The Transition Networks Stand - alone T1/E1/J1 Network Interface Device offers a robust solution for extending T1/E1/J1 connections alongside a 10/100 Ethernet connection over fiber. It includes four RJ - 48 copper interfaces, one 10/100Mbps Ethernet port, and one fiber interface, making it ideal for various networking needs. The device supports multi - mode fiber with a wavelength of 0.1 mil and is capable of operating over distances of up to 2 km. With features such as auto - MDI/MDIX, flow control, and loopback testing, it ensures reliable performance and easy troubleshooting. The compact design allows for wall mounting or standalone use, making it a versatile addition to any network setup.