Configuring QDD Optical Line System

Table 1. Feature History Table

Feature Name

Release Information

Description

QDD Optical Line System

Release 24.4.1

Introduced in this release on: NCS 540 Series Routers (select variants only*)

The QDD Optical Line System (OLS) is a new pluggable optical amplifier that interconnects two routers or switches for transmitting traffic on a limited number of coherent optical channels over a single span point-to-point link. With the QDD OLS pluggable, it’s now possible to obtain the functionality of amplification into a QSFP-DD module that can be plugged into a port of the router or switch.

The benefits of this pluggable are:

  • Provides compact solution for amplification.

  • Provides extended reach.

  • Increases fiber bandwidth.

  • Lowers power dissipation.

This feature introduces the following: * The QDD Optical Line System is now supported on the following hardware:

  • N540-24Q8L2DD-SYS

The QDD OLS is a pluggable optical amplifier that interconnects two routers or switches for transporting a limited number of coherent optical channels over a single span point-to-point link.

Currently, an optical line system (OLS) requires a separate Cisco Network Convergence System 1000 Series or Cisco Network Convergence System 2000 Series optical system with dedicated 48 or 64 channels MUX/DMX units and amplifiers. The new QDD OLS module provides amplification functionality in a QSFP module, while the passive cables provide MUX/DMX functionality. With this solution, you can compress a point-to-point DWDM system directly into the routing or switching platform.

The new optical line system can now transport 8 or 16 optical channels without any additional optical hardware unit. With the use of external passive MUX/DMX units (examples for these) along with this setup, it’s also possible to obtain up to 32 optical channels.

Figure 1. QDD Optical Line System

Supported Routers and MPAs

The support of the QDD OLS pluggable on the routers and MPA is explained as follows:

  • The QDD OLS pluggable can be directly inserted into the N540-24Q8L2DD-SYS routers.

Supported Wavelength or Frequency Configuration

For each channel supported through ONS-BRK-CS-8LC or ONS-BRK-CS-16LC passive/mux cable, the wavelength or the frequency must be configured according to the table below.

Table 2. QDD OLS Operating Signal Wavelength Range

Channel Spacing

Total Bandwidth

Wavelength

Frequency
Start End Start End

8 channels - 200 GHz spaced

16 channels - 100 GHz spaced

19.2 nm

2.4 THz

1539.1 nm

1558.4 nm

192.375 THz

194.775 THz

Functional Description of QDD OLS

The QDD OLS pluggable contains the COM side and the Line side as shown in the figure below:
Figure 2. Functional Description of QDD OLS

Each physical port of the QDD OLS pluggable is represented as two ots controllers (subport 0 and subport 1). COM port is subport 0 and Line port is subport 1.

The Gain of the Booster is associated to subport 1 while the gain of the Preamplifier is associated to subport 0.

Controller

Optical Ports

ots R/S/I/P/0

COM-RX (booster input)

COM-TX (preamplifier output)

ots R/S/I/P/1

LINE-RX (preamplifier input)

LINE-TX (booster output)

QDD OLS Configurations

The following section contains the QDD OLS configuration details.

Configuring the Operational Mode, Amplifier Gain, and Amplifier Output Power

You can configure the mode of operation of the OLS pluggable to either gain control or power control mode.

In the gain control mode, you can configure the desired gain value of the OLS pluggable.

In the power control mode, you can configure the desired output power (TX) of the OLS pluggable.

Gain Control Operational Mode and Amplifier Gain Configuration Example

The following example shows how to configure the gain control operational mode and the amplifier gain of the OLS pluggable:
Router#config
Router(config)#controller ots 0/0/2/1/0
Router(config-Ots)#ampli-control-mode manual
Router(config-Ots)#egress-ampli-gain 150
Router(config-Ots)#commit
Router(config-Ots)#exit
Router(config)#exit

Running Configuration

This example shows the running configuration for the OLS pluggable:

Router#show run controller optics 0/0/2/1/0
controller Ots0/0/2/1/0
 ampli-control-mode manual
 egress-ampli-gain 150
!
!

