External clock
When HEX-switch is on position 0, the clock extracted from the signal received at
the E1 BNC Rx port is used. This is the normal configuration when connected to a
telecom network.
Internal clock – “Master mode”
When HEX-switch is on position 1, the clock used is generated by an internal
2048kHz clock. This is used when two 21-219 are directly connected to each other
with coaxial cables. Only one 21-219 shall have this configuration.
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