9.2 Internet Access Technologies Flashcards
DSL and cable modem technologies are commonly called ____________ because they provide high-speed communications
broadband technologies
_____________________ is a family of point-to-point technologies designed to provide high-speed data transmission over traditional telephone lines
Digital Subscriber Line (DSL)
The actual cable in the ____________ from a home or office to the telephone company end office capable of providing much higher data transmission rates
local loop
The equipment that is installed at the customer location is called the ________________________
customer premises equipment (CPE)
The CPE may include a ____________ that is used to separate the traditional voice telephone transmission from the data transmissions
line splitter
The line splitter also directs the data transmission into a ____________, which is sometimes called a DSL router
DSL modem
A DSL modem or DSL router is both a modem and a ______________________ multiplexer
frequency division multiplexing (FDM)
The local loops from customers enter and are connected to the ________________________ (MDF)
main distribution facility
MDF splits the voice traffic from the data traffic and directs the voice traffic to the voice telephone network and the data traffic to the ________________________ (DSLAM)
DSL access multiplexer
The __________ demultiplexes the data streams and converts them into digital data
DSLAM
Uses FDM to create three separate channels over the one local loop circuit
Asymmetric DSL (ADSL)
One channel of the ADSL is the traditional ____________ circuit
telephone
A second channel is a relatively high-speed _________________ downstream from the carrier’s end office to the customer
data channel
The third channel is a slightly slower data channel ____________ from the customer to the carrier’s end office
upstream
ADSL is called asymmetric because its two data channels have different speeds — each of the two channels is further ____________ using TDM
multiplexed
The size of the two digital channels depends on the distance from the _________ to the end office
CPE
A digital service offered by cable television companies
Cable Modem
The ________________________ (DOCIS) standard is the dominant one
Data over Cable Service Interface Specification
DOCSIS is not a formal standard but is the one used by most vendors of ________________________ (HFC) networks (cable networks that use both fiber-optic and coaxial cable)
hybrid fiber COAX
DSL is a point-to-point technology; cable modems use ________________________
shared multipoint circuits
The cable TV wiring entering the customer premises is a standard ____________ cable
coaxial
The coax cable runs to a ____________, which has an optical-electrical (OE) converter to convert between the coaxial cable (customer side) and fiber-optic cable (cable TV company side)
fiber node
The fiber nodes are in turn connected to the cable company ____________________ (sometimes called a headend) through two separate circuits: an upstream and downstream circuit
distribution hub
The upstream circuit, containing data traffic from the customer is connected into a ________________________ (CMTS)
cable modem termination system
