The N2266A Matrix Module was built for the 3499A/B/C mainframes and have all been discontinued.
See these Keysight alternatives for this product:
34980A Multifunction Switch/Measure Unit.
DAQ970 Data Acquisition Unit
DAQ973 Data Acquisition Unit
The Keysight N2262A 4x8 Matrix Module contains 32 cross points organized in a 4-row by 8-column configuration. It provides the most convenient way to connect a group of test instruments to multiple test points on DUTs. Each cross point in the module switches two wires for the high and low of a measurement. Multiple matrix modules can be connected for applications that require large matrices. N2262As can be used in conjunction with other modules (such as multiplexer modules) to provide a wide variety of switching combinations. More than one switch can be in the closed state, allowing any combination of rows to be connected to columns. Up to eight channels can be operated in parallel for high speed switching. A connection terminal is not provided with the module. A screw terminal block, crimp and terminal block, and DIN96-to-D50/25 cables are available for ease of wiring.