Verification

This example shows how to verify the configured gain control operational mode and amplifier gain of the OLS pluggable: 

Router#show controllers ots 0/0/2/1/0
Thu Mar 23 21:33:49.862 UTC

Controller State: Up
 
Transport Admin State: In Service
 
LED State: Green
 
                Alarm Status:
                -------------
                Detected Alarms: None
  
                Alarm Statistics:
                -----------------
                RX-LOS-P = 4         
                 RX-LOC = 0         
                 TX-POWER-FAIL-LOW = 1         
                 INGRESS-AUTO-LASER-SHUT = 0         
                 INGRESS-AUTO-POW-RED = 0         
                 INGRESS-AMPLI-GAIN-LOW = 0         
                 INGRESS-AMPLI-GAIN-HIGH = 0         
                 EGRESS-AUTO-LASER-SHUT = 0         
                 EGRESS-AUTO-POW-RED = 0          
                 EGRESS-AMPLI-GAIN-LOW = 4         
                 EGRESS-AMPLI-GAIN-HIGH = 1         
                 HIGH-TX-BR-PWR = 0         
                 HIGH-RX-BR-PWR = 0         
                 SPAN-TOO-SHORT-TX = 0         
                 SPAN-TOO-SHORT-RX = 0         
 
                Parameter Statistics:
                ---------------------
                Total Tx Power = 16.72 dBm
                 Rx Signal Power = -22.29 dBm
                 Tx Signal Power = 16.53 dBm
                 Egress Ampli Gain = 14.7 dB
                Egress Ampli OSRI = OFF
 
                Configured Parameters:
                -------------
                Egress Ampli Gain = 15.0 dB
                 Egress Ampli Power = 4.0 dBm
                Egress Ampli OSRI = OFF
                 Ampli Control mode = Manual
                 Rx Low Threshold = -30.0 dBm
                 Tx Low Threshold = -5.0 dBm
 
 
                Temperature = 27.92 Celsius
                 Voltage = 3.33 V
 
Optical Module Details
 
                Optics type                 : QDD DUAL EDFA
                Name                        : CISCO-II-VI
                OUI Number                  : 00.90.65
                Part Number                 : 60P310001
                Rev Number                  : 01
                Serial Number               : IFB26520001
                PID                         : ONS-QDD-OLS
                VID                         : VES1
                Firmware Version            : 0.10
                Date Code(yy/mm/dd) : 23/02/22
                Fiber Connector Type    : CS

Power Control Operational Mode and Amplifier Output Power Configuration Example

The following example shows how to configure the power control operational mode and the amplifier output power of the OLS pluggable :
Router#config
Router(config)#controller ots 0/0/2/1/0
Router(config-Ots)#ampli-control-mode powermode
Router(config-Ots)#egress-ampli-power 50
Router(config-Ots)#commit
Router(config-Ots)#exit
Router(config)#exit

Running Configuration

This example shows the running configuration for the OLS pluggable:

Router(controller-Ots)#show run controller ots 0/0/2/1/0
controller Ots0/0/2/1/0
 ampli-control-mode powermode
 egress-ampli-power 50
!

Verification

This example shows how to verify the configured power control operational mode and amplifier output power of the OLS pluggable: 

Router#show controllers ots 0/0/2/1/0
Thu Jun  1 08:56:37.236 UTC
 
Controller State: Up
 
Transport Admin State: In Service
 
LED State: Green
 
                Alarm Status:
                -------------
                Detected Alarms: None
 
                Alarm Statistics:
                -----------------
                RX-LOS-P = 4         
                 RX-LOC = 0         
                 TX-POWER-FAIL-LOW = 1         
                 INGRESS-AUTO-LASER-SHUT = 0         
                 INGRESS-AUTO-POW-RED = 0         
                 INGRESS-AMPLI-GAIN-LOW = 0         
                 INGRESS-AMPLI-GAIN-HIGH = 0         
                 EGRESS-AUTO-LASER-SHUT = 0         
                 EGRESS-AUTO-POW-RED = 0         
                 EGRESS-AMPLI-GAIN-LOW = 4         
                 EGRESS-AMPLI-GAIN-HIGH = 1          
                 HIGH-TX-BR-PWR = 0         
                 HIGH-RX-BR-PWR = 0         
                 SPAN-TOO-SHORT-TX = 0         
                 SPAN-TOO-SHORT-RX = 0         
 
                Parameter Statistics:
                ---------------------
                Total Tx Power = 5.00 dBm
                 Rx Signal Power = -22.29 dBm
                 Tx Signal Power = 4.99 dBm
                 Egress Ampli Gain = 3.2 dB
                Egress Ampli OSRI = OFF
 
                 Configured Parameters:
                -------------
                Egress Ampli Gain = 15.0 dB
                 Egress Ampli Power = 5.0 dBm
                Egress Ampli OSRI = OFF
                 Ampli Control mode = Power
                 Rx Low Threshold = -30.0 dBm
                 Tx Low Threshold = -5.0 dBm
  
