Hardware and Software Requirements The following hardware is required for HP SNMP/XL: * Any HP 3000 Series 9xx. * Any link product (NIO, CIO, PSI). * Any protocol (SDLC, LAP-B, X.25). The following software is required for HP SNMP/XL: * MPE/XL Release 3.1 or later. * One or more NS Links products.