Typically, the download speed of
consumer DSL services ranges from 256 to 24,000 kbps, depending on
DSL technology, line conditions, and the service level that has been
implemented. DSL implementations often use PPPoE or PPPoA. Both
implementations offer standard PPP features such as authentication,
encryption, and compression. PPPoE is a network protocol for
encapsulating PPP frames in Ethernet frames. PPPoA is a network
protocol for encapsulating PPP frames in ATM adaptation layer 5
(AAL5).
Establishing a Point-to-Point WAN Connection with PPP 317
??” Cable-Ethernet: A cable modem is a type of modem that provides
access to a data signal sent over the cable television infrastructure. Cable
modems are primarily used to deliver broadband Internet access, taking
advantage of unused bandwidth on a cable television network. The
bandwidth of business cable modem services typically ranges from
3 Mbps up to 30 Mbps or more. Current cable modem systems use the
Ethernet frame format for data transmission over upstream and
downstream data channels. Each of the downstream data channels and
the associated upstream data channels on a cable network form an
extended Ethernet WAN.
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