The yellow ACT LED displays the synchronization status of the MM710 media module.
If the ACT LED is solidly ON or OFF, the ACT LED is not been defined as a synchronization source. If the ACT LED is ON, at least one channel is active. If the facility is an ISDN facility, the D-Channel will count as an active channel and will cause the ACT LED to be ON.
When the MM710 is driving a clock sync source line to the main clock, the ACT indicates that the MM710 is the sync source by flashing a regular 3-second sequence:
If the MM710 has been specified as a sync source and is receiving a signal that meets the minimum requirements for the interface, the ACT LED will flash ON for 2.8 seconds and will be OFF for 300 ms.
If the MM710 has been specified as a sync source and is not receiving a signal, or is receiving a signal that does not meet minimum requirements for the interface, the ACT LED will be OFF for 2.8 seconds and will flash ON for 300 ms.
