Altigen AltiContact Manager Version 4.6 Administration Manual page 195

T1 Clocking
Depending on the configuration of the T1 boards and span for your
AltiContact Manager system(s), the System Clock Master setup should be
set according to the follow conditions:
• If all of the T1 boards are connected to an FXO (Foreign Exchange
Office) or CO, the System Clock Master check box must NOT be
checked for any of the T1 boards.
• If two AltiContact Manager systems are connected back-to-back with
a T1 span, the System Clock Master check box must be checked for
only one of the T1 boards.
• If two T1 boards in the same AltiContact Manager system are
connected back-to-back with a T1 span, the System Clock Master
check box must be checked for the T1 board that has not been
designated by the MVIP setting as the system's master clock to drive
the MVIP bus.
• If four T1 boards are in the same AltiContact Manager system, where
each pair is connected back-to-back with a T1 span:
— The System Clock Master check box must be checked for one of
the T1 boards from the first pair, that has not been designated by the
MVIP setting as the system's master clock to drive the MVIP bus.
— The other two T1 boards of the second pair must have its System
Clock Master check box unchecked
Important: In all back-to-back cases, the MVIP Clock Configuration
should be set to "Manual," and the board connected to the
board configured as the back-to-back clock master must be
designated at the MVIP bus master.
AltiContact Manager Administration Manual
Board Configuration
6-21