How About OC3? Now where does OC3 fit into all of this? OC3 runs at Mbps. So OC3 has nothing to do with T3, or does it? The Common Thread of Timing You see, the common theme that runs through all of these digital transmission schemes is the basic design of synchronous time division multiplexing based on the DS0 channel.
Because DS0 carries exactly 1 telephone call and that's the lowest common denominator for the telephone companies who designed the standards. Copper or Fiber The T1 or T3 service you order might be delivered on a dedicated copper wire circuit or it might be dropped off from a larger OC3 fiber optic cable. It depends on which hookup is most economical. Still Confused? Just remember T3 and DS3 refer to the same thing. OC3 is much faster, and more expensive. Ethernet is far more scalable than earlier technologies and enjoys a cost advantage as well.
Here's when that makes sense What's the difference between DS3 and T3? Ah, what's in a name? Both of these terms have their origination in the T-carrier system, originally developed to provide high speed "trunk" lines between telephone company offices. Everything is based on DS0 or "digital signal level zero" which is a 64K bit per second channel. Group 24 DS0 channels together and you have a DS1.
When the DS1 is connected to a wire circuit, it is called a T1. T1 runs at 1. Not fast enough? OK, group 28 DS1 channels together equivalent to 28 T1 lines and you have a DS3 or digital signal level 3 running at Connect that to a wire circuit and its called a T3. By the way, that T3 line is equivalent to voice channels.
Two T1 lines, for instance can deliver 3. In this system, twenty-four 24 DS0s are multiplexed into a DS1 signal. Twenty-eight 28 DS1s are multiplexed into a DS3. OC-3 runs at a speed of Mbps megabits per second where a T3 line runs at 45 Mbps which is a significant difference in the speed of data transfer.
Skip to content Helpful tips. April 3, Joe Ford.
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