Panasonic KX-NS5174X is a 16-port single-line extension card, often referred to as a MCSLC16 card. It is designed to expand the capacity of specific Panasonic IP-PBX systems. The card allows you to connect up to 16 additional analog devices, such as standard single-line phones, fax machines, and modems.

Key Features and Compatibility

16 Analog Ports: The primary function of the KX-NS5174X is to provide 16 additional ports for analog single-line telephones (SLT). This is crucial for businesses that need to add more extensions for employees or other equipment without replacing their existing phone system.
Caller ID and Message Waiting: The card supports Caller ID on all its ports using the FSK (Frequency-Shift Keying) standard. It also includes a message waiting indicator feature, which lights up a lamp on compatible phones to signal a waiting message.
System Compatibility: The KX-NS5174X is designed to work with Panasonic’s KX-NS series of IP-PBX systems, including the popular KX-NS500, KX-NS700, and their expansion shelves like the KX-NS520 and KX-NS720. It is not a standalone device and must be used with a compatible PBX system. A single KX-NS700 system can support a maximum of two of these cards.
Installation: The card takes up a single “large” slot in the PBX chassis. Installation is a straightforward process of plugging the card into an available expansion slot. It’s generally recommended that a qualified technician handles the installation and subsequent programming to ensure proper system functionality.