Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
CO
|
(Central Office) – where the Local Loop terminates in the PSTN
|
|
|
CLEC
|
(Competitive Local Exchange Carrier) - a competitor to the ILEC
|
|
|
IXC
|
(Interexchange Carrier) - a telephone carrier that transmits voice traffic between LATAs
|
|
|
LATA
|
(Local Access and Transport Area) - one of the roughly 200 site regions the United States has been divided into for telephone service
|
|
|
LEC
|
(Local Exchange Carrier)- local phone company
|
|
|
POP
|
(Post of Presence)- used by IXC to route calls to other networks
|
|
|
PSTN
|
(Public Switched Telephone Network) – the worldwide telephone network
|
|
|
FDM
|
(Frequency Division Multiplexing) - multiple signals are sent over different frequencies within the same channel, with a guardband between frequencies, commonly used in DSL
|
|
|
ARQ
|
(Automatic Retransmission Request)- a form of error handling, 3 types: Discrete ARQ, Continuous ARQ, Selective ARQ,
|
|
|
YCC (YCbCr)
|
color encoding, divides image into luma and chroma components, Y is the intensity, and Cb and Cr are the color.
|
|
|
PCM
|
(Pulse Code Modulation) - codec used to convert analog audio to a digital signal, runs at 64 Kbps, and is the G.711 standard.
|
|
|
DSL
|
Dedicated Subscriber Line, uses FDM to share data and voice, mostly ADSL, Asymmetric with upstream bandwidth much smaller than downstream.
|
|
|
DSLAM
|
DSL Access Multiplexer splits voice from data traffic
|
|
|
DOCSIS
|
Data Over Cable Service Interface Specifications, latest version 3.0
|
|
|
MAC
|
Media Access Control, necessary for shared media to determine who uses it when
|
