DSL Arizona, - DSL Service offers residential customers high speed internet access for a very reasonable rate. Many people don't realize that DSL speeds of 1.5Mbps are the same as T1 speeds which top out at 1.5Mbps. What's the difference? To start with…the price. DSL costs $35 per month on average where a full T1 usually costs $400 or $500 if you're in a metro location and up to $1,000 per month if you're in a rural location. Why the high cost for T1 service without the extra speed? A T1 gives reliable service and is not shared with other subscribers or oversubscribed the way DSL is. Because it is not a shared service it carries a high cost.

DSL service offers a slightly less reliable service for a fraction of the cost. If you already have DSL Service you may have noticed that it's fast at some times and slower at other times. This is because it's oversubscribed. Oversubscription means that many people are pulling from the same resource. During the afternoon when people are at work there may be plenty of bandwidth to have, but in the evening when everyone is looking up the news, going through e-mail, or shopping online, access tends to be strained. Many people pulling from the same limited resource will find that there's only so much to go around. What does this mean to you? Slow speeds occasionally in peak traffic hours.

Most residential users' biggest concern is price and that's why DSL Service is so popular among them. A few slow periods are a small price to pay for a 90% discount if you're using the service at home.

Definition 1. - Technology that dramatically increases the digital capacity of ordinary telephone lines. The distance from the customer to the telco central office determines DSL speeds. Asymmetric DSL (ADSL) is for Internet access, where fast downstream is required, but slow upstream is acceptable. Symmetric DSL (SDSL) is best for connections that need high speed in both directions. DSL provides "always-on" operation. At the Central Office, DSL traffic is aggregated in a unit called the DSL Access Multiplexor (DSLAM) and forwarded to the appropriate ISP or data network. DSL can compete with cable modems in bringing multimedia and 3-D to homes and small businesses.

Definition 2. - A method for moving data over regular phone lines. A DSL circuit is much faster than a regular phone connection, and the wires coming into the subscriber’s premises are the same (copper) wires used for regular phone service. A commonly discussed configuration of DSL allows downloads at speeds of up to 1.5 megabits per second. This arrangement is called an ADSL: Asymmetric Digital Subscriber Line.

Definition 3. - Short for Digital Subscriber Line, DSL technologies use sophisticated modulation schemes to send data over the copper wire used for your phone connection and is considered high speed or broadband Internet access.

Definition 4. - This is technology that uses ordinary copper telephone lines to provide Internet speeds ranging from 1.5 to 9 Mbps--speeds that are 30 to 50 times faster than a regular 56-kbps dial-up modem. DSL also allows users to receive voice and data simultaneously, since the signal is carried on a higher frequency than normal telephone communications. xDSL refers to all types of Digital Subscriber Lines, including: ADSL: Asymmetric Digital Subscriber Lines SDSL: single-line digital subscriber lines HDSL: high-data-rate digital subscriber lines VDSL: very-high-data-rate digital subscriber lines.