3Com 3C410012A - OfficeConnect Remote 531 Access Router Getting Started Manual page 4

There are no user-replaceable fuses or user-serviceable parts inside
the unit. If there is a physical problem with the unit that cannot be
solved with problem solving actions in this guide, contact the
supplier.
Disconnect the power adapter before moving the unit.
WARNING: Twisted Pair RJ45 data port. This is a shielded RJ45
data socket. It cannot be used as a telephone socket. Only connect
RJ45 data connectors to this socket.