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