Polycom MGC Administrator Administrator's Manual page 88

Chapter 3 - Defining Network Services
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6. To assign a Circuit ID to the appropriate span:
a. In the Span n box (where n is the span number on the Net-2/Net-4/
Net-8 module to which the PRI line is connected), clear the Null
Configuration check box to enable the span.
b. In the Circuit ID box, enter the circuit ID as defined in the Network
Service-Span and Phones dialog box. According to the selected
Circuit ID, the Network Service is assigned to the network card.
Each span can be assigned a different Network Service.
c. Click Apply.
The name of the network service appears in the Service Name box.
7. Click OK.
To configure a Net-2/Net-4/Net-8 span as primary or backup clock:
1. In the Browser pane, click the slot containing the Net-2/Net-4/Net-8
ISDN Network Interface module (PRI) to configure in the Status pane, or
click the plus [+] icon next to the Card icon to expand its units tree.
If you clicked the slot, the module's units and configuration are
displayed in the Status pane.If you expanded the units tree, the units are
displayed in the Browser pane. Each unit represents a span in the
Network Interface Module.