Can a 100Mbps optical module be plugged into the combo interface
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. The 100FX transceivers enabled by Aruba Switches use an SGMII (Serial Gigabit MII) interface with 8B/10B encoding. It combines the Fast Ethernet physical layer specification with the compact Small Form-factor Pluggable (SFP) interface, allowing flexible deployment in. As it's a combo port make sure media type isn't set to sfp, and make sure port is not shutdown. But it will be able to take low voltage differential in the region of 200mVpp to 500 mVpp. The 100FX SFP module for fast Ethernet (FE) ports provides a 100-Mbps optical link using LC connectors and 1310-nm MMF (multimode fiber) cable.
Read More