CISCO 400G Digital Coherent Optics User Guide

: June 1, 2024
: Cisco

Table of Contents

CISCO 400G Digital Coherent Optics
Configuring 400G Digital Coherent Optics
Configuring Frequency
Configuring Chromatic Dispersion
Configuring Optical Transmit Power
Configuring Muxponder Mode
Configuring FEC
Configuring Performance Monitoring
Configuring Alarms Threshold
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CISCO 400G Digital Coherent Optics

CISCO-400G-Digital-Coherent-Optics-product-image

CISCO-400G-Digital-Coherent-Optics-01

Configuring 400G Digital Coherent Optics

Table 1: Feature History Table

Feature Name	Release Information	Description
oFEC Traffic Configuration for QDD-400G-ZRP-S	Release 7.9.1	New Modulation

and DAC Rate traffic configurations are supported on

QDD-400G-ZRP-S optical module:

400G-TXP-1×1-16 QAM
4x100G-MXP-1×1-16 QAM
3x100G-MXP-1×1-8 QAM
2x100G-MXP-1×1-QPSK
2x100G-MXP-1×1.25-16 QAM
This increases the interoperability of the QDD-400G-ZRP-S optical module across network components supporting these formats.
From this release, the DP04QSDD-HE0 optical module is supported on the 8201-32FH and 8201-24H8FH routers.

Cisco offers a range of the new 400G Digital Coherent QSFP-DD optical modules. The optical modules that are available are:

QDD-400G-ZR-S
QDD-400G-ZRP-S

This chapter describes the QDD-400G-ZR-S, QDD-400G-ZRP-S optical modules and their supported configurations. The following fixed-port routers, line cards, from the indicated Cisco IOS XR software releases, support these optical modules.

Table 2: Fixed-Port Routers and Line Cards that Support QDD-400G-ZR-S, QDD- 400G-ZRP-S Optical Modules from Indicated Cisco IOS XR Software Releases

Fixed-Port Routers| Optics PID| Minimum IOS XR Software Release
---|---|---
Cisco 8201| QDD-400G-ZR-S| Release 7.3.15
QDD-400G-ZRP-S
Cisco 8202| QDD-400G-ZR-S| Release 7.3.15
QDD-400G-ZRP-S
8101-32FH| QDD-400G-ZR-S| Release 7.3.2
QDD-400G-ZRP-S
8201-32FH| QDD-400G-ZR-S| Release 7.3.2
QDD-400G-ZRP-S
8202-32FH-M| QDD-400G-ZR-S| Release 7.5.2
QDD-400G-ZRP-S
Line Cards| Optics PID| Minimum IOS XR Software Release
8800-LC-36FH| QDD-400G-ZR-S| Release 7.3.15
QDD-400G-ZRP-S
88-LC0-36FH-M| QDD-400G-ZR-S| Release 7.3.15
QDD-400G-ZRP-S
88-LC0-36FH| QDD-400G-ZR-S| Release 7.3.2
QDD-400G-ZRP-S
| QDD-400G-ZRP-S| Release 7.9.1

Note QDD-400G-ZR-S and QDD-400G-ZRP-S are not supported on 8102-64H fixed-port routers.
QDD-400G-ZRP-S and DP04QSDD-HE0 are not supported on odd-numbered ports of the following routers and line cards:

Cisco 8201
Cisco 8202
8800-LC-36FH
88-LC0-36FH-M

The QDD-400G-ZR-S and QDD-400G-ZRP-S optical modules enable wavelength- division multiplexing (WDM) functionality in the router. These optical modules are DWDM C-band (196.1 THz to 191.3 THz) tunable optical modules. They can be used in both transponder and muxponder modes.

Cisco IOS XR software creates optics and coherent DSP controllers to configure and monitor the performance of the QDD-400G-ZR-S and QDD-400G-ZRP-S optical modules. Optics controllers are used to configure and monitor optical parameters, such as frequency, chromatic dispersion, transmitted output power, modulation, and so on. Coherent DSP controllers are used to monitor network performance parameters like pre- and post-forward error correction (FEC) bit-error rate (pre-FEC BER, post-FEC BER), error corrected bits
(EC-BITS), and so on. Forward error correction (FEC) is configured using optical controllers and monitored using coherent DSP controllers.
The QDD-400G-ZR-S and QDD-400G-ZRP-S optical modules support traffic configuration and firmware download. The Cisco IOS XR software collects performance monitoring data and alarms using versatile DOM (VDM).

Due to more power consumption by the QDD-400G-ZR-S and QDD-400G-ZRP-S optical modules, the Cisco IOS XR software operates the fans at an higher speed to cool these optical modules.

The QDD-400G-ZR-S and QDD-400G-ZRP-S optical module configuration is divided into the following categories:
Traffic configuration – Comprises configuring DAC rate, muxponder mode, modulation, and FEC parameters. Applicable for optics controllers:
Configuring DAC Rate, on page 15
Configuring Muxponder Mode, on page 11
Configuring Modulation, on page 13
Configuring FEC, on page 17
Optical configuration – Comprises configuring frequency, chromatic dispersion, and optical transmit power. Applicable for optics controllers:
Configuring Frequency, on page 6
Configuring Chromatic Dispersion, on page 8
Configuring Optical Transmit Power, on page 10
Performance monitoring (PM) – Enables or disables performance monitoring in optical modules. You can also configure PM parameters that comprise signal power, chromatic dispersion, optical signal-to-noise ratio (OSNR), and differential group delay (DGD). Applicable for optics controllers and coherent DSP controllers:
Configuring Performance Monitoring, on page 19
Configuring PM Parameters, on page 19
Loopback configuration – Configures loopback. Applicable for coherent DSP controller:
Configuring Loopback, on page 18
Alarms threshold configuration – Configures thresholds for monitoring alarms that include optical signal-to-noise ratio (OSNR), differential group delay (DGD), chromatic dispersion (cd high and low), and so on. Applicable for optics controllers:
- Configuring Alarms Threshold, on page 23
The following table contains the possible traffic configuration values for the QDD-400G-ZR-S and QDD-400G-ZRP-S optical modules, in the transponder and muxponder mode:

Table 3: 400G Digital Coherent QSFP-DD Traffic Configuration Values

| QDD-400G-ZR-S| QDD-400G-ZRP-S
---|---|---
Client Speed| 1x400G, 4x100G|

1x400G, 4x100G, 3x100G,
2x100G, 1x100G
Note **** Release 7.3.15 supports only 1×400 and 4×100 client speed.

