Using Ppp On Dial-Up And Leased Lines; Using Packet-Switched Network Services; Ibm Legacy Networks - 3Com 3C8S5007 - SuperStack II PathBuilder S500 Switch User Manual

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HAPTER VERVIEW OF THE
Table 4 Packet-Switched Services
Packet-Switched
Services/Protocol
X.25
Frame Relay
SMDS

IBM Legacy Networks

P B S
ATH UILDER WITCH
Telco Line
POTS
Leased line
Leased line

Using PPP on Dial-Up and Leased Lines

All dial-up and many leased lines use PPP. If you want to use multiple PPP
lines or channels to connect to the same destination, you can bundle
them together using Multilink PPP.

Using Packet-Switched Network Services

You can use packet-switched services with your PathBuilder S5xx series
switch instead of dial-up or leased lines to leverage the Telco-owned
switching infrastructure.
Frame Relay provides a packet-switched network that transfers data
between DTEs, which can be routers, bridges, and host computers, by
creating virtual circuits and using DCEs to transfer the data to its
destination.
Frame Relay has been designed to work within complex internetworking
environments with extensions referred to as the local management
interface (LMI).
LMI provides information about all devices that are accessible on the
Frame Relay network by listing all data link connection identifiers (DLCIs)
connecting the local system with the remote ones. The LMI improves
reliability between the DTE and DCE through frequent exchange of
keepalive packets that contain status information.
Each serial interface can be attached directly with a Flex-WAN cable to
IBM legacy equipment like mainframes and automatic teller machines.
See Table 5 for supported IBM protocols.
Serial Device
Requirements
Modem
CSU/DSU (not needed on
Ultra-WAN and BNC
connectors)
CSU/DSU
Data Transfer Rate
Up to 115 Kbps
Up to T3/E3
Up to T3/E3