What are the functions of the eUSB card of the S12700

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The S12700 series switches support standard eUSB cards. The default capacity of an eUSB card is 2 GB, expandable to 4 GB or 8 GB. The eUSB card is used to store system files, configuration files, paf, License, and log files.

The S12700 series switches can start by using the startup file in the eUSB card. In this case, the system software package is stored on the eUSB card. It is required to specify the system software package on the eUSB card as the boot file.

On the S12700 series switches, logs can be stored on the eUSB cards.

Do not use the uncertified eUSB cards to prevent unpredictable problems.

Other related questions:
How does the S12700 write logs to eUSB card
The logs are cached instead of being immediately written into the log files on the eUSB card. The S12700 supports two methods to write the logs: On the S12700, the cache can store 33 KB logs. When the cache is full, the logs are written into the log file on the eUSB card. You can also store logs to the eUSB card manually. That is, run the save logfile command in the user view. The information in the cache can be immediately written into the log file on the eUSB card. NOTE: Before providing the logs to R&D, import the logs into log files.

Functions of ports on CSS subcards
CSS subcards provide 10GBASE-X SFP+ optical ports for sending and receiving service packets as well as providing CSS services. You can refer to the following documents for the detailed CSS connection rules: For the hardware description of the S9300 and S9300E, see S9300&S9300E Hardware Description. For the hardware description of the S7700, see S7700 Hardware Description. For the hardware description of the S9700, see S9700 Hardware Description. For the hardware description of the S12700, see S12700 Hardware Description.

SFU functions of S12700 switches
The ET1D2SFU provides the data plane for the entire system. The data plane provides high-speed, non-blocking data channels for data switching between service modules. The ET1D2SFU consists of the following functional modules: - Switching module: functions as the data plane and provides high-speed service channels for data switching. - Local clock module: provides the working clock for the chips of the switching module, management module, and monitoring module on the ET1D2SFU. - Power module: provides power supply for the ET1D2SFU. For the hardware description of S12700 switches, see S12700 Hardware Description.

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