Clocking In Serial Environment - Polycom MGC Administrator Administrator's Manual

Clocking in Serial Environment

When the MCU is connected directly to both ISDN lines and serial lines, the
MCU synchronizes its clock with the ISDN network clock.
In a serial only environment, the DCE, which is connected to a T1/E1 line,
synchronizes its clock with the ISDN network clock. This clock is transferred
via the serial connection to the MCU, but only when the serial connection is
active (i.e. when it transfers a call to/from the MCU). Therefore, when
starting a conference, the participant whose span is set as the primary clock
must be connected first and disconnected last when terminating the
conference as this participant provides the clocking signal for the system.
In a serial only environment, you must define one span as Primary clock and
another span as Backup clock.
1. Connect to the MCU.
2. In the Browser pane click the plus [+]icon next to the MCU icon, to list
its options.
3. Double-click the MCU Configuration icon, or click on the plus [+] icon
next to the MCU Configuration icon, to list the Configuration options.
4. Double-click the Cards icon or click the plus [+]icon next to the Cards
icon to list the MCU slots.
5. Double-click the slot containing the module you want to configure, or
click the plus [+] icon next to the card icon.
The MPI units are displayed in the Browser pane and in the Status pane.
6. Right-click the unit you want to configure, and then click the desired
option.
Select Set As Primary Clock Source or Set As Backup Clock Source
according to the desired configuration.
MGC Administrator's Guide
5-135