When a DS3 is delivered over fiber it is still an analog type trunk connection at the termination points.

Triple play solutions over optical fiber are increasing in availability and popularity.

DC continuity is not available over a microwave radio, optical fiber, or a multiplexed telephone circuit connection.

On the one hand, this seems unlikely, as transporting 100Gbps over fiber is already a big challenge.

The afternoon died away; the circular spots of sunlight moved steadily over green fronds and brown fiber but no sound came from behind the rock.

My question is how does this differ from Ethernet over fiber?

The ASK technique is also commonly used to transmit digital data over optical fiber.

Such transmission is also possible over relatively inexpensive fiber optic telephone lines.

The data packets are sent almost instantaneously over fiber optic telecommunications lines and complex switches nationwide.

However, 1Gbit/s ethernet over fiber can easily reach tens of miles.