System Connections - Lencore Spectra i.Net Installation And Operation Manual

section 6

6.2 | system connections

Connect the Data CAT5e RJ45 cable that is going to the first i.Net OP to
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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
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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
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appropriate music source or phone page into the MPI.
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