Using Ppp On Dial-Up And Leased Lines; Using Packet-Switched Network Services - 3Com NETBuilder SI Using Manual

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HAPTER SING THE
Table 4 Dial-Up and Leased Line Services
Telco Line
Fractional T1
Digital Data Service (DDS) PPP
* Some ISDN lines support up to 56 Kbps per B channel. For more information, contact your ISDN service provider.
Table 5 Packet-Switched Services
Packet-Switched
Services/Protocol
X.25
Frame Relay
SMDS
B /R Y
RIDGE OUTER IN OUR
Protocol
PPP
Telco Line
POTS
Leased line
Leased line

Using PPP on Dial-Up and Leased Lines

All dial-up and leased lines use PPP. If you want to use multiple lines or
channels to connect to the same destination, you can use Multilink PPP.
Multilink PPP is especially useful for ISDN, as described in the following
section.
ISDN ISDN consists of two bearer (B) channels and one delta (D)
channel. Each B channel can transmit up to 64 Kbps; the D channel
transmits signaling information about the call to computers at the
switching system at a rate of 16 Kbps.
With Multilink PPP, you can use both B channels together for a combined
data rate of 128 Kbps. With PPP, you can use each 64 Kbps B channel
separately.
Some ISDN lines support up to 56 Kbps per B channel. For more
information, contact your ISDN service provider.

Using Packet-Switched Network Services

You can use packet-switched services with your bridge/router instead of
dial-up or leased lines to take advantage of high performance for a
reasonable price. This section describes X.25 and Frame Relay.
X.25 An X.25 packet-switched network is defined by the International
Telecommunications Union (ITU) Recommendation X.25, a global
standard that began development in the 1970s. The recommendation
N
ETWORK
Serial Device (Required
on Flex-WAN Serial Ports) Data Transfer Rate
CSU/DSU
CSU/DSU
Serial Device (Required on
Flex-WAN Serial Ports)
Modem
CSU/DSU
CSU/DSU
Up to 24 channels (DS0s) at 64
Kbps each
Up to 64 Kbps
Data Transfer Rate
Up to 56 Kbps
Up to 2.048 Mbps
Up to 2.048 Mbps