Application select code provisioning
Application select code, also known as AppSel code, is a feature that:
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allows the host device to choose the operating mode of a QDD module
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allows you to configure the media code, and
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specifies how to configure the optical side of a module.
Common Management Interface Specification
The Common Management Interface Specification (CMIS) specifications set rules for how QDD modules work and how a host device sets them up. CMIS provides a consistent way for host devices, such as routers or switches, to communicate with and control optical modules, regardless of the module manufacturer.
Understanding AppSel codes and module operation modes
Each QDD module can operate in different modes, identified by a unique AppSel code. This code acts like a unique ID for each mode. Each mode has an application descriptor, which explains how the module handles data. It describes how signals are processed between the connections on the host side and the optical side.
The optical side is also known as the media side of the module. The AppSel code includes a media code, which tells the module how to set up its optical side. The host software uses this media code to control the module’s optical interface. The host software also sets up other components, like the physical layer (PHY), SerDes, and MacPort, to complete the data path.
AppSel code storage and compatibility
Modules store a list of the AppSel codes they support in their EEPROM memory. This helps the host system or device know which settings the module can use. Some codes, like 400G-OIF-ZR and 400G-OpenZR+, are standard and follow industry rules. Other codes are custom, created by third-party vendors to provide users with more options on a single module. These custom codes may cause compatibility problems; for instance, Cisco routers may not function properly with modules using unrecognized custom codes.
Application mode selection
This feature allows users to select from all application modes advertised by the optical module. You can choose all application modes a module supports.
AppSel operation mode parameters
AppSel supports operation modes based on these parameters:
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Data rate, such as 100GE or 400GE
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Signal type
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Signal processing between host side and media side
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Optical configuration, based on the media code, which is part of the AppSel code.
Supported card and pluggables
In Release 25.3.1, AppSel is supported on the DP04QSDD-ULH-A1 pluggable connected to the QXP-K9 card.
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