Trunk Speed| 400G|

400G
, 300G, 200G, 1×100
Note **** Release 7.3.15 supports only 400G trunk speed.

16QAM, 8QAM, QPSK
Release 7.3.15 supports only 16QAM.

DAC-Rate| 1×1| 1×1, 1×1.25, 1×1.50
Chromatic Dispersion (CD)| -2400 to +2400|

Release 7.3.15: -80000 to +80000
Release 7.3.2: -160000 to +160000

Transmitted (Tx) Power| Each optical module has its own transmitting (TX) power range. You can change the transmitting (TX) power value based on the module capability.| Each optical module has its own transmitting (TX) power optimal values. You can change the transmitting (TX) power value based on the module capability.

QDD-400G-ZR-S Transponder and Muxponder Configuration Values
The following table contains the possible Transponder and Muxponder configuration values for the QDD-400G-ZR-S optical module:
Table 4: QDD-400G-ZR-S Transponder and Muxponder Configuration Values

TXP/MXP| Client| Trunk| Modulation| FEC| DAC Rate
---|---|---|---|---|---
400G-TXP| 1 client, 400G speed| 1 trunk, 400G| 16 QAM| cFEC| 1×1
4x100G-MXP| 4 clients, 100G speed| 1 trunk, 400G| 16 QAM| FEC| 1×1

QDD-400G-ZRP-S Transponder and Muxponder Configuration Values
The following table contains the possible Transponder and Muxponder configuration values for the QDD-400G-ZRP-S optical module:

Table 5: QDD-400G-ZRP-S Transponder and Muxponder Configuration Values

TXP/MXP| Client| Trunk| Modulation| FEC| DAC Rate
---|---|---|---|---|---
400G-TXP| 1 Client, 400G speed| 1 trunk, 400G speed| 16 QAM| oFEC| 1×1.25
400G-TXP| 1 Client, 400G speed| 1 trunk, 400G speed| 16 QAM| oFEC| 1×1
400G-TXP| 1 Client, 400G speed| 1 trunk, 400G speed| 16 QAM| cFEC| 1×1
4x100G- MXP| 4 clients, 100G speed| 1 trunk, 400G speed| 16 QAM| oFEC| 1×1.25
4x100G-MXP| 4 Client, 100G speed| 1 trunk, 400G speed| 16 QAM| oFEC| 1×1
4x100G- MXP| 4 clients, 100G speed| 1 trunk, 400G speed| 16 QAM| cFEC| 1×1
3x100G-MXP| 3 clients, 100G speed| 1 trunk, 400G speed| 8 QAM| oFEC| 1×1.25
3x100G-MXP| 3 Client, 100G speed| 1 trunk, 400G speed| 8 QAM| oFEC| 1×1
2x100G-MXP| 2 clients, 100G speed| 1 trunk, 200G speed| QPSK| oFEC| 1×1.50
2x100G-MXP| 2 Client, 100G speed| 1 trunk, 400G speed| QPSK| oFEC| 1×1
2x100G-MXP| 2 Client, 100G speed| 1 trunk, 400G speed| 16 QAM| oFEC| 1×1.25
1x100G-MXP| 1 client, 100G speed| 1 trunk, 100G speed| QPSK| oFEC| 1×1.50

Configuring Frequency, on page 6
Configuring Chromatic Dispersion, on page 8
Configuring Optical Transmit Power, on page 10
Configuring Muxponder Mode, on page 11
Configuring Modulation, on page 13
Configuring DAC Rate, on page 15
Configuring FEC, on page 17
Configuring Loopback, on page 18
Configuring Performance Monitoring, on page 19
Configuring PM Parameters, on page 19
Configuring Alarms Threshold, on page 23

Configuring Frequency

You can configure frequency on optics controllers. You can select any C band frequency between the range 196.1 to 191.3 THz, in both ITU and NON-ITU channels.
Note
The 100MHz-grid keyword accepts only frequency values as user input. The 50GHz-grid keyword accepts frequency, ITU-channel, or wavelength values as user input. The Cisco IOS XR software then calculates the frequency for a given wavelength or ITU-channel.

Frequency Configuration Example

The following example shows how to configure frequency on the optics controller:
Router#config
Router(config)#controller optics 0/2/0/16
Router(config-Optics)#dwdm-carrier 100MHz-grid frequency 1921500 Router(config-Optics)#commit
Router(config-Optics)#exit
Router(config)#exit

Running Configuration

This example shows the running configuration:
Router#show run controller optics 0/2/0/16
Fri May 28 01:42:32.488 UTC
controller Optics0/2/0/16
dwdm-carrier 100MHz-grid frequency 1921500 cd-low-threshold -5000
cd-high-threshold -5000

Verification

This example shows how to verify the frequency configuration:
Router# show controller optics 0/2/0/16
Fri May 28 01:47:23.953 UTC
Controller State: Up
Transport Admin State: In Service Laser State: Off
LED State : Off
FEC State: FEC ENABLED

Optics Status

Optics Type: QSFPDD 400G ZRP
DWDM carrier Info: C BAND, MSA ITU Channel=80, Frequency=192.15THz, Wavelength=1560.200nm
Alarm Status:
Detected Alarms: None
LOS/LOL/Fault Status:

Alarm Statistics:

HIGH-RX-PWR = 0 LOW-RX-PWR = 0
HIGH-TX-PWR = 0 LOW-TX-PWR = 0
HIGH-LBC = 0 HIGH-DGD = 0
OOR-CD = 0 OSNR = 0
WVL-OOL = 0 MEA = 0
IMPROPER-REM = 0
TX-POWER-PROV-MISMATCH = 0
Laser Bias Current = 0.0 mA
Actual TX Power = -40.00 dBm
RX Power = -40.00 dBm
RX Signal Power = -40.00 dBm
Frequency Offset = 0 MHz
Laser Temperature = 0.00 Celsius
Laser Age = 0 %
DAC Rate = 1×1.25
Performance Monitoring: Enable
THRESHOLD VALUES
Parameter High Alarm Low Alarm High Warning Low Warning
Rx Power Threshold(dBm) 13.0 -24.0 10.0 -22.0
Tx Power Threshold(dBm) 0.0 -16.0 -2.0 -14.0
LBC Threshold(mA) 0.00 0.00 0.00 0.00
Temp. Threshold(celsius) 80.00 -5.00 75.00 0.00
Voltage Threshold(volt) 3.46 3.13 3.43 3.16
LBC High Threshold = 98 %
Configured Tx Power = -10.00 dBm
Configured CD High Threshold = -5000 ps/nm
Configured CD lower Threshold = -5000 ps/nm
Configured OSNR lower Threshold = 9.00 dB
Configured DGD Higher Threshold = 80.00 ps
Baud Rate = 60.1385459900 GBd
Modulation Type: 16QAM
Chromatic Dispersion 0 ps/nm
Configured CD-MIN -26000 ps/nm CD-MAX 26000 ps/nm
Second Order Polarization Mode Dispersion = 0.00 ps^2
Optical Signal to Noise Ratio = 0.00 dB
Polarization Dependent Loss = 0.00 dB
Polarization Change Rate = 0.00 rad/s
Differential Group Delay = 0.00 ps
Temperature = 21.00 Celsius
Transceiver Vendor Details
Form Factor : QSFP-DD
Optics type : QSFPDD 400G ZRP
Name : CISCO-ACACIA
OUI Number : 7c.b2.5c
Part Number : DP04QSDD-E30-19E
Rev Number : 10
Serial Number : ACA244900GN
PID : QDD-400G-ZRP-S
VID : ES03
Firmware Version : 161.06
Date Code(yy/mm/dd) : 20/12/08

Configuring Chromatic Dispersion

You can configure chromatic dispersion on optics controllers. When you configure the maximum and minimum values for chromatic dispersion for any data rate, ensure that the minimum difference between the configured values is equal to or greater than 1000 ps/nm.
The following table lists the default CD search range:

Table 6: Default CD Search Range

Muxponder Rate| FEC Value| Default CD Search Range (Min- Max)
---|---|---
400| OFEC| -26000 to +26000
400| CFEC| -2400 to +2400
300| OFEC| -50000 to +50000
200| OFEC| -50000 to +50000
100| OFEC| -80000 to +80000

Chromatic Dispersion Configuration Example
This example shows how to configure chromatic dispersion on the optics controller:
Router # configure
Router(config)#controller optics 0/0/0/13
Router(config-Optics)#cd-max 4000
Router(config-Optics)#cd-min -4000
Router(config-Optics)#commit
Router(config-Optics)#exit
Router(config)#exit
Running Configuration
This example shows the running configuration for the optics controller:
Router#show run controller optics 0/0/0/13
Thu May 13 12:24:42.353 UTC
controller Optics0/0/0/13
cd-max 4000 !

Verification

This example shows how to verify the configured chromatic dispersion values for the optics controller:
Router#show controller optics 0/0/0/13
Controller State : Up
Transport Admin State : In Service Laser State: On
LED State: Green
FEC State: FEC ENABLED
Optics Status
Optics Type: QSFPDD 400G ZR
DWDM carrier Info: C BAND, MSA ITU Channel=61, Frequency=193.10THz, Wavelength=1552.524nm
Alarm Status:
Detected Alarms: None
LOS/LOL/Fault Status:
Alarm Statistics:
HIGH-RX-PWR = 0 LOW-RX-PWR = 0
HIGH-TX-PWR = 0 LOW-TX-PWR = 0
HIGH-LBC = 0 HIGH-DGD = 0
OOR-CD = 0 OSNR = 35
WVL-OOL = 0 MEA = 0
IMPROPER-REM = 0
TX-POWER-PROV-MISMATCH = 0
Laser Bias Current = 0.0 %
Actual TX Power = -7.87 dBm
RX Power = -8.27 dBm
RX Signal Power = -8.43 dBm
Frequency Offset = 130 MHz
Performance Monitoring: Enable
THRESHOLD VALUES
Parameter High Alarm Low Alarm High Warning Low Warning
Rx Power Threshold(dBm) 1.9 -28.2 0.0 -25.0
Tx Power Threshold(dBm) 0.0 -15.0 -2.0 -16.0
LBC Threshold(mA) 0.00 0.00 0.00 0.00
Temp. Threshold(celsius) 80.00 -5.00 75.00 15.00
Voltage Threshold(volt) 3.46 3.13 3.43 3.16
LBC High Threshold = 98 %
Configured Tx Power = -6.00 dBm
Configured CD High Threshold = 80000 ps/nm
Configured CD lower Threshold = -80000 ps/nm
Configured OSNR lower Threshold = 9.00 dB
Configured DGD Higher Threshold = 80.00 ps
Baud Rate = 59.8437500000 GBd
Modulation Type: 16QAM
Chromatic Dispersion 0 ps/nm
Configured CD-MIN -4000 ps/nm CD-MAX 4000 ps/nm
Second Order Polarization Mode Dispersion = 5.00 ps^2
Optical Signal to Noise Ratio = 36.30 dB
Polarization Dependent Loss = 0.40 dB
Polarization Change Rate = 0.00 rad/s
Differential Group Delay = 4.00 ps
Temperature = 54.00 Celsius
Transceiver Vendor Details
Form Factor : QSFP-DD
Optics type : QSFPDD 400G ZR
Name : CISCO-ACACIA
OUI Number : 7c.b2.5c
Part Number : DP04QSDD-E20-19E
Rev Number : 10
Serial Number : ACA2447003L
PID : QDD-400G-ZR-S
VID : ES03
Firmware Version : 61.12
Date Code(yy/mm/dd) : 20/12/02

Configuring Optical Transmit Power

You can set the transmit power of the optical signal.
Each QDD-400G-ZR-S and QDD-400G-ZRP-S optical module has its own optical transmit (TX) power range. You can change the optical transmit (TX) power value based on the module capability. For

“Transmitter specifications”, see the Cisco 400G Digital Coherent Optics QSFP- DD Optical Modules Data Sheet.

