Dialogic IMG 1004 - Manual (Page 114)

Installation and Setup
106
Timing - IMG 1004
Topic Location: IMG 1004-Installation and Setup Guide > IMG 1004-Hardware
Installation
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
NOTE: 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.