Boulder Amplifiers 1012 DAC Preamplifier - Manual (Page 40)

“UNIT 1 IS OFFLINE” means that the slave is no longer responding
via Boulderlink. Its Boulderlink cable may have become disconnected, or
the mains power has been disconnected.
“UNIT 1 IS ONLINE” means that the slave is now responding
via Boulderlink in a normal manner and has been recognized by the
master.
BOULDER
LINK
5-5