                Temperature = 29.33 Celsius
                 Voltage = 3.34 V
 
Optical Module Details
 
                Optics type                  : QDD DUAL EDFA
                Name                         : CISCO-II-VI
                OUI Number                   : 00.90.65
                Part Number                  : 60P310001
                Rev Number                   : 01
                Serial Number                : IFB26520001
                PID                          : ONS-QDD-OLS
                VID                          : VES1
                Firmware Version             : 0.10
                Date Code(yy/mm/dd)          : 23/02/22
                Fiber Connector Type         : CS

Configuring the Low-Threshold Power

You can set the low-threshold power of the optical signal (RX and TX) that can be received or transmitted from the OLS pluggable.

Low-Threshold Power Configuration Example

The following example shows how to configure the optical receive (RX) low-threshold power on the OLS pluggable:
Router#config
Router(config)#controller ots 0/0/2/1/0
Router(config-Ots)#rx-low-threshold -200
Router(config-Ots)#commit
Router(config-Ots)#exit
Router(config)#exit

Note

To configure the optical transmit (TX) low-threshold power on the OLS pluggable, use the tx-low-threshold tx-low command.

Running Configuration

This example shows the running configuration for the OLS pluggable:

Router#show run controller ots 0/0/2/1/0
controller Ots0/0/2/1/0
 rx-low-threshold -200
!
!

Verification

This example shows how to verify the configured optical receive (RX) low-threshold power value for the OLS pluggable: 

Router#show controllers ots 0/0/2/1/0

 Controller State: Up 

 Transport Admin State: In Service 

 LED State: Yellow 

         Alarm Status:
         -------------
         Detected Alarms: 
                 RX-LOS-P    

         Alarm Statistics:
         -----------------
         RX-LOS-P = 0          
         RX-LOC = 0          
         TX-POWER-FAIL-LOW = 0          
         INGRESS-AUTO-LASER-SHUT = 0          
         INGRESS-AUTO-POW-RED = 0          
         INGRESS-AMPLI-GAIN-LOW = 0          
         INGRESS-AMPLI-GAIN-HIGH = 0          
         EGRESS-AUTO-LASER-SHUT = 0          
         EGRESS-AUTO-POW-RED = 0          
         EGRESS-AMPLI-GAIN-LOW = 0          
         EGRESS-AMPLI-GAIN-HIGH = 0          
         HIGH-TX-BR-PWR = 0          
         HIGH-RX-BR-PWR = 0          
         SPAN-TOO-SHORT-TX = 0          
         SPAN-TOO-SHORT-RX = 0          

         Parameter Statistics:
         ---------------------
         Total Tx Power = -50.00 dBm 
         Rx Signal Power = -50.00 dBm 
         Tx Signal Power = -50.00 dBm 
         Egress Ampli Gain = 0.0 dB
         Egress Ampli OSRI = OFF 
          
                    
         Configured Parameters:
         -------------
         Egress Ampli Gain = 20.0 dB 
         Egress Ampli Power = 8.0 dBm
         Egress Ampli OSRI = OFF 
         Ampli Control mode = Manual 
         Rx Low Threshold = -20.0 dBm 
         Tx Low Threshold = -5.0 dBm 
          
          
         Temperature = 14.29 Celsius 
         Voltage = 3.37 V 
          
 Optical Module Details
          
         Optics type            : QDD DUAL EDFA
         Name                   : CISCO-ACCELINK
         OUI Number             : 00.00.00
         Part Number            : EDFA-211917-QDD
         Rev Number             : 19
         Serial Number          : ACW2631Z00X
         PID                    : ONS-QDD-OLS=
         Firmware Version       : 1.09
         Date Code(yy/mm/dd)    : 22/06/02
         Fiber Connector Type   : CS

Configuring the Optical Safety Remote Interlock (OSRI)

To shut down the amplifier, use the Optical Safety Remote Interlock (OSRI) configuration. This configuration is used during the maintenance of the pluggable, debugging scenarios, and when the OLS pluggable isn’t in use. With this configuration enabled, the output power can still be a maximum of -15dBm based on the input power.

OSRI Configuration Example

The following example shows how to configure the Optical Safety Remote Interlock (OSRI) on the OLS pluggable:
Router#config
Router(config)#controller ots 0/0/2/1/0
Router(config-Ots)#egress-ampli-osri on
Router(config-Ots)#commit
Router(config-Ots)#exit
Router(config)#exit

Running Configuration

This example shows the running configuration for the OLS pluggable:

Router#show run controller optics 0/0/2/1/0
controller Ots0/0/2/1/0
 egress-ampli-osri on
 !

