It is good to know when learning about a T3 connection that modulation helps bring the whole system together.  

Modulation is a key concept in telecommunications and is used to impose the information of one signal on another.

Modulation represents a digital message as an analogue waveform. This is keying which comes in several techniques.  These techniques include phase-shift keying, amplitude-shift keying and minimum-shift keying.

Bluetooth uses phase-shift keying for exchanges between devices.  However, modulation is also used to boost the frequency of analogue signals. Raw signals are not suitable for transmission over long distances of free space because of its low frequencies.

Therefore, this information must be superimposed on a higher frequency signal before transmission.

There are several different modulation schemes available to achieve this.  Some of the most basic schemes are amplitude modulation and frequency modulation. You should also know that a fractional T is a full DS3 capable circuit, however it is throttled back to deliver only a portion.

Once you have fractional service upgrading to full service is easy because of the facility of the install.   It involves the same amount of overhead, crews, time, and connections. Fractional service typically comes in 256Kbps increments from 256Kbps all the way to a full DS3 at 1.5Mbps.

Keep in mind that reliability is critical when customers or employees depend on your connection for immediate responses.

If your customers use your connection to access your databases or your server, reliability of your connection is critical. If your employees depend on your connections because you host the e-mail server in house or host web servers or ASP type products, your connections are critical. A critical connection is similar to a lifeline, without which your business would suffer consequences.  I

n addition, when you are searching for a T3 service, it is good to be familiar with the fact that the majority of DS3 line users opt for the full DS3. Also, price break point vs. speed averages around half a DS3.   It is interesting to consider the fact that in the 1990's, a fractional T3 cost might have been about 35% lower than the full 1.54 Mbps DS3. Now, there is not really any difference in price.

Full T3 cost has come down considerably in recent years. A fractional DS3 has a 50% bandwidth decrease but only a 5%  price decrease. Fractional DS-3 (T3) on the other hand is a very cost effective solution since pricing is based on a portion of a 45 Mbps circuit.