There are 28 T1 carrier lines in a T3 connection.
Irlpa t1s.
You probably have requested either private networking between several business locations, or a fast connection to the internet where DSL is unavailable. This is usually accomplished by leasing local telco "T1 private lines" between you and your provider. These private lines are T1/DS1 (or E1 in Europe), which are 1.5 megabits/sec each. If you wish to get some multiple of that for net bandwidth (3M, 6M, etc), your provider will lease 2 to 8 T1s from the local telco, and bond them together using multiplexing. Your provider will provide an Anda 2108 box (see andanetworks.com) to aggregate those 8 T1s to give you a net bandwidth of 12 megabits to your facility. The next step up in telco circuits is a T3, a 45 megabit circuit. The monthly recurring cost from your local telco provider for a T3 is usually more than 10 times that of a T1, so ordering up to 8 T1s is still more cost effective. T3's are not available from all telco CO's like T1's are. Reliability of multiple bonded T1s is better, since you can lose one or more members and still have service, albeit degraded. T1's usually have a 4-hour repair commitment, where DSL is more than a business day.
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Ten T1s
A T1 is copper, and OC3 is fiber optic, so there is no way to make a T1 into OC3. Speed on a T1 is 1.544 Mbps, and speed on the OC3 is 155.52 Mbps, so in rounding, you need 100 T1 lines to equal the speed of an OC3.
DS3 is 44.7 Mbps and a T1 is 1.55 Mbps. So 1 DS3 = 28 T1s http://www.dslbroker.com/ds3.html
A channelized DS3 is also a DS3 Hub. Details can be found here. http://techblog.intelletrace.com/what-is-a-ds3-hub/ Summary: A Channelized DS3 supports up to 28 DS1's using M13. Originally, DS3's were used for aggregating T1s. Imagine 28 T1s, all terminating at a CO, but originating at 28 different locations at varying distances from the CO. Because the T1s are not related, they may be out of sync with each other. The original designers knew that this was a probability, so they designed the first stage of the multiplexing process to deal with the problem. The speed of a T1 is generally reported as 1.544 Mbps. If you multiply 1.544 Mbps * 4, you get 6.176 Mbps. Why, then, is a DS2, which is four T1s, shown as 6.312 Mbps? To compensate for T1s that are not delivering bits in a timely manner (+/- 77 Hz), the M12 multiplexer stuffs bits into the signal to get them up to speed with the other T1s in the group.
28 DS1's www.intelletrace.com
triiodothyronine (T3)
Both T1 and T3 are standard digital telephone carriers. They are designed to multiplex voice channels. T1 has a data rate of 1.544 Mbps and T3 has a data rate of 44.736 Mbps. So the answer is t3.
Bmi- T3 British Airways- T3 Flybe- T3 Lufthansa- T1 * All these airlines go to Dusseldorf.