| Don't be confused about the difference between | | | | C-bits (stuffing) 21 bits |
| DS3 and T3 circuits. These terms are really | | | | X-bits (message) 2 bits/ |
| synonymous. Instead you should focus on what they | | | | P-bits (parity) 2 bits/ |
| can do for you...and the best scenarios for | | | | Data bits between overhead bits 84A DS3 |
| application.Digital Signal (DS) is a system of classifying | | | | connection is comprised up of two monthly charges: |
| digital circuits according to the rate and format of the | | | | the local loop and the port charge. The local loop |
| signal (DS) and the equipment providing the signals | | | | charge is the cost of the circuit provided by the |
| (T). DS and T designations have come to be used | | | | Local Exchange Carrier (LEC) that allows DS3 access |
| synonymously so that DS1 implies T1, and DS3 implies | | | | into the carrier's network. The loop charge is based |
| T3.A DS3 line (also known as a T-3) is an ultra | | | | on the distance from the customer's location to the |
| high-speed connection capable of transmitting data at | | | | edge of the carrier's network; the farther the |
| rates up to 45 Mbps. A DS3 line is equal to | | | | customer is from the network, the more the loop will |
| approximately 672 regular voice-grade telephone lines, | | | | cost. Nearly every carrier prices loops differently so it |
| which is fast enough to transmit full-motion, real-time | | | | is in your best interest to price DS3 service with |
| video, and very large databases over a busy | | | | several providers to ensure that you get the best |
| network. A DS3 line is typically installed as a major | | | | deal.DS Internet Access is the ideal solution for |
| networking artery for large corporations and | | | | businesses that require high-bandwidth access at a |
| universities with high-volume network traffic. Other | | | | reduced price. Whether you host high-traffic Web |
| example applications include large call centers, | | | | sites, support Web hosting or need high-capacity |
| enterprise wide VoIP and IP PBX systems, Internet | | | | bandwidth on an as-needed basis, there's a level of |
| service providers, research labs, video conference | | | | DS3 service (Full or fractional) that will meet your |
| centers and software development companies. A | | | | needs. Fractional to full DS3 or T3 circuits run from |
| DS3 is the second fastest, non optical connection | | | | speeds of 3 Mbps up to 45 Mbps.For customers that |
| offered in North America. A DS3 line is comprised of | | | | require more bandwidth than a T1 line can provide |
| 28 T1 lines, each operating at total signaling rate of | | | | but do not yet require the capacity of a full DS3 line, |
| 1.544 Mbps.DS3 circuits provide businesses and | | | | a fractional DS3 connection is the ideal solution. A |
| Internet Service Providers (ISPs) with up to 45 Mb/s | | | | fractional DS3 is similar to a full DS(T)3, only with |
| of dedicated Internet connectivity. This is an ideal | | | | some of the channels turned off. This reduces the |
| solution for users who have outgrown their T1 | | | | total monthly cost and provides additional capacity |
| connections and are in search of unlimited, | | | | that can be turned up in a matter of days. |
| high-capacity access. A DS3 line actually consists of | | | | Unfortunately, the DS3 (T) loop is still required for |
| 672 individual channels, each of which supports 64 Kb | | | | this service.If a full DS3 line is more bandwidth that |
| s. DS3 lines are extremely high bandwidth connections | | | | you really need, it is also possible to get Fractional |
| into a carrier's backbone. They typically include SLAs | | | | DS3, which gives you a portion of full DS3 bandwidth |
| (Service Level Agreements) that guarantee uptime | | | | at a lower cost. Of course, DS3 is also available in |
| and performance.The DS3 signal itself is composed of | | | | multiples to increase bandwidth, similar to bonded T1 |
| 28 DS1 signals and is constructed using a two-step | | | | service.DS3 service can be deployed for a wide |
| multiplexing process. First, the 28 DS1 signals are | | | | verity of applications. The most common uses are |
| multiplexed into seven DS2 signals. Second, the seven | | | | DS3 point-to-point, DS3 internet, DS3 frame relay, |
| DS2 signals are multiplexed into one DS3 signal. Each | | | | DS3 voice and DS3 VPN. The pricing for these |
| multiplexing step uses bit stuffing to handle the | | | | connections varies widely depending on the carrier, |
| different input frequencies. Overhead bits provide | | | | location of service and the application for which the |
| alignment, error checking, in-band communications, | | | | connection is being used. Visit DS3 Bandwidth to |
| and bit stuffing control information.Line rate: | | | | obtain current "real time" rate quotes for your |
| 44,736,000 b/s | | | | location.Michael is the owner of FreedomFire |
| Signals: 7 DS2 signals = 28 DS1 signals | | | | Communications....including Michael also authors |
| Overhead bits: | | | | Broadband Nation where you're always welcome to |
| 56 bits total/frame | | | | drop in and catch up on the latest BroadBand news, |
| F-bits (framing) 28 bits/ | | | | tips, insights, and ramblings for the masses. |
| M-bits (multiframing) 3 bits/ | | | | |