There can be a primary and secondary external timing references, for example, BITs as composite clock inputs: CC-A and CC-B. Internal Stratum 3E holdover in a controlled environment can be used if both CC-A and CC-B signals degrade. And, internal Stratum 3 oscillator in free-run mode is supported.
In an RST, the ETI requires an external composite clock. The ETI must reside in the primary shelf of the terminal but can be located in any general purpose slot. Deploy the ETI card redundantly for hot standby capability. External interface inputs/outputs are available via backplane wire-wrap posts of the slot where the ETI card is located.
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