-All the amplifier settings are controlled by the user.

• Automatic-All the amplifier settings are controlled by the internal amplifier power regulator.

UDC Application for Remote Management

The following diagrams describe the application of UDC that can be used by EPNM to manage NCS 1000 series at the remote site.

configure

hw-module location 0/RP0/CPU0 slot slot-number ampli

node-type value

grid-mode value

udc-vlan value

commit

end

configure
hw-module location 0/RP0/CPU0 slot 3 ampli
   [
       grid-mode 100GHz
       udc-vlan 4000
   ]

The protection switching module (NCS1K-PSM) provides the following functionality.

• In TX section:

  • Splits input optical channels to both working and protection lines.

  • Forces the switch in the remote site by opening one of the two line paths (by putting the related VOA in AVS).

• In RX section:

  • Selects the signals from working or protection line. Each line is monitored through a PD.

  • Balances the two line losses by changing the VOA attenuation value at the same time of the switch change of state.

The following table describes the mapping of controllers and optical ports for the protection switching module.

The following table explains the possible configuration on Protection Switching Module:

conf t
#hw-module location 0/RP0/CPU0 slot 2 psm lockout-from "working"
commit

Note	FPD upgrade on FW_PSMv1 from FW 1.43 and FW 1.44 to FW 1.45 affects the traffic.

(From R6.2.1) Section Protection

See the PSM Module Configuration Parameters section to set the section-protection parameter on both the PSMs. Ensure that the PSM in a section protection topology is inserted in slot 2. Connect the EDFA in slot 1 to the Protected port of the PSM and EDFA in slot 3 to the Working port of the PSM.

Note

To measure the correct switching time while testing the section protection topology, we recommend you to wait for 120 seconds between two subsequent switching events (or between a switching event and the restoration). This waiting period allows the EDFAs to stabilize after the first switching occurrence, thus avoiding the power at the PSM to oscillate around the threshold.

Protection Switching Module with Manual Threshold

The switch can operate in all conditions, if it is set in Autothreshold.

When the path protection is configured with a manual threshold, you must ensure that:

• During the first installation, the value on the PSM RX-low Threshold should be set as 3 dB below the minimum power for a single channel. The value must ensure that the PSM is able to switch on with a single channel or when the EDFA is in APR (+8 dBm).

• When the system is up and running with the final number of channels, the PSM RX-low Threshold must be set 3 dB below the target power.

• After a fiber cut and restore, in order to ensure that the PSM is able to switch on, it is necessary to set the value of PSM RX-low Threshold similar to the value set during the first installation.

The PSM Auto-threshold configuration is highly recommended for a three-way topology.

In a three-way topology, when the path protection is configured with a manual threshold, you must follow the above steps. If you did not configure all the above steps properly, you may encounter the following issues:

• Switch may not be bidirectional.

• Double switch on PSM in path protection, when set in three-way configuration.

It is possible to configure parameters such as rx-enable, tx-enable in OTS controllers (1 or 2, i.e. working or protected port) of PSM card.

For more information on OTS controllers, see Configure OTS Controller.