What is a network? 107

OfficeConnect¤

ISDN LAN Modem

 

 

LAN STATUS

 

OfficeConnect®

 

3 Com

 

 

 

Tx Coll 1 2 3 4

 

 

 

 

Alert PWR ISDN B1 B2

ISDN LAN Modem

 

 

 

 

 

Internet/Intranet or

online service

B channel 1

Remote office

LAN

B channel 2

B channel 1

B channel 2 Public telephone network

ISDN BRI line

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.

OfficeConnect¤

ISDN LAN Modem

 

 