Why only two optical interfaces are displayed after a front card is installed on an S5700

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The reason is that no extended rear card is installed on the S5700.
An S5700-EI or S5700-SI can provide only two optical interfaces for a front card. If a 4-port front card is installed, an ETPB extended rear card must be installed to provide the other two ports. Otherwise, only two optical interfaces are displayed.

Other related questions:
Whether front cards and rear stack cards can be used together on S series fixed switches
S5700-EI, S5710-LI, and S5700-C-SI series fixed switches have front and rear card slots. Font card slots can have 2-port or 4-port service interface cards installed. Rear card slots can have stack cards or extended channel cards installed. The rules are as follows: -- A 4-port ES5D000G4S01 or ES5D00G4SA01 GE front card and a 4-port ES5D000X4S01 10GE front card must be used with an ES5D00ETPB00 rear extended channel card; otherwise, only two ports on the 4-port front card can work. -- If an ES5D000G4S01 or ES5D00G4SA01 front card is used with an ES5D00ETPC00 rear stack card on an S5700-EI, S5700-SI, or S5710-C-LI switch, only the first two ports on the front card can work when the switch is working normally. If the ES5D000X4S01 front card is used, only ports 1 and 3 are available. --The ES5D00ETPB00 card used with the ES5D000X4S01 front card must have a PCB of version C. -- The S5700-EI switch that uses the ES5D000X4S01 front card must have a PCB of version B or later (version C on S5700-52C-EI). You can run the display version command to check the PCB version of a switch. For details about cards, see the Hardware Description. For the hardware description of S5700 switches, see S5700 Hardware Description. For the hardware description of S6700 switches, see S6700 Hardware Description.

Why auto-negotiation cannot be configured after a 100M optical module is installed and then removed from a 100M/1000M optical interface on the S5700
On S5700 switches in versions earlier than V200R001, the default rate of 100M/1000M optical interfaces is 1000 Mbit/s. After a 100M optical module is installed on an optical interface, the optical interface automatically changes the rate to 100 Mbit/s. After the optical module is removed, the optical interface retains the 100 Mbit/s rate. When the rate of an optical interface is 100 Mbit/s, the interface does not support auto-negotiation. The auto-negotiation function cannot be configured. You can run the speed 1000 command or install a 1000M optical module to restore the interface rate to 1000 Mbit/s. On S5700 switches in V200R001 and later versions, the interface rate of a 100M/1000M optical interface restores the default rate 1000 Mbit/s after the optical module is removed.

Why can an optical interface display interface Up/Down logs after the optical module is removed from the interface
When an interface frequently alternates between Up and Down, a large number of interface Up/Down logs are saved in the buffer. After the optical module is removed from the interface, logs cached in the buffer can still be displayed. You can run the undo info-center enable command to disable the information center and then run the info-center enable command to enable the information center.

Why is a black screen displayed when I use the front camera after installing the TE Desktop on the Surface 3?
The cause is as follows: The TE Desktop does not support the front camera of a tablet. The TE Desktop is developed for computers and does not consider the front camera scenario. The Surface 3 runs the Windows operating system and only TE Desktop, instead of the TE Mobile, can be installed on the Surface 3.

Why is the stack license not displayed on the OMU portal after the VCN3000 two-node cluster is successfully installed?
The VCN3000 two-node cluster license contains the stack license by default. If the two-node cluster is successfully installed, the stack is created successfully. Therefore, the stack license is not displayed on the OMU portal.

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