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What is T1 or DS1 Service ?

Most of us are familiar with a normal business or residential line from the phone company. A normal phone line like this is delivered on a pair of copper wires that transmit your voice as an analog signal . When you use a normal modem on a line like this, it can transmit data at perhaps 30 kilobits per second (30,000 bits per second).
The phone company moves nearly all voice traffic as digital rather than analog signals. Your analog line gets converted to a digital signal by sampling it 8,000 times per second at 8-bit resolution (64,000 bits per second). Nearly all digital data now flows over fiber optic lines, and the phone company uses different designations to talk about the capacity of a fiber optic line.
If your office has a T1 line, it means that the phone company has brought a fiber optic line into your office (a T1 line might also come in on copper). A T1 line can carry 24 digitized voice channels, or it can carry data at a rate of 1.544 megabits per second. If the T1 line is being used for telephone conversations, it plugs into the office's phone system. If it is carrying data it plugs into the network's router.
A T1 line can carry about 192,000 bytes per second -- roughly 60 times more data than a normal residential modem. It is also extremely reliable -- much more reliable than an analog modem. Depending on what they are doing, a T1 line can generally handle quite a few people. For general browsing, hundreds of users are easily able to share a T1 line comfortably. If they are all downloading MP3 files or video files simultaneously it would be a problem, but that still isn't extremely common.
A T1 line might cost between $300 and $1,500 per month depending on who provides it and where it goes. The other end of the T1 line needs to be connected to an ISP  and the total cost is a combination of the fee the phone company charges and the fee the ISP charges
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What Kind of  Service Would Be Right for your Business?

  • DS-0 (Digital Signal Level 0)-Non-switched dedicated service designed for full transmission of voice, analog data and     digital signed transmitting at speeds of 56 KBPS. DS-0 is bi-directional, moving information in both directions. An example would be your home telephone line. DS-0 is the "building block" of all dedicated products.
  • DS1 / T1 (Digital Signal Level 1) -Simply 24 DS-0 circuits all bundled together on one T1 circuit. This dedicated connection provides user with a single high-capacity digital circuit for voice or data applications, with the choice of allocating all of the DS-0 channels for data, voice or a combination of the two.
  • T1 Internet Service high speed internet in which all 24 channels are allocated to data, a two-way connection to the Internet at 1.544 MBPS. (DSL usually runs between 128 KBPS and 728 KBPS) Typical cost range is between $300 and $1000 per month, depending on the distance from the long distance switch. Customers who use T1 data connections are typically businesses who need very high speed internet connections to transact business, communicate electronically with other offices, and who either donít qualify for DSL service or need more speed and increased reliability than DSL can offer
  • T1 Voice Service - For customer with 12-24 phone lines that rely heavily on DS-1 voice service. All 24 lines would be connected to the long distance carrier at the same time whether for outbound, inbound, or bi-directional. Two costs associated with this service: one is the Local Loop fee which is a flat fee charged by the local phone company each month. Second is the cost of the Long Distance Usage with rates of 10-40% LOWER than switched long distance service
  • T1 PRI Voice Service - Same service as DS-1 (T1) with the exception that only 23 channels are dedicated to voice or data. The last channel (line) is used to handle routing,  or network application. T1 PRI is used mainly by Call Centers.
  • Integrated T1 Voice and Internet Service- Integrated T1 service is both voice and data traffic on the same T1. 24 Channels (lines) are allocated between data and voice as to the needs of the business.
  • Point to Point T1 Service- For businesses that require constant connectivity to another office location. Same as a T1 service, except you have two Local Loop charges - one at each end, but calls/transfers between two points is unlimited, with full duplex speed of T1(1.5 MBPS)
  • Frame Relay Service- For businesses with 2 or more locations that require constant connectivity. The user can select speeds between each satellite location and the host which can reduce costs and allow for future upgrades in speed.

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