Release 7.3.15 supports 4x100G muxponder mode or trunk speed.
The default optical transmit power (Tx) value is -10 dBm, however with Tx shaping enabled the maximum power in 1x400G, 4x100G, 3×100, 2x100G, and 1x100G modes may be less than -10 dBm.
Release 7.3.2 and future releases support 3x100G, 2x100G, and 1x100G muxponder modes or trunk speed.

Transmitting Power Configuration Example
The following example shows how to configure the optical transmit (TX) power on the optics controller:

Router#config
Router(config)#controller optics 0/2/0/16
Router(config-Optics)#transmit-power -125
Router(config-Optics)#commit
Router(config-Optics)#exit
Router(config)#exit
Running Configuration
This example shows the running configuration for the optics controller:
Router#show run controller optics 0/2/0/16
Thu May 13 12:52:35.020 UTC
controller Optics0/0/0/1
transmit-power -125

Verification

This example shows how to verify the configured optical transmit power for the optics controller:
Router#show controller optics 0/2/0/16
Fri May 28 02:52:06.182 UTC
Controller State : Up
Tr ansport Admin State: In Service Laser State: Off
LED State: Off
FEC State: FEC ENABLED

Optics Status

Optics Type : QSFPDD 400G ZRP
DWDM carrier Info : C BAND, MSA ITU Channel=80, Frequency=192.15THz, Wavelength=1560.200nm

Alarm Status:

Detected Alarms : None
LOS/LOL/Fault Status:
Alarm Statistics:
- HIGH-RX-PWR = 0 LOW-RX-PWR = 0
- HIGH-TX-PWR = 0 LOW-TX-PWR = 0
- HIGH-LBC = 0 HIGH-DGD = 0
- OOR-CD = 0 OSNR = 0
WVL-OOL = 0 MEA = 0
IMPROPER-REM = 0
TX-POWER-PROV-MISMATCH = 0
Laser Bias Current = 0.0 mA
Actual TX Power = -40.00 dBm
RX Power = -40.00 dBm
RX Signal Power = -40.00 dBm
Frequency Offset = 0 MHz
Laser Temperature = 0.00 Celsius
Laser Age = 0 %
DAC Rate = 1×1.25
Performance Monitoring: Enable

THRESHOLD VALUES

Parameter High Alarm Low Alarm High Warning Low Warning
Rx Power Threshold(dBm) 13.0 -24.0 10.0 -22.0
Tx Power Threshold(dBm) 0.0 -16.0 -2.0 -14.0
LBC Threshold(mA) 0.00 0.00 0.00 0.00
Temp. Threshold(celsius) 80.00 -5.00 75.00 0.00
Voltage Threshold(volt) 3.46 3.13 3.43 3.16
LBC High Threshold = 98 %
Configured Tx Power = -12.50 dBm
Configured CD High Threshold = -5000 ps/nm
Configured CD lower Threshold = -5000 ps/nm
Configured OSNR lower Threshold = 9.00 dB
Configured DGD Higher Threshold = 80.00 ps
Baud Rate = 60.1385459900 GBd
Modulation Type: 16QAM
Chromatic Dispersion 0 ps/nm
Configured CD-MIN -4000 ps/nm CD-MAX 4000 ps/nm
Second Order Polarization Mode Dispersion = 0.00 ps^2
Optical Signal to Noise Ratio = 0.00 dB
Polarization Dependent Loss = 0.00 dB
Polarization Change Rate = 0.00 rad/s
Differential Group Delay = 0.00 ps
Temperature = 20.00 Celsius
Voltage = 3.41 V
Transceiver Vendor Details
Form Factor : QSFP-DD
Optics type : QSFPDD 400G ZRP
Name : CISCO-ACACIA
OUI Number : 7c.b2.5c
Part Number : DP04QSDD-E30-19E
Rev Number : 10
Serial Number : ACA244900GN
PID : QDD-400G-ZRP-S
VID : ES03
Firmware Version : 161.06
Date Code(yy/mm/dd) : 20/12/08

Configuring Muxponder Mode

By default, the Cisco IOS XR software configures the QDD-400G-ZR-S and QDD-400G-ZRP-S optical modules in the 400G transponder mode.
Using the breakout muxponder mode command, you can configure muxponder mode on optics controllers. Based on the muxponder mode, you can choose the modulation.
Muxponder mode options available for QDD-400G-ZR-S are:
- 4×100
Muxponder mode options available for QDD-400G-ZRP-S are:
- 4×100
- 3×100
- 2×100
Note Release 7.3.15 supports only 4×100 muxponder mode.
See the following tables for the modulation values, based on the muxponder mode:
- QDD-400G-ZR-S Transponder and Muxponder Configuration Values, on page 4
- QDD-400G-ZRP-S Transponder and Muxponder Configuration Values, on page 5
Using the no breakout muxponder mode command, you can switch from the muxponder mode to the transponder mode, on optics controllers.

Muxponder Mode Configuration Example

The following example shows how to configure muxponder mode on the optics controller:
Router # config
Router(config)#controller optics 0/0/0/13
Router(config-Optics)#breakout 4×100
Router(config-Optics)#commit
Router(config-Optics)#exit
Router(config)#exit

Note
In the above example, the Cisco IOS XR software creates four Ethernet clients with 100GE speed, which can be verified using the show interfaces brief | include R/S/I/P command.

Running Configuration
This example shows the running configuration for the optics controller:
Router#show run controller optics 0/0/0/13
Thu May 13 12:24:42.353 UTC controller Optics0/0/0/13
cd-max 4000 breakout 4×100 !

