How many ds1 in a oc3

T1 or DS-1 - This is the equivalent of 24 phone lines. A T1 handle 1. The key word is BITS not bytes. Bits are much smaller than bytes - and they have a vary compare to a byte. A bit is One - A byte can be 4,8,10,12,16 depending on the thing we are talking about - The telecommunications industry uses bits - so we do to.. Please never confuse the two. From a PC standpoint 8 bits equal one byte. T2 or DS-2 - This is the equivalent of 4 T1's. The capacity is 6. T3 or DS-3 - This is the equivalent of 28 T1's.

The capacity is 45 million bits per second [45Mbps]. 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.

An OC12 is a type of high-speed dedicated circuit. The OC12 transmits data at a speed of Mbps. The term OC stands for Optical Carrier. 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? If you are involved with business telecommunications networking or need to be, you have probably heard the terms DS1 and DS3 bandied about.

But what do these terms really mean and where did they come from? It is a designation that is used to specify the capacity of a digital line in the T-carrier system. You know the most popular T-carrier service as T1. Another popular service is T3. Digital transmission carries many conversations on few wires and eliminates the noise and cross-talk that were commonly heard on long distance calls at that time. That was made the most basic element of the T-carrier system and given the designation DS0 or Digital Signal level zero.