Siemens, Extender, models:

505-2571	User Manual
6ES7 972-4AA02-0XA0	User Manual
PAD-3	Installation, Operation And Maintenance Manual
PAD-4	Installation, Operation And Maintenance Manual
PSX-12	Installation Instructions Manual
PSX-12C	Installation Instructions Manual
SIMATIC NET PE400-8SFP	Operating Instructions Manual
SPCE110	Manual
SPCE120	Installation Instructions Manual
SPCW130	Installation Instructions Manual