Verification

This example shows how to verify the muxponder mode configuration:
Router#show interfaces brief | include 0/0/0/13
- Hu0/0/0/13/0 up up ARPA 1514 100000000
- Hu0/0/0/13/1 up up ARPA 1514 100000000
- Hu0/0/0/13/2 up up ARPA 1514 100000000
- Hu0/0/0/13/3 up up ARPA 1514 100000000

Transponder Mode Configuration Example

The following example shows how to switch to the transponder mode, on the optics controller:
Router # config
Router(config)#controller optics 0/0/0/13
Router(config-Optics)#no breakout 4×100
Router(config-Optics)#commit
Router(config-Optics)#exit
Router(config)#exit

Note
The Cisco IOS XR software creates a single 400GE interface, which can be verified using the show interfaces brief | include R/S/I/P command.

Running Configuration
This example shows the running configuration for the optics controller. The breakout configuration is absent in the running configuration.

Router#show run controller optics 0/0/0/13
Thu May 13 13:51:20.330 UTC
controller Optics0/0/0/13
cd-min -4000
cd-max 4000
transmit-power -100

Verification

This example shows how to verify the transponder mode configuration:
Router#show interfaces brief | include 0/0/0/13
FH0/0/0/13 up up ARPA 1514 400000000

Configuring Modulation
You can configure modulation on optics controllers. Based on the muxponder mode, you can choose the modulation

Note
The system accepts any modulation value that is entered. However, if the modulation value is outside the supported range, it is not configured on the optical module. Instead, the optical module is auto-configured with a valid modulation value. To view this value, use the show controller optics R/S/I/P command

See the following tables for the supported modulation values:

QDD-400G-ZR-S Transponder and Muxponder Configuration Values, on page 4
QDD-400G-ZRP-S Transponder and Muxponder Configuration Values, on page 5

Modulation Configuration Example

The following example shows how to configure modulation on the optics controller:
Router # config
Router(config)#controller optics 0/0/0/1
Router(config-Optics)#modulation 16Qam
Router(config-Optics)#commit
Router(config-Optics)#exit
Router(config)#exit
Running Configuration
This example shows the running configuration:
Router#show run controller optics 0/0/0/1
controller Optics0/0/0/1
cd-min -4000
cd-max 4000 transmit-power -100 modulation 16Qam

Note
Use the show controller optics R/S/I/P command to verify the modulation value of the optical module.

Verification
This example shows how to verify the configured modulation value for the optics controller:

Router#show controller optics 0/0/0/1
Controller State: Up
Transport Admin State: In Service Laser State: On
LED State: Green
FEC State: FEC ENABLED

Optics Status

Optics Type: QSFPDD 400G ZR
DWDM carrier Info: C BAND, MSA ITU Channel=61, Frequency=193.10THz, Wavelength=1552.524nm

Alarm Status:

Detected Alarms: None
LOS/LOL/Fault Status:
Alarm Statistics:
HIGH-RX-PWR = 0 LOW-RX-PWR = 0
HIGH-TX-PWR = 0 LOW-TX-PWR = 0
HIGH-LBC = 0 HIGH-DGD = 0
OOR-CD = 0 OSNR = 35
WVL-OOL = 0 MEA = 0
IMPROPER-REM = 0
TX-POWER-PROV-MISMATCH = 0
Laser Bias Current = 0.0 %
Actual TX Power = -7.87 dBm
RX Power = -8.27 dBm
RX Signal Power = -8.43 dBm
Frequency Offset = 130 MHz
Performance Monitoring: Enable
THRESHOLD VALUES

Parameter	High Alarm	Low Alarm	High Warning	Low Warning
Rx Power Threshold(dBm)	1.9	-28.2	0.0	-25.0
Tx Power Threshold(dBm)	0.0	-15.0	-2.0	-16.0
LBC Threshold(mA)	0.00	0.00	0.00	0.00
Temp. Threshold(celsius)	80.00	-5.00	75.00	15.00
Voltage Threshold(volt)	3.46	3.13	3.43	3.16
LBC High Threshold = 98 %

Configured Tx Power = -6.00 dBm
Configured CD High Threshold = 80000 ps/nm
Configured CD lower Threshold = -80000 ps/nm
Configured OSNR lower Threshold = 9.00 dB
Configured DGD Higher Threshold = 80.00 ps
Baud Rate = 59.8437500000 GBd
Modulation Type: 16QAM
Chromatic Dispersion 0 ps/nm
Configured CD-MIN -4000 ps/nm CD-MAX 4000 ps/nm
Second Order Polarization Mode Dispersion = 5.00 ps^2
Optical Signal to Noise Ratio = 36.30 dB
Polarization Dependent Loss = 0.40 dB
Polarization Change Rate = 0.00 rad/s
Differential Group Delay = 4.00 ps
Temperature = 54.00 Celsius
Voltage = 3.37 V
Transceiver Vendor Details
Form Factor : QSFP-DD
Optics type : QSFPDD 400G ZR
Name : CISCO-ACACIA
OUI Number : 7c.b2.5c
Part Number : DP04QSDD-E20-19E
Rev Number : 10
Serial Number : ACA2447003L
PID : QDD-400G-ZR-S
VID : ES03
Firmware Version : 61.12
Date Code(yy/mm/dd) : 20/12/02

Configuring DAC Rate
You can set the DAC (digital to analog conversion) sampling rate on optics controllers. You can modify the DAC sampling rate only on the QDD-400G-ZRP-S optical module.

Note
QDD-400G-ZR-S supports 1×1 dac-rate in cFEC mode. QDD-400G-ZRP-S supports 1×1 dac-rate in cFEC mode and 1×1.25 dac-rate in oFEC mode.

