Instead of a pluggable module, the optical engine is soldered directly onto the switch's main board—”on-board. ” The electrical interface to the switch's ASIC is much shorter, and the optical fiber is connected directly to a port on the line card. Optical modules typically have an electrical interface on the side that connects to the inside of the system and an optical interface on the side that connects to the outside. An eSFP optical module is an SFP optical module that supports monitoring of voltage, temperature, bias current, transmit optical power, and receive optical power. Currently, SFP modules also have the preceding functions. Small Form-factor Pluggable (SFP) is a compact, hot-pluggable network interface module format used for both telecommunication and data communications applications.
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