What is the difference DSL and ADSL? Which of these is more widely applied in Egyptian networks?

Answer 1

DSL (Digital Subscriber Line) - a technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines. Assuming your home or small business is close enough to a telephone company central office that offers DSL service, you may be able to receive data at rates up to 6.1 megabits (millions of bits) per second (of a theoretical 8.448 megabits per second), enabling continuous transmission of motion video, audio, and even 3-D effects. More typically, individual connections will provide from 1.544 Mbps to 512 Kbps downstream and about 128 Kbps upstream. A DSL line can carry both data and voice signals and the data part of the line is continuously connected. DSL competes with the cable modem and satellite transmission for high-bandwidth information reception.

ADSL (Asymmetric Digital Subscriber Line - the form of DSL most familiar to home and small business users. ADSL is called "asymmetric" because most of its two-way or duplex bandwidth is devoted to the downstream direction, sending data to the user. Only a small portion of bandwidth is available for upstream or user-interaction messages. However, most Internet and especially graphics- or multi-media intensive Web data need lots of downstream bandwidth, but user requests and responses are small and require little upstream bandwidth. DSLAM (Digital Subscriber Line Access Multiplexer) - a device that interconnects multiple DSL users to a high-speed backbone network. Typically, the DSLAM connects to an asynchronous transfer mode (ATM) network that can aggregate data transmission at gigabit data rates. At the other end of each transmission, a DSLAM demultiplexes the signals and forwards them to appropriate individual DSL connections.

i guess they would be use adsl. in that area.

Answer 2

DSL refers to Digital Subscriber Line. ADSL refers to a particular type. Assymetric DSL. Which means the upload and download speeds are different. SDSL means symmetric DSL in which the upload and download speeds are the same.

I have no knowledge of Egyptian internet products. Usually, the differences in offering are whether dsl is configured as PPPoE, Point to Point Protocol over Ethernet, or PPPoA which is Point to Point Protocol over ATM. The later is almost totally phased out in the U.S. Other variations are based on how you connect and whether or not you have a static (unchanging) or dynamic (changing) IP (internet protocol) address.

Most DSL providers require a user name and password to connect, however Embarq (formerly Sprint Local Telephone Division) stopped having users log on with a user name & password and set up the customer as DHCP, which just means they are automatically assigned an IP address.