DAC Rate Configuration Example
The following example shows how to set the DAC rate on the optics controller:
Router#config
Router(config)#controller optics 0/0/0/1
Router(config-Optics)#dac-rate 1×1
Verification
This example shows the running configuration:
Router#show run controller optics 0/0/0/1
Thu May 13 12:52:35.020 UTC controller Optics0/0/0/1
- cd-min -4000
- cd-max 4000 transmit-power -100 modulation 16Qam DAC-Rate 1×1

Verification
This example shows how to verify the configured DAC rate for the optics controller:
Router#show controller optics 0/0/0/1

Controller State: Up
Transport Admin State: In Service
Laser State: On
LED State: Green
FEC State: FEC ENABLED
Optics Status
Optics Type: QSFPDD 400G ZR
DWDM carrier Info: C BAND, MSA ITU Channel=61, Frequency=193.10THz,
Wavelength=1552.524nm

Alarm Status:

Detected Alarms: None
LOS/LOL/Fault Status:
Alarm Statistics:
HIGH-RX-PWR = 0 LOW-RX-PWR = 0
HIGH-TX-PWR = 0 LOW-TX-PWR = 0
HIGH-LBC = 0 HIGH-DGD = 0
OOR-CD = 0 OSNR = 35
WVL-OOL = 0 MEA = 0
IMPROPER-REM = 0
TX-POWER-PROV-MISMATCH = 0
Laser Bias Current = 0.0 %
Actual TX Power = -7.87 dBm
RX Power = -8.27 dBm
RX Signal Power = -8.43 dBm
Frequency Offset = 130 MHz
DAC Rate = 1×1
Performance Monitoring: Enable
THRESHOLD VALUES

Parameter	High Alarm	Low Alarm	High Warning	Low Warning
Rx Power Threshold(dBm)	1.9	-28.2	0.0	-25.0
Tx Power Threshold(dBm)	0.0	-15.0	-2.0	-16.0
LBC Threshold(mA)	0.00	0.00	0.00	0.00
Temp. Threshold(celsius)	80.00	-5.00	75.00	15.00
Voltage Threshold(volt)	3.46	3.13	3.43	3.16
LBC High Threshold = 98 %

Configured Tx Power = -6.00 dBm
Configured CD High Threshold = 80000 ps/nm
Configured CD lower Threshold = -80000 ps/nm
Configured OSNR lower Threshold = 9.00 dB
Configured DGD Higher Threshold = 80.00 ps
Baud Rate = 59.8437500000 GBd
Modulation Type: 16QAM
Chromatic Dispersion 0 ps/nm
Configured CD-MIN -4000 ps/nm CD-MAX 4000 ps/nm
Second Order Polarization Mode Dispersion = 5.00 ps^2
Optical Signal to Noise Ratio = 36.30 dB
Polarization Dependent Loss = 0.40 dB
Polarization Change Rate = 0.00 rad/s
Differential Group Delay = 4.00 ps
Temperature = 54.00 Celsius
Voltage = 3.37 V
Transceiver Vendor Details
Form Factor : QSFP-DD
Optics type : QSFPDD 400G ZR
Name : CISCO-ACACIA
OUI Number : 7c.b2.5c
Part Number : DP04QSDD-E20-19E
Rev Number : 10
Serial Number : ACA2447003L
PID : QDD-400G-ZR-S
VID : ES03
Firmware Version : 61.12
Date Code(yy/mm/dd) : 20/12/02

Configuring FEC

You can configure forward error correction (FEC) only on optics controllers. You can modify FEC only on the QDD-400G-ZRP-S optical module. FEC is a feature that is used for controlling errors during data transmission. This feature works by adding data redundancy to the transmitted message using an algorithm.
This redundancy allows the receiver to detect and correct a limited number of errors occurring anywhere in the message, instead of having to ask the transmitter to resend the message.

Note
QDD-400G-ZR-S supports cFEC (concatenated forward error correction). QDD- 400G-ZRP-S supports cFEC and oFEC (open forward error correction).

FEC Configuration Example

The following sample shows how to configure FEC on the optics controller:
Router#configure
Router(config)#controller optics 0/0/0/13
Router(config-Optics)#fec CFEC
Router(config-Optics)#commit
Router(config-Optics)#exit
Router(config)#exit
Running Configuration
This example shows the running configuration:
Router#show controllers optics 0/0/0/13
controller Optics0/0/0/1
cd-min -4000
cd-max 4000
transmit-power -100 fec CFEC modulation 16Qam
DAC-Rate 1×1.25

Verification

This example shows how to verify the FEC configuration for the optics controller:
Router#show controller coherentdsp 0/0/0/13
Thu May 27 17:28:51.960 UTC
Port : CoherentDSP 0/0/0/13
Controller State : Down
Inherited Secondary State : Normal
Configured Secondary State : Maintenance
Derived State : Maintenance
Loopback mode : Internal
BER Thresholds : SF = 1.0E-5 SD = 1.0E-7
Performance Monitoring : Enable
Bandwidth : 400.0Gb/s

Alarm Information:

LOS = 6 LOF = 0 LOM = 0
OOF = 0 OOM = 0 AIS = 0
IAE = 0 BIAE = 0 SF_BER = 0
SD_BER = 0 BDI = 0 TIM = 0
FECMISMATCH = 0 FEC-UNC = 0 FLEXO_GIDM = 0
FLEXO-MM = 0 FLEXO-LOM = 0 FLEXO-RDI = 0
FLEXO-LOF = 5
Detected Alarms : LOS

Bit Error Rate Information

PREFEC BER : 5.0E-01
POSTFEC BER : 0.0E+00
Q-Factor : 0.00 dB
Q-Margin : -7.20dB
OTU TTI Received
FEC mode : C_FEC

Configuring Loopback

You can configure internal or line loopback on coherent DSP controllers. Loopback can be performed only in the maintenance mode.
Note
- Line loopback mode is supported only on Cisco 8000 series line cards and fixed-port routers based on Q100 and Q200 silicon.

