Westell E90-311090 Network Interface Unit Module

The Westell E90-311090 DS1 Network Interface Unit Module is a DS1 NIU designed for DS1/T1 network interface applications in telecommunications and digital signal transmission systems. It is commonly installed in carrier communication systems, telecom infrastructure environments, and network transmission equipment, where it provides DS1 signal management and network interface operation. This module mounts as a 200 Mechanics Plug-In Module and includes a DB9 RS-232 Craft Interface for local connection, with remote and local loopback for diagnostic testing. It supports performance monitoring through integrated signal monitoring capabilities and includes a Test Pattern Generator for verification during maintenance. The Manufacturer Part Number is E90-311090, and the unit is intended for replacement and telecom system maintenance within telecom infrastructure and carrier networks, including telecom repeater systems. It is optimized for DS1/T1 network interfaces and is designed to meet the needs of carrier networks requiring reliable DS1 signal management and monitoring. Common replacements include Westell A90-311560 DS1 NIU-PM Module, Westell B90-311440 T1 NIU Performance Monitor, and Westell C90-311072 DS1 NIU Module.