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What is a network? 107
Figure 56
Two Simultaneous Connections
The B channels may also be combined using the Multilink PPP feature to allow one
higher speed connection to a single location as shown in Figure 57.
Figure 57
Using Multilink to Combine B Channels for a Single High-Speed Link
How do different
devices communicate
with each other?
Once the computers are physically connected in a network, they must run some
type of standard communications software that allows different types of
computers to communicate with each other. Transmission Control
Protocol/Internet Protocol (TCP/IP) is becoming the most common software used
to accomplish this.
What is TCP/IP? TCP/IP is a standardized communications protocol that works across LANs and
WANs, allowing different devices to communicate with each other. As its name
indicates, TCP/IP has two main components, TCP and IP. TCP manages the transfer
of data and corrects any errors that occur during transmission. It ensures that data
is reliably transferred. IP routes the data in packets from one location to another
across a network using the source and destination information within each data
packet to determine routing and destinations.
Note that TCP/IP encompasses more than the two protocols which define its
name. It comprises a set of software applications that allow various network
services such as remote file transfer protocol (FTP), remote login (Telnet), and
e-mail Simple Mail Transfer Protocol (SMTP) and Post Office Protocol (POP) 3.
Public telephone
network
Remote office
LAN
ISDN BRI line
Internet/Intranet or
online service
PWR
ISDN
B1
B2
3 Com
Alert
Tx
Coll
1
2 3 4
LAN STATUS
B channel 1
B channel 2
B channel 1
B channel 2
OfficeConnect
¤
ISDN LAN Modem
OfficeConnect
®
ISDN LAN Modem
Public telephone
network
Remote office
LAN
Combining both
B channels with Multilink
provides a single 128 Kbps*
connection
Internet/Intranet or
online service
PWR
ISDN
B1
B2
3 Com
Alert
Tx
Coll
1
2 3 4
LAN STATUS
64 Kbps B1
64 Kbps B2
128 Kbps B1 & B2
*Without compression.
OfficeConnect
¤
ISDN LAN Modem
OfficeConnect
®
ISDN LAN Modem