Loopback Configuration Example

This example shows how to enable internal loopback configuration on coherent DSP controllers:
Router#config
Router(config)#controller coherentDSP 0/0/0/4
Router(config-CoDSP)#secondary-admin-state maintenance
Router(config-CoDSP)#loopback internal
Router(config-CoDSP)#commit
Running Configuration
This example shows the running configuration on coherent DSP controllers:
Router#show run controller coherentdsp 0/0/0/4
Thu May 13 19:51:08.175 UTC controller CoherentDSP0/0/0/4 secondary-admin-state maintenance loopback internal

Verification

This example shows how to verify the loopback configuration on coherent DSP controllers:
Router#show controller coherentdsp 0/0/0/4
Thu May 27 17:28:51.960 UTC
Port : CoherentDSP 0/0/0/4
Controller State : Down
Inherited Secondary State : Normal
Configured Secondary State : Maintenance
Derived State : Maintenance
Loopback mode : Internal
BER Thresholds : SF = 1.0E-5 SD = 1.0E-7
Performance Monitoring : Enable
Bandwidth : 400.0Gb/s

Alarm Information:

LOS = 6 LOF = 0 LOM = 0
OOF = 0 OOM = 0 AIS = 0
IAE = 0 BIAE = 0 SF_BER = 0
SD_BER = 0 BDI = 0 TIM = 0
FECMISMATCH = 0 FEC-UNC = 0 FLEXO_GIDM = 0
FLEXO-MM = 0 FLEXO-LOM = 0 FLEXO-RDI = 0
FLEXO-LOF = 5
Detected Alarms : LOS
Bit Error Rate Information
PREFEC BER : 5.0E-01
POSTFEC BER : 0.0E+00
Q-Factor : 0.00 dB
Q-Margin : -7.20dB
OTU TTI Received
FEC mode : C_FEC

Configuring Performance Monitoring

Performance monitoring (PM) parameters are used by service providers to gather, store, set thresholds for, and report performance data for early detection of problems. The user can retrieve both current and historical PM counters for the various controllers in 30-second, 15-minute, and 24-hour intervals.
Performance monitoring can be configured on optics controllers and coherent DSP controllers.
To stop performance monitoring on optics or coherent DSP controllers, use the perf-mon disable keyword.

Configuring PM Parameters

The performance monitoring (PM) threshold and the threshold crossing alert (TCA) reporting status can be configured for optics controllers and coherent DSP controllers:
Table 7: PM Thresholds and TCA Report Status for Optics Controllers

PM Parameters	Description
CD	Sets the CD (chromatic dispersion) threshold or TCA reporting status.
DGD	Sets the DGD (differential group delay) threshold or TCA reporting

status.
LBC| Sets the LBC (laser bias current) threshold or TCA reporting status in mA.
FREQ-OFF| Sets the FREQ-OFF (low signal frequency offset) threshold or TCA reporting status in Mhz.
PM Parameters| Description
---|---
OPR| Sets the OPR (optical power RX) threshold or TCA reporting status in uW or dbm.
OPT| Sets the OPT (optical power TX) threshold or TCA reporting status in uW or dbm.
OSNR| Sets the OSNR (optical signal-to-noise ratio) threshold or TCA reporting status.
PCR| Sets the PCR (polarization change rate) threshold or TCA reporting status.
PDL| Sets the PDL (polarization dependent loss) threshold or TCA reporting status.
RX-SIG| Sets the RX-SIG (receiving signal power) threshold or TCA reporting status in uW or dbm.
SNR| Sets the SNR (signal-to-noise ratio) threshold or TCA reporting status.
SOPMD| Sets the SOPMD (second order polarization mode dispersion) threshold or TCA reporting status.

Table 8: PM Thresholds TCA Report Status for Coherent DSP Controllers

PM Parameters	Description
Q	Sets the Q threshold or TCA reporting status.
Q-margin	Sets the Q margin threshold or TCA reporting status.
EC-BITS	Sets the EC-BITS (error corrected bits) threshold or TCA reporting

status.
PostFEC BER| Sets the post-FEC BER threshold or TCA reporting status.
PreFEC BER| Sets the pre-FEC BER threshold or TCA reporting status.
UC-WORDS| Sets the UC-WORDS (uncorrected words) threshold or TCA reporting status.
PM Parameters| Description
---|---
Host-Intf-0-FEC-BER| Sets the Host-Intf-0-FEC-BER threshold or TCA reporting status, where:

AVG – specifies the number of corrected bits received from the host interface prior to a PM interval.
MIN – specifies the minimum number of corrected bits received from the host interface over a sub-interval and prior to a PM interval.
MAX – specifies the maximum number of corrected bits received from the host interface over a sub-interval and prior to a PM interval.

Host-Intf-0-FEC-FERC| Sets the Host-Intf-0-FEC-FERC threshold or TCA reporting status, where:

AVG – specifies the number of frames received from the host interface during a sub-interval.
MIN – specifies the minimum number of frames received from the host interface with uncorrected errors over a sub-interval and prior to a PM interval.
MAX – specifies the maximum number of frames received from the host interface with uncorrected errors over a sub-interval and prior to a PM interval.
Performance Monitoring Configuration Example
This example shows how to enable performance monitoring and set PM thresholds on the optics controller:
Router#config
Router(config)#controller optics 0/2/0/16
Router(config-Optics)#perf-mon enable
Router(config-Optics)#pm 30-sec optics threshold cd max 100
Router(config-Optics)#pm 30-sec optics threshold cd min -100
Router(config-Optics)#commit
Running Configuration
This example shows the running configuration on optics controllers:
Router#show run controller optics 0/2/0/16
Thu May 13 20:18:55.957 UTC controller Optics0/2/0/16
pm 30-sec optics threshold cd max 100
pm 30-sec optics threshold cd min -100 perf-mon enable
Verification

This example shows how to verify the PM parameters on optics controllers. Verify the configuration changes in the Configured Threshold fields:

Router#show controller optics 0/2/0/16 pm current 30-sec optics 1
Thu May 27 17:58:49. 889 UTC
Optics in the current interval [17:58:30 – 17:58:49 Thu May 27 2021]
Optics current bucket type : Valid

MIN

Configured

| AVG

TCA

| MAX| Operational| Configured| TCA| Operational
---|---|---|---|---|---|---
Threshold(min) Threshold(min) (min) Threshold(max)

Threshold(max) (max)

