QSFP-DD is a new module developed but with the same form factor as the current QSFP, to support high-speed solutions. It provides eight lanes electrical interface. Each lane can operate up to 25Gbps NRZ modulation or 50Gbps PAM4 modulation. QSFP modules are designed to be backward compatible with the existing QSFP modules.

Basically, the system will be developed to support 400Gbps data transmission. This will enable us to support the high-speed solution. The management interface will be used to get the status and control of the module.

CMIS modules have two physical interfaces for signal transmission:

The host interface is the high-speed electrical interface between the module and the host system. The host interface carries signals traveling from host to module (transmitter input signals) and signals traveling from module to host (receiver output signals). All electrical signals carried over the host interface are transmitted over the wire pairs, each of which is called host lanes.

The media interface is the high-speed electrical/optical interface between the module and the interconnecting media. The media interface carries signals that travel from module to media (transmitter output signals) and signals that travel from media to module (receiver input signals). Media interface signals are carried either over electrical wire pairs (Copper cables) or over optical wavelengths on physical fibers, which are called media lanes.

The objective of this document is to provide a high-speed solution using QSFP-DD. The management characteristics, status, and control of QSFP-DD.

Use this command to configure the loopback type (input, output, both) on the QSFP-DD module host/media side. If the loopback type is supported by the QSFP-DD module this will enable the loopback function.

Use this command to configure the input loopback type on the QSFP-DD module media side. If the loopback type is supported by the QSFP-DD module this will enable the loopback function.

Use this command to configure the output loopback type on the QSFP-DD module media side. If the loopback type is supported by the QSFP-DD module this will enable the loopback function.

Use this command to configure the both loopback type on the QSFP-DD module media side. If the loopback type is supported by the QSFP-DD module this will enable the loopback function.

Use this command to configure the input loopback type on the QSFP-DD module host side. If the loopback type is supported by the QSFP-DD module this will enable the loopback function.

Use this command to configure the output loopback type on the QSFP-DD module host side. If the loopback type is supported by the QSFP-DD module this will enable the loopback function.

Use this command to configure the both loopback type on the QSFP-DD module Host side. If the loopback type is supported by the QSFP-DD module this will enable the loopback function.

Use these commands to configure the PRBS pattern generator/checker type to be used for diagnostics of the QSFP-DD module host/media side and to configure the PRBS pattern generator/checker location (pre-fec/post-fec) on the QSFP-DD module host/media side. If the generator/checker pattern type and location are supported by the QSFP-DD module this will enable the selected function.

Use the no parameter to remove this configuration and disable the generator/checker function.

Use this command to select the application ID to be configured for this QSFP-DD module.

a. Example of valid combinations:

b. Example of invalid combinations:

2. When host interface ID bandwidth is lower than media interface ID bandwidth, for some cases only one breakout
interface is possible

a. Example of valid combinations:

b. Example of invalid combinations:

The QSFP-DD introduces the following commands to configure custom applications for both host and media interface ID.

Use this command to set the custom application host interface ID while using the port breakout for 400G transceivers.

None

None

Introduced in OcNOS 6.5.3.

Use this command to set the custom application media interface ID while using the port breakout for 400G transceivers.

None

None

Introduced in OcNOS 6.5.3.

Laser Tuning only supports for tunable Transceivers.

Use this command to configure the Laser Grids in the QSFP-DD port. These commands only supports for modules which supports for laser Tuning Transceivers.

Use this command to configure the Laser Channel in the QSFP-DD port. Using Channel Number we can set different Frequency and Wavelength for that port .Every Laser Grid have their own Channel Numbers. These commands only supports for modules which supports for laser Tuning Transceivers.

Use this command to configure the Laser fine-tune-freq in the QSFP-DD port. These commands only supports for modules which supports for laser Tuning Transceivers.

Use this command to configure the Laser output-power in the QSFP-DD port. These commands only supports for modules which supports for laser Tuning Transceivers.

Use this command to configure the Laser Grids in the media-lane. These commands only supports for modules which supports for laser Tuning Transceivers.

Use this command to configure the Laser Channel in the media-lane. Using Channel Number we can set different Frequency and Wavelength for that port .Every Laser Grid have their own Channel Numbers. These commands only supports for modules which supports for laser Tuning Transceivers.

Use this command to configure the Laser fine-tune-freq in the media-lane. These commands only supports for modules which supports for laser Tuning Transceivers.

Use this command to configure the Laser output-power in the media-lane. These commands only supports for modules which supports for laser Tuning Transceivers.

 

Given a few examples of Alarms.

For Rx Optical Power & Rx Los:

For TX LOS & TX Cdr Loss:

Local Fault: A local fault occurs when there is an issue with the line port, indicating a problem detected at the local end, such as bad data or signal.

