DS-3
A DS-3 signal is a 45 megabit per second digital transmission, part of the PDH hierarchy.
24 Digitized voice channels at a line rate of 64kbit/s are multiplexed into a DS-1 signal, and then 28 DS-1s are multiplexed to make a DS-3. Since these circuits are digital, they can be easily used to carry data instead of voice calls, and it's this use that most readers are probably familiar with.
A DS-3 is carried on a pair of coaxial wires, presented as two BNC connectors, labeled "in" and "out", or "receive" and "transmit". DS-3 signals only carry for a few hundred feet before they need regeneration, so they're almost never used outside a building.
When a customer orders a DS-3 from a provider, they usually get a SONET optical circuit run into the building, with a cabinet containing a mux that delivers the DS-3 in its familiar electrical format to the customer.
Oops, I just found the page T-carrier and realized this page is redundant. The only page which points here, Synchronous_optical_networking has been changed to point to T-carrier. As soon as I figure out how to flag this page for deletion, I'll do that.
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