Verification

This example shows how to verify the configured OSRI for the OLS pluggable: 

Router#show controllers ots 0/0/2/1/0

Thu Jun  1 09:04:10.335 UTC
 
Controller State: Up
 
Transport Admin State: In Service
 
LED State: Green
 
                Alarm Status:
                -------------
                Detected Alarms: None
  
                Alarm Statistics:
                -----------------
                RX-LOS-P = 4         
                 RX-LOC = 0         
                 TX-POWER-FAIL-LOW = 1         
                 INGRESS-AUTO-LASER-SHUT = 0         
                 INGRESS-AUTO-POW-RED = 0         
                 INGRESS-AMPLI-GAIN-LOW = 0         
                 INGRESS-AMPLI-GAIN-HIGH = 0         
                 EGRESS-AUTO-LASER-SHUT = 0         
                 EGRESS-AUTO-POW-RED = 0         
                 EGRESS-AMPLI-GAIN-LOW = 4         
                 EGRESS-AMPLI-GAIN-HIGH = 1         
                 HIGH-TX-BR-PWR = 0         
                 HIGH-RX-BR-PWR = 0         
                 SPAN-TOO-SHORT-TX = 0         
                 SPAN-TOO-SHORT-RX = 0         
 
                Parameter Statistics:
                ---------------------
                Total Tx Power = -50.00 dBm
                 Rx Signal Power = -22.36 dBm
                 Tx Signal Power = -50.00 dBm
                 Egress Ampli Gain = 0.0 dB
                Egress Ampli OSRI = ON
 
                Configured Parameters:
                -------------
                Egress Ampli Gain = 15.0 dB
                 Egress Ampli Power = 5.0 dBm
                Egress Ampli OSRI = ON
                 Ampli Control mode = Power
                 Rx Low Threshold = -30.0 dBm
                 Tx Low Threshold = -5.0 dBm
 
                Temperature = 27.90 Celsius
                 Voltage = 3.34 V
 
Optical Module Details
 
                Optics type                     : QDD DUAL EDFA
                Name                            : CISCO-II-VI
                OUI Number                      : 00.90.65
                Part Number                     : 60P310001
                Rev Number                      : 01
                Serial Number                   : IFB26520001
                PID                             : ONS-QDD-OLS
                VID                             : VES1
                Firmware Version                : 0.10
                Date Code(yy/mm/dd)             : 23/02/22
                Fiber Connector Type            : CS

Configuring Safety Control Mode

You can enable safety control mode only on subport 1.

With safety-control-mode set as auto and if LOS is detected on the line RX, the line TX normalizes the signal output power to 8 dBm and the ALS (automatic laser shutdown) and APR (automatic power reduction) alarms are raised.

Safety Control Configuration Example

The following example shows how to enable safety control mode on the OLS pluggable (on subport 1):
Router#config
Router(config)#controller ots 0/0/2/1/1
Router(config-Ots)#egress-ampli-safety-control-mode auto
Router(config-Ots)#commit
Router(config-Ots)#exit
Router(config)#exit

Running Configuration

This example shows the running configuration for the OLS pluggable:

Router#show run controller ots 0/0/2/1/1
controller Ots0/0/2/1/1
 ampli-control-mode manual
 egress-ampli-gain 230
 egress-ampli-safety-control-mode auto
!

Verification

This example shows how to verify the configured safety control mode: 

Router#show controllers ots 0/0/2/1/1

 Thu Jun  1 09:04:17.550 UTC
 
Controller State: Down
 
Transport Admin State: In Service
 
LED State: Yellow
 
                Alarm Status:
                -------------
                Detected Alarms:
                                 RX-LOS-P   
                                 EGRESS-AUTO-LASER-SHUT   
                                 EGRESS-AUTO-POW-RED   
                                 EGRESS-AMPLI-GAIN-HIGH   
 
                Alarm Statistics:
                -----------------
                RX-LOS-P = 12        
                 RX-LOC = 0         
                 TX-POWER-FAIL-LOW = 1         
                 INGRESS-AUTO-LASER-SHUT = 0         
                 INGRESS-AUTO-POW-RED = 0         
                 INGRESS-AMPLI-GAIN-LOW = 0         
                 INGRESS-AMPLI-GAIN-HIGH = 0         
                 EGRESS-AUTO-LASER-SHUT = 13        
                 EGRESS-AUTO-POW-RED = 13        
                 EGRESS-AMPLI-GAIN-LOW = 2         
                 EGRESS-AMPLI-GAIN-HIGH = 12        
                 HIGH-TX-BR-PWR = 0         
                 HIGH-RX-BR-PWR = 0         
                 SPAN-TOO-SHORT-TX = 0         
                 SPAN-TOO-SHORT-RX = 0         
 
