Polycom MGC Administrator Administrator's Manual page 157

The New MPI Span dialog box appears.
11. Define the following parameters:
Table 3-32: New MPI Span Dialog Box Options
Field
Circuit ID
Description
The Circuit Identification is a logical number used to
identify the span to the MGC Manager. This number
is later used to assign the span to the network
interface card. Type an integer from 0 to 65535, to be
used as the circuit identification number in the MGC
Manager. If you enter any other number, the system
will reject it and you will be prompted to re-assign the
circuit identification number.
Note: If other services are already defined, make
sure to use numbers other than those already
assigned to the existing services.
MGC Administrator's Guide
3-107