Cisco GLC-BX40-DA-I

The Cisco GLC-BX40-DA-I is a Small Form-Factor Pluggable (SFP) transceiver module manufactured by Cisco Systems. It is designed for use in Cisco networking equipment and provides a Gigabit Ethernet interface. The "GLC" in the model name stands for Gigabit Interface Converter (GBIC) and "BX40-DA-I" refers to the specific type and specifications of the transceiver. The "BX" indicates that it is a BiDi (Bidirectional) transceiver, meaning it uses a single fiber strand for both transmitting and receiving data. The "40" represents the wavelength, with a downstream wavelength of 1490 nm and an upstream wavelength of 1310 nm. The "DA" indicates that it uses Direct Attach copper cabling for connectivity, and the "I" signifies that it is an industrial-grade module. Overall, the Cisco GLC-BX40-DA-I is used to enable high-speed data transmission over fiber optic or copper connections in Cisco networking devices.