The Nortel NTK535LA GE EPL 4 Ports SFP is an optical module designed for the Nortel/Ciena OME6500 platform. It provides Gigabit Ethernet connectivity with Enhanced Private Line EPL functionality. The module has four ports, allowing for simultaneous connections to multiple devices or network segments. It supports Small Form-Factor Pluggable SFP technology, which enables hot-swappable and flexible deployment. The Nortel/Ciena NTK535LA module is commonly used in telecommunications networks to provide high-speed data transmission over fiber optic links.