Feature history

EDFA front view

Controller and optical port mappings

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

COM-CHECK configuration

The COM-CHECK configuration supports safety behavior for high-power preamplifier deployments.

• Safety measures protect the fiber intranode between the preamplifier and the mux or demux section when the total output power on the COM-TX port is up to 23 dB. These measures compensate for extremely long spans.

• If the output power on COM-TX is less than or equal to 20 dB, the COM-CHECK port can be turned off and does not require a physical connection between the pre COM-CHECK and demux monitor port.

• In some cases, such as spans with high power requirements, safety on the preamplifier is necessary.

• The COM-CHECK PD9 is the safety port.

• The COM-RX controller, such as Ots 0/s/0/0, is not part of safety.

• The safety restart process is similar to the booster case, with some difference in the APR Check phase.

ILA mode supports only the operation of pre-amplifier in both directions. The booster module is switched off in ILA mode. ILA mode supports gain range 1 and 2 of the pre-amplifier and provides 23 dBm output power pre-amplification.

In ILA mode, the LINE-RX and COM-TX ports of the optical amplifier module are enabled, while the LINE-TX and COM-RX ports are disabled. The OCM reports the values for LINE-RX and COM-TX ports, and the values for LINE-TX and COM-RX ports are set to –40.00 dBm. In ILA mode, the LINE-RX port terminates on the optical amplifier module's LINE-RX, and the LINE-TX port terminates on the external OSC module (15216-FLD-OSC=).

Limitation

The setting of a channel width disables the nearest channels.

Configure the channel width

The channel width can be set from 1000 GHz to 8000 GHz.

This command configures the channel width as 100 GHz. This means that the channels are spaced on eight slices at 12.5 GHz each.

hw-module location 0/RP0/CPU0 slot 1 ampli flex-mode
      channel-id 1 channel-width 1000

This command configures the channel width as 800 GHz. This means that the channels are spaced on eight slices at 100 GHz each.

hw-module location 0/RP0/CPU0 slot 1 ampli flex-mode
      channel-id 10 channel-width 8000

PSM front view

Controller and optical port mappings

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

Details

The power value on COM-RX is real if at least one of the W-TX or P-TX power values is not equal to -40 dB (the related port is in AVS).

If both the power of W-TX and P-TX equal -40 dB (both related VOAs are in AVS-Automatic VOA Shutdown), it is impossible to calculate the real power on the COM-RX port, so the value is displayed as -40 dB.

The feature does not require any configuration. Only the show controllers ots 0/<slot>/0/0 command is changed to display the RX power on the COM-RX port. The RX low power alarm is not managed on the COM-RX port.

Example for show controller

RP/0/RP0/CPU0:ios#show controllers ots 0/2/0/0 
Wed Jan 24 14:33:22.898 CET

 Controller State: Up 

 Transport Admin State: In Service 

 Port Type: Com 

 Laser State: Unknown 

 Optics Status:: 


 Alarm Status:
 -------------
 Detected Alarms: None


 Alarm Statistics:
 -----------------
 LOW-RX-PWR = 0 
 LOW-TX-PWR = 0 
 RX-LOS-P = 0 
 RX-LOC = 0 
 AMPLI-GAIN-DEG-LOW = 0 
 AMPLI-GAIN-DEG-HIGH = 0 
 AUTO-LASER-SHUT = 0 
 AUTO-POW-RED = 0 
 AUTO-AMPLI-CTRL-DISABLED = 0 
 AUTO-AMPLI-CFG-MISMATCH = 0 
 SWITCH-TO-PROTECT = 0 
 AUTO-AMPLI-CTRL-RUNNING = 0 

 Parameter Statistics:
 ---------------------
 TX Power = 15.30 dBm 
 RX Power = 5.30 dBm 
 tx-enable = 1 
 rx-enable = 1 

 Configured Parameters:
 -------------
 tx-enable = 1 
 rx-enable = 1 

Parameters of PSM revertive switch

• WTR (Wait To Restore): WTR is the time delay, in seconds, introduced after the LOS alarm on the primary path is cleared. When the WTR timer elapses, traffic moves to the primary path.

• Threshold hysteresis: The threshold hysteresis parameter prevents transient or fluctuating power readings near the threshold monitoring the primary RX port.

  If set, the threshold hysteresis parameter works with the WTR timer. After the fiber cut is fixed and the alarm is cleared, the system starts the WTR timer only when the power on the primary RX port is higher than the combined value of the rx-low-threshold and threshold hysteresis (rx-low-threshold-delta).

Note

The suggested values for WTR and threshold hysteresis parameters are 120 seconds and one dBm, respectively. You must choose both parameter values appropriately based on conditions, such as the power received, the type of PSM protection scheme, whether manual threshold values are provisioned on PSM, or if auto-threshold is enabled.

Limitations

• PSM revertive switch feature is supported only on section protection or path protection schemes.

• PSM revertive switch feature is not supported on PSM three-way protection scheme.

• PSM revertive switch feature is not supported on section protection or path protection schemes involving one or more ILA nodes.

• The PSM revertive switch feature is triggered only when traffic switches from the primary path to the secondary path because of a fiber cut. It does not activate if the switch occurs due to user commands, such as manual-to or lock-out-from.

Details

OSC provides a communication channel for these types of traffic.

• Traffic coming from a UDC port

• Traffic for remote management of NCS 1001