2.7 Dial Up and DSL Flashcards
What does POTS stand for in networking?
Plain Old Telephone Service
What network does dial-up internet use?
The Public Switched Telephone Network (PSTN)
What is the maximum speed of a dial-up connection?
53.3 Kbps
Why is dial-up considered obsolete?
It is extremely slow compared to modern broadband connections
What does ISDN stand for?
Integrated Services Digital Network
How does ISDN improve over dial-up?
It combines multiple 64 Kbps channels for faster speeds
What is the main use of ISDN today?
Legacy business telephony and old video conferencing setups
What does DSL stand for?
Digital Subscriber Line
What infrastructure does DSL use to provide internet?
Existing telephone lines
What are the three main types of DSL?
ADSL, SDSL, and VDSL
What does ADSL stand for?
Asymmetric Digital Subscriber Line
What is a key characteristic of ADSL?
Faster download speeds than upload speeds
What is a typical speed range for ADSL?
Around 8 Mbps down / 1.5 Mbps up
What does SDSL stand for?
Symmetric Digital Subscriber Line
What is a key characteristic of SDSL?
Equal download and upload speeds
What does VDSL stand for?
Very High Bitrate Digital Subscriber Line
How fast is VDSL?
Over 50 Mbps down / 10 Mbps up
What is the main limitation of VDSL?
It only works within 4,000 feet of the DSL provider
What is a DSLAM?
DSL Access Multiplexer – a device that connects DSL users to an ISP
Why is DSL becoming less common?
It is being replaced by cable and fiber internet
What are the speed advantages of fiber and cable over DSL?
Fiber and cable offer much higher speeds, often exceeding 1 Gbps
Which DSL type is best for business applications?
SDSL, due to its symmetric upload and download speeds
What are some reasons dial-up is still used today?
Emergency backup, legacy systems, and areas with no broadband access