LBC[mA ]| | : 0.0| 0.0| 0.0| 0.0| NA| NO| 100.0
| NA| | NO| | | | |
OPT[dBm]     :| -9.98| -9.98| -9.98| -15.09| NA| | | NO   0.00
NA| | NO| | | | | |
OPR[dBm]     :| -40.00| -40.00| -40.00| -30.00| NA| | | NO   8.00
NA| | NO| | | | | |
CD[ps/nm]    :| 0| 0| 0| -80000| -100| NO| | 100
100| NO| | | | | | |
DGD[ps ]     :| 0.00| 0.00| 0.00| 0.00| NA| | | NO   80.00
NA| | NO| | | | | |
SOPMD[ps^2] :| 0.00| 0.00| 0.00| 0.00| NA| | | NO   2000.00
NA| | NO| | | | | |
OSNR[dB]     :| 0.00| 0.00| 0.00| 0.00| NA| | | NO   40.00
NA| | NO| | | | | |
PDL[dB]      :| 0.00| 0.00| 0.00| 0.00| NA| | | NO   7.00
NA| | NO| | | | | |
PCR[rad/s]   :| 0.00| 0.00| 0.00| 0.00| NA| | NO| 2500000.00
NA| | NO| | | | | |
RX_SIG[dBm] :| -40.00| -40.00| -40.00| -30.00| NA| | | NO   1.00
NA| | NO| | | | | |
FREQ_OFF[Mhz]:| 0| 0| 0| -3600| NA| | | NO   3600
NA| | NO| | | | | |
SNR[dB]      :| 0.00| 0.00| 0.00| 7.00| NA| | | NO   100.00
NA| | NO| | | | | |

Performance Monitoring Configuration Example
This example shows how to enable performance monitoring and set PM thresholds and TCA reporting status on the coherent DSP controller:

Router#config
Router(config)#controller CoherentDSP0/2/0/16
Router(config-CoDSP)#perf-mon enable
Router(config-CoDSP)#pm 30-sec fec report Q max-tca enable
Router(config-CoDSP)#pm 30-sec fec report Q-margin max-tca enable
Router(config-CoDSP)#pm 30-sec fec report Q min-tca enable
Router(config-CoDSP)#pm 30-sec fec report Q-margin min-tca enable
Router(config-CoDSP)#pm 30-sec fec threshold Q max 1200
Router(config-CoDSP)#pm 30-sec fec threshold Q-margin max 500
Router(config-CoDSP)#pm 30-sec fec threshold Q min 900
Router(config-CoDSP)#pm 30-sec fec threshold Q-margin min 280
Router(config-CoDSP)#commit
Running Configuration
This example shows the running configuration on coherent DSP controllers:
Router#show run controller coherentdsp 0/2/0/16
Thu May 13 19:56:09.136 UTC controller CoherentDSP0/2/0/16 pm 30-sec fec report Q max-tca enable
pm 30-sec fec report Q-margin max-tca enable
pm 30-sec fec report Q min-tca enable
pm 30-sec fec report Q-margin min-tca enable
pm 30-sec fec threshold Q max 1200
pm 30-sec fec threshold Q-margin max 500
pm 30-sec fec threshold Q min 900
pm 30-sec fec threshold Q-margin min 280
perf-mon enable

Verification
This example shows how to verify the PM parameters on coherent DSP controllers. Verify the configuration changes in the highlighted fields:

Router#show controllers coherentdsp 0/2/0/16 pm current 30-sec fec Thu May 27 23:04:54.167 UTC g709 FEC in the current interval [23:04:30 – 23:04:54 Thu May 27 2021] FEC current bucket type : Valid

CISCO-400G-Digital-Coherent-Optics-02

Configuring Alarms Threshold

The alarms threshold can be configured for monitoring alarms on optics controllers:
Table 9: Alarms Threshold Parameters for Optics Controllers

Alarm Threshold Parameters	Description
CD	Sets the CD (chromatic dispersion) alarm threshold (cd-low-threshold and

cd-high-threshold).
DGD| Sets the DGD (differential group delay) alarm threshold.
LBC| Sets the LBC (laser bias current) threshold in mA.
OSNR| Sets the OSNR (optical signal-to-noise ratio) alarm threshold.

Alarm Threshold Configuration Example
This example shows how to configure alarm threshold on the optics controller:

Router#config
Router(config)#controller optics 0/2/0/16
Router(config-Optics)#cd-low-threshold -2000
Router(config-Optics)#cd-high-threshold 2000
Router(config-Optics)#commit
Running Configuration
This example shows the running configuration on the optics controller:
Router#show run controller optics 0/2/0/16
Thu May 13 20:18:55.957 UTC controller Optics0/2/0/16
cd-low-threshold 2000
cd-high-threshold 2000

Verification

This example shows how to verify the alarm threshold on optics controllers:
Router#show controller optics 0/2/0/16
Fri May 28 01:04:33.604 UTC
Controller State: Up
Transport Admin State: In Service Laser State: Off
LED State: Off
FEC State: FEC ENABLED

Optics Status

Optics Type: QSFPDD 400G ZRP
DWDM carrier Info: C BAND, MSA ITU Channel=61, Frequency=193.10THz, Wavelength=1552.524nm

Alarm Status:

Detected Alarms: None
LOS/LOL/Fault Status:

Alarm Statistics:

HIGH-RX-PWR = 0 LOW-RX-PWR = 0
HIGH-TX-PWR = 0 LOW-TX-PWR = 0
HIGH-LBC = 0 HIGH-DGD = 0
OOR-CD = 0 OSNR = 0
WVL-OOL = 0 MEA = 0
IMPROPER-REM = 0
TX-POWER-PROV-MISMATCH = 0
Laser Bias Current = 0.0 mA
Actual TX Power = -40.00 dBm
RX Power = -40.00 dBm
RX Signal Power = -40.00 dBm
Frequency Offset = 0 MHz
Laser Temperature = 0.00 Celsius
Laser Age = 0 %
DAC Rate = 1×1.25
Performance Monitoring: Enable
THRESHOLD VALUES

Parameter	High Alarm	Low Alarm	High Warning	Low Warning
Rx Power Threshold(dBm)	13.0	-24.0	10.0	-22.0
Tx Power Threshold(dBm)	0.0	-16.0	-2.0	-14.0
LBC Threshold(mA)	0.00	0.00	0.00	0.00
Temp. Threshold(celsius)	80.00	-5.00	75.00	0.00
Voltage Threshold(volt)	3.46	3.13	3.43	3.16
LBC High Threshold = 98 %