
Implementation Notes for All Dial Services
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5-7
• Line availability -- Analog lines are available in most locations, enabling you
to dial in from any remote location.
• Throughput -- With the V.34 standard, throughput for asynchronous modems
is 28.8 Kb/s. Using the V.42bis compression standard, throughput can be
higher.
Figure 5-4
shows a network that uses asynchronous PPP over modem lines.
Figure 5-4. Using Asynchronous PPP over Modem Lines
Using low-cost asynchronous modems makes asynchronous PPP ideal for
customers with small networks who are trying to lower expenses.
All dial services can use asynchronous PPP for connections between two routers.
Only demand and backup service can use asynchronous PPP for connections
between a router and a terminal server.
All protocols that can operate with PPP, CHAP, and PAP can operate with
asynchronous PPP. Asynchronous connections also support software and
hardware data compression.
To configure asynchronous PPP, see “Modifying the WAN Interface Type” on
page 10-2.
MODEM
DS0028A
MODEM
MODEM
PSTN
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