Remote Fault: A remote fault is triggered when a port receives a remote fault frame from the far end (the port experiencing the local fault).

To address these faults, perform the "Shut/No Shut" operation at the interface level after enabling logging levels on the DUT (Device Under Test). Configure the "create-subscription" in the Netconf terminal, and to generate SNMP traps, connect the DUT to an MIB browser or a Linux server. Once configured, the "Shut" operation can be executed to generate alarms, and the "No Shut" operation can be used to recover from those alarms. Below, we have highlighted some alarms and their corresponding recovery processes in CLMSH mode, Netconf mode, and via SNMP traps.

Perform the Shut operation on the interface level to generate the alarms. To validate the remote fault and local fault alarms, use the following commands.

Enter configuration commands, one per line. End with CNTL/Z.

The Signal integrity in the context of Quad Small Form Factor Pluggable Double Density (QSFP-DD) refers to the maintenance of the quality of electrical signals transmitted and received by the QSFP-DD module. QSFP-DD is a high-speed, high-density interface used primarily in data center applications to interconnect switches, servers, and other networking equipment.

Maintaining signal integrity is crucial in high-speed data transmission because any degradation or distortion of the signals can lead to errors, reduced performance, or even complete failure of communication between devices. In the case of QSFP-DD, which supports data rates of up to 400 Gbps per port, ensuring signal integrity is particularly challenging due to the high data rates and the compact form factor of the module.

The signal integrity involves addressing various factors such as impedance matching, jitter, noise, reflections, and equalization to ensure the accurate and reliable transmission of electrical signals in electronic systems.

Optimizing signal integrity in QSFP-DD modules offers numerous benefits:

To configure Signal Integrity (SI) parameters like Rx Pre-Cursor Equalization, Rx Post-Cursor Equalization, Tx Equalization, and Rx Amplitude on a QSFP-DD module, you usually interact with the management interface or CLI provided by the networking equipment hosting the module. This involves accessing the configuration settings specific to the QSFP-DD module within the device's interface.

In this topology, the Signal Integrity RTR1 to RTR2 interface configuration in QSFP-DD.

For the Tx equalization configuration in R1 route, follow these steps:

To validate the Tx equalization configuration, use the following command.

For the Tx equalization configuration in R2 route, follow these steps:

To validate the Tx equalization configuration, use the following command.

For the Tx equalization unconfiguration in R2 route, follow these steps:

To validate the Tx equalization unconfiguration, use the following command.

To configure the Tx Equalization on any specific host lanes, do the following configuration.

For the Tx equalization configuration on any specific host lanes, follow these steps:

To validate the Tx equalization configuration, use the following command.

For the Tx equalization configuration in R2 route, follow these steps:

To validate the Tx equalization configuration, use the following command.

For the Tx equalization unconfiguration on any specific host lanes, follow these steps:

To validate the Tx equalization unconfiguration, use the following command.

Use this command to configure the Rx Amplitude on the QSFP-DD module on all eight host lanes, follow these steps.

To validate the Rx amplitude configuration, use the following command.

 

OcNOS#

Use this command to configure the Rx Amplitude on the QSFP-DD module on all eight host lanes, follow these steps.

To validate the Rx amplitude configuration, use the following command.

For the Rx amplitude unconfiguration, follow these steps.

To validate the Rx amplitude unconfiguration, use the following command.

To configure the Rx Amplitude on any specific host lanes, do the following configuration.

Use this command to configure the Rx Amplitude on the QSFP-DD module on any specific host lanes, follow these steps.

To validate the Rx amplitude configuration, use the following command.

Use this command to configure the Rx Amplitude on the QSFP-DD module on all eight host lanes, follow these steps.

To validate the Rx amplitude configuration, use the following command.

For the Rx amplitude unconfiguration, follow these steps.

To validate the Rx amplitude unconfiguration, use the following command.

Use this command to configure the Rx Pre-Cursor Eq on the QSFP-DD module on all eight host lanes, follow these steps.

To validate the Rx Pre-Cursor Eq configuration, use the following command.

Use this command to configure the Rx Pre-Cursor Eq on the QSFP-DD module on all eight host lanes, follow these steps.

To validate the Rx Pre-Cursor Eq configuration, use the following command.

Use this command to unconfigure the Rx Pre-Cursor Eq on the QSFP-DD module on all eight host lanes, follow these steps.

To validate the Rx Pre-Cursor Eq Unconfiguration, use the following command.

To configure the Rx Pre-Cursor Eq on any specific host lanes, do the following configuration.

Use this command to configure the Rx Pre-Cursor Eq on the QSFP-DD module on any specific host lanes, follow these steps.

To validate the Rx Pre-Cursor Eq configuration, use the following command.