Dial Up & Modems Flashcards
PSTN
Public Switch Telephone Number
Referes to global connection both analog and digital
POTS
Plain old telephone service
(Dial up connection uses this)
Modems
Transferring data across a dial up connection
Baud rate
A measurement of how many bits can be passed across a phone line in a second
Broadband
Any connectivity technology that isn’t dial up internet
T-carrier technology
Invented by AT&T. Transmits multiple phone calls over a single link. Require dedicated lines
Cable broadband
Uses same kind of cable that brings cable TV signals but is shared amongst several home or businesses in an area.
Fiber optical connections
Uses thin strands of glass or plastic to transmitted data as light making it incredibly fast.
DSL
Digital Subscriber Line
Twisted pair of copper used by telephone lines transmit faster data than voice to voice calls.
DSLAM
Digital subscriber line access multiplexers
Long running established data connections across the phone lines. Switches on and off
ADSL
Asymmetrical digital subscriber line
Different speeds for outbound and incoming data. Faster download slower upload. Home users
SDSL
Symmetrical digital subscriber line
Download and upload speeds are equal to each other
