IMG 1004 - Timing
By default Primary Loop and Secondary Loop Timing (Not external reference clock) can be configured only on Bearer Span Ports 0 and 1. For Timing pinouts see IMG 1004 - RJ48 Connector Pinouts
The IMG 1004 cannot time off an atomic clock or similar. The TDM inputs on the rear of the unit will only accept a loop timing clock source from T1 or E1.