The EM8000D01 extension module is specifically designed to enhance the performance of 80xx time reference systems and is housed in a dedicated DIN rail enclosure. This module features two unmodulated IRIG-B signal outputs via a fiber optic connector for multimode fiber optic cables with a wavelength of 820nm and an ST connector type. Additionally, it includes two IRIG-B DCLS signal outputs at 5V DC/TTL via pluggable screw terminals. The housing dimensions are 130x135x105mm (D x W x H), and it is only available with the purchase of a new time reference system, making it unsuitable for on-site expansion or replacement.