                Parameter Statistics:
                ---------------------
                Total Tx Power = 8.08 dBm
                 Rx Signal Power = -50.00 dBm
                 Tx Signal Power = 5.61 dBm
                 Egress Ampli Gain = 28.9 dB
                Egress Ampli Safety Control mode = auto
                 Egress Ampli OSRI = OFF
 
 
 
                Configured Parameters:
                -------------
                Egress Ampli Gain = 23.0 dB
                 Egress Ampli Power = 3.0 dBm
                Egress Ampli Safety Control mode = auto
                 Egress Ampli OSRI = OFF
                 Ampli Control mode = Manual
                 Rx Low Threshold = -30.0 dBm
                 Tx Low Threshold = -5.0 dBm
 
 
                Temperature = 23.00 Celsius
                 Voltage = 3.36 V
 
Optical Module Details
 
                Optics type                     : QDD DUAL EDFA
                Name                            : CISCO-ACCELINK
                OUI Number                      : 00.00.00
                Part Number                     : EDFA-211917-QDD
                Rev Number                      : 24
                Serial Number                   : ACW2651Z001
                PID                             : ONS-QDD-OLS
                VID                             : VES1
                Firmware Version                : 2.04
                Date Code(yy/mm/dd)             : 22/12/27
                Fiber Connector Type            : CS

OLS Alarms Troubleshooting

This section contains the procedures for troubleshooting alarms.

RX-LOS-P

Default Severity: Critical

Logical Object: Controller

The RX-LOS-P alarm is raised when there is loss of signal.

Clear the RX-LOS-P Alarm

  1. Verify the transmission (TX) at the peer end.

  2. Check the fiber connections.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

RX-POWER-FAIL-LOW

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The RX-POWER-FAIL-LOW alarm is raised when the RX power is below the configured low threshold values.

Clear the RX-POWER-FAIL-LOW Alarm

  1. Verify the transmission (TX) at the peer end.

  2. Check the fiber connections.

  3. Increase the peer end gain or transmit-power value to obtain the RX power above the threshold.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

TX-POWER-FAIL-LOW

Default Severity: Critical

Logical Object: Controller

The TX-POWER-FAIL-LOW alarm is raised when the TX power is below the configured low threshold values.

Clear the TX-POWER-FAIL-LOW Alarm

  1. Increase the gain or power configuration value to obtain the TX power above the threshold.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

EGRESS-AMPLI-GAIN-LOW

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The EGRESS-AMPLI-GAIN-LOW alarm is raised when the actual gain of the OLS pluggable is lower than the configured gain value.

Clear the EGRESS-AMPLI-GAIN-LOW Alarm

  1. Configure the gain value within the optimum range.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

EGRESS-AMPLI-GAIN-HIGH

Default Severity: Minor (MN), Non-Service-Affecting (NSA)

Logical Object: Controller

The EGRESS-AMPLI-GAIN-HIGH alarm is raised when the actual gain of the OLS pluggable is higher than the configured gain value.

Clear the EGRESS-AMPLI-GAIN-HIGH Alarm

  1. Verify the RX and TX values and adjust the gain within the optimum working range.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

EGRESS-AUTO-LASER-SHUT

Default Severity: Not-Alarmed

Logical Object: Controller

The EGRESS-AUTO-LASER-SHUT alarm is raised when there is loss of signal (LOS) on the OTS line side (subport 1)

Clear the EGRESS-AUTO-LASER-SHUT Alarm

  1. Verify the fiber connections on the line side of the OLS pluggable.

  2. Verify the gain or power on the line side of the peer end.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).

EGRESS-AUTO-POW-RED

Default Severity: Not-Alarmed

Logical Object: Controller

The EGRESS-AUTO-POW-RED alarm is raised when there is loss of signal (LOS) on the OTS line side (subport 1)

Clear the EGRESS-AUTO-POW-RED Alarm

  1. Verify the fiber connections on the line side of the OLS pluggable.

  2. Verify the gain or power on the line side of the peer end.

If the alarm does not clear, log into the Technical Support Website at http://www.cisco.com/c/en/us/support/index.html for more information or call Cisco TAC (1 800 553-2447).