Lencore Spectra i.Net: Installation and Operations Manual - Manual (Page 44)

section 6
6.2 | system connections
Connect the Data CAT5e RJ45 cable that is going to the first i.Net OP to
the connection marked “TO OP” on the MPI.
You must also connect a ground wire from the MPI to the first i.Net OP. Doing this
connects the MPI ground to the i.Net OP ground. (Negative terminal on i.Net OP). All
wiring from the MPI must go to the SAME OP and must remain consistent.
See the MPI label to verify which audio or paging input you may need and to connect
appropriate music source or phone page into the MPI.
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