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DS3 Digital Signal 3 or T3 for Business




updated 09/14/18

Digital Signal level 3 (DS 3) also called T3 line are an extremely high bandwidth circuit that can provide up to 45 Mbps to the Internet. T3 broadband is known as DS3 broadband and vice versa. Internet connections of this high-speed nature allow users to experience the full-motion transfer of real-time video and enormously quickened data exchange over large, busy networks. To realize the exact speed of 45 Mbps via an Internet connection, you could compare the rate of one of these lines to that of nearly 700 regular telephone lines.

A DS3 internet line is 672 individual channels, and each of those channels supports a speed of 64Kbps. DS3 Internet connection offers more than enough bandwidth for your systems to handle any amount of voice and data flow; ideal for companies which require more than 5 MBPS and less than the full 45 Mbps. If you need less than 5 Mbps, like most small companies, you should request for a T1 line. DS3 is a standard for North America and Japan. Other parts of the world use a similar measure called E3. In the UK, the nearest equivalent is an E3, which transmits at 34.368Mbit/s.

These T3 lines or DS3 lines are generally costly and mostly used by big companies where high-speed internet connection is needed. T3 lines are primarily used by Internet Service Providers (ISPs) connecting to the Internet backbone and for the backbone itself. Other examples of companies who require the T3 connections are big universities, hospital and huge companies that need a high-speed internet connection. T3 would be best suited for these companies because it is capable of managing extremely high bandwidth requirements. A traffic equivalent to 672 analog telephone lines handled by Internet T3 alone


T1 and T3 are two common types of leased lines used in telecommunications. Both T1 lines and T3 lines are reserved circuits that operate over either copper or fiber optic cables.

T1 service is a digital broadband technology that enables one circuit to carry 24 voice, video, or data channels. The entire circuit runs at 1.54Mbps.
A T3 line or DS3 internet line is the equivalent to 28 T1 Lines. T3 is also able to carry a variety of traffic types but operates at much faster speed 44Mbps.
The introduction of T1 had many times the capacity of the fastest modems available and was more efficient than managing the individual analog copper lines that it replaced.

A brief history:

The T1 standard for data communication was developed by AT&T in the 1960s. T1 leased lines offer the same data rate as symmetric DSL (1.544 Mbps). T1 service was first used in the United States to connect telephone company backbone switches to one another over copper cabling. It was made available commercially to large financial services companies in downtown areas in 1983. An impetus for its wider availability was competition in the late 1980s from new providers who offered it at lower prices and in more locations than the incumbent telephone companies. Manufacturing efficiency, sharp increases in bandwidth demand and broader availability have led to more affordable T1 service. With some exceptions, T1 and T3 services are worldwide. T3, another function based on TDM, operates at 44Mbps in North America.

How DS3 or T3 works.

The connection would look something like this:

DS3 (T3)—>Backbone—>ISP—>CSU—>Router—>Server—>Customer

The DS3 internet line is like a large water main that serves a city, a large amount of water or traffic flows through it. Unlike the water hose in your front yard (your modem) the DS3 is the major carrier of the Internet traffic. The DS3 connects the backbone provider to the ISP provider via the Telco (telecommunications provider). The signal comes into the CSU and then goes to the router.

Once it arrives at the router it is transmitted to the main server which depending upon the design may be re-routed to other servers where the customer connects to access the Internet? The customer logs in on the local server which provides you with permission to access the Internet.
To provide you with an idea of a T3 internet connection, most small Internet Service Providers utilize a T1 which is capable of accommodating several hundred users. A T3 connection is capable of providing many more users and acts as a major carrier of the Internet. Depending upon configuration it can potentially handle thousands of users at any given time.

A Channel Service Unit is a necessary component to establish a connection between the telecommunications provider and the consumer’s equipment. It resembles a modem, but it is not a modem. However, it creates compatibility to make an Internet connection with the consumer possible. The link established through encoding and then the Channel Service Unit acts as an interface between the DS3 line and the customer’s router.
Comparison between a T1 and T3 line

T1 technology is used only in North America and Japan. The rest of the world uses E1, which operates at 2.048Mbps on 32 channels. T1/E1 and T3/E3 depend on strict adherence to timing. Each channel now referred to as a digital signal zero (DS-0). A DS-0 runs at 56Kbps or 64Kbps on T1 and E1 circuits. The DS-0 speed of 64Kbps is the same worldwide.

Organizations that link a T1 or E1 in the United States to an office in Europe need rate adaptation equipment so that the carrier in the United States can connect the domestic T1 to the European E1 line. Rate adaption equipment converts E1 signals to those compatible with T1 and vice versa; carriers supply rate adaptation equipment in their networks.

Who should use a T3?

A T1 system traditionally can handle both voice and data applications adequately; as many as 200 employees can be on the system at once, sharing first voice and data transfers, without problems. However, by bundling together 28 T1 lines, a T3 connection can run 30 times faster. So, when should you look at a business T3?
1. If you already have one or more T1 lines and still experience slow transfer speeds, a T3 line will speed things up considerably.
2. If your company is spread out over multiple locations (offices, manufacturing plants, distribution centers or call centers), a business DS3 connection will more easily absorb the voice and data traffic among the various locations.
3. If your company uses a lot of digital streaming, such as large amounts of data recording or archiving, video conferencing, VoIP, or surveillance cameras, a business T3 line will enable faster "real-time" capability with even less chance of drop-offs or black-outs.
4. If your company is large enough to have considered point-to-point microwave transmission, T3 pricing may be a more cost-effective alternative.

A Comparison of T3, J3, and E3 Worldwide Standards

DS-3 speeds differ internationally.
• The T3 North American speed is 44Mbps over 672 channels (28 X 24 = 672)—the equivalent of 28 T1s.
• The Japanese “flavor,” J3, operates at 32Mbps over 480 channels; this is the equivalent of 20 T1s.
• The E3 speed is 34Mbps over 480 channels. E3 is the equivalent of 16 E1s.

T3 services provided at fractional speeds; for example, fractional T3 offered at speeds of 10Mbps. However, customers who want fractional T3 often opt for the lower-speed Carrier Gigabit Ethernet, where it’s available; this provides a more scalable solution and is not limited to 44Mbps.
A Comparison of T1 and T3 Media Requirements

T1 is media agnostic; this means that it can operate over any medium, including fiber, copper, and microwave. However, because of its higher speeds, T3 requires fiber, terrestrial microwave, or satellite-based microwave. The term “terrestrial” denotes that the microwave service is transmitted from land-based towers, not satellites. Telephone companies use T1 and T3 over microwave for hard-to-cable areas such as across rivers and canyons, and cellular providers use a microwave as one choice to link together their antennas and data centers with centralized switches.

In many countries, fiber is commonly in place directly to midsize and large business premises in metropolitan areas. When fiber brought into a user’s premises, the end user must supply the electricity for the equipment on which the fiber terminates. If there is no backup power, customers lose their T1/E1s and E3/T3s when they lose power.
What are the advantages of a T3?

Efficiency – A T3 gives you a clear and clean connection. As you sometimes experience with using copper trunks, glitches do not occur in T3 connections. It is engineered especially for your site and tested at installation. The T3 connection can provide you with over 670 connections.

Speed – No other connection can rival the bandwidth and speed of the T3. By using the T3, you can perform multiple large functions at the same time as well as support many tasks that take more bandwidth such as graphics and real-time video. The T3 can also easily handle future applications.
Reliability – The T3 rarely encounters problems. This characteristic makes the T3 one of the most reliable types of connections you can find. If problems do occur, they are quickly corrected using remote diagnostics. With its many lines, the T3 is designed for some backup to avoid affecting connections when a problem arises.
Capping – A T3 or DS3 internet line can be capped off so that you only receive a fraction of the bandwidth, so it is customizable to fit your needs

And Disadvantages.

There are hardly any drawbacks to using a DS3 internet line since it is a significantly speedier connection as far as speed reliability than a Digital Subscriber Line, cable, or satellite connection. The primary drawback is the cost. However, there are ways to work through the price as we previously discussed


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