Does the combo port on an S series switch support 100M optical modules

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For S series switches, optical ports of combo ports support 100M optical modules.

Other related questions:
Does the Combo interface of an SRU support 100M optical modules
Yes. However, a Combo interface does not support auto-negotiation mode when a 100M optical module is inserted to it. Therefore, the peer device must be a 100M optical module that is manually configured to 100M full-duplex mode.

Can the combo interface on the SRU connect to the 100M optical module
Yes, the combo interface on the SRU can connect to the 100M optical module. When the combo interface on the SRU connects to the 100M optical module, it does not support auto-negotiation mode, so the peer device must use the 100M optical module and the peer interface must be manually configured to work in full duplex mode.

Combo port supported by S series switches
Combo ports are supported by S series switches as follows: Modular switch: - S9300: LE0MG24CA, LE0DG24CEAS0, LE1D2S04SX1E, and LE1D2S08SX1E - S7700: ES0D0G24CA00, ES1D2S04SX1E, and ES1D2S08SX1E - S9700: EH1D2S24CSA0, EH1D2S24CEA0, EH1D2S04SX1E, and EH1D2S08SX1E - S12700: ET1D2S04SX1E and ET1D2S08SX1E Fixed switch: - Switch models containing "TP" support combo ports.

Does the S5700 interface support 100M optical modules
Fixed optical interfaces on the S5700-EI, S5700-SI, S5710-LI, and S5700-HI support 100M optical modules, while interfaces on extended front cards do not support 100M optical modules. Combo optical interfaces and 100/1000Base-X optical interfaces on the S5700-LI and S5700S-LI series switches support 100M optical modules. The S5710-EI series switches support 100M optical modules only on their combo optical interfaces. Combo optical interfaces and 100/1000Base-X optical interfaces on the S5720-EI series switches support 100M optical modules. In the S5720-HI series, only the S5720-32C-HI-24S-AC supports 100M optical modules on their 100/1000Base-X optical interfaces. The S5720-SI series switches support 100M optical modules only on their combo optical interfaces.

Does the GE optical LPU of the S12700 support 100M optical module
The S12700's GE optical LPU supports both 100M optical modules and 1000M optical modules. When a 100M optical module is used, you must run the speed 100 command on the interface to set the interface rate to 100 Mbit/s. When using a GE optical module, an interface works at 1000 Mbit/s by default. If auto-negotiation is enabled on the interface, the interface speed cannot be set to 100 Mbit/s. If auto-negotiation is disabled, you can run the speed 100 command to set the interface speed to 100 Mbit/s. When two optical interfaces are interconnected, they must use the same type of optical module.

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