Polycom MGC Administrator Administrator's Manual page 162

Chapter 3 - Defining Network Services
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This tab contains settings specific to the MPI Network Interface module.
Each of the spans listed here represents one serial port on the MPI Box.
3. To assign a circuit ID to the appropriate port:
a. In the Span n box (where n is the port number on the MPI Box to
which the serial cable connects), clear the Null Configuration
check box to enable this port.
b. In the Circuit ID box, enter the circuit ID as defined in the Network
Service–Span dialog box. According to the selected circuit ID, the
Network Service is assigned to the MPI network card. A different
circuit ID must be assigned to each port. The circuit IDs can be
taken from the same Network Service or from different Network
Services, if the port characteristics are different.
c. Click Apply.
The name of the Network Service appears in the Service Name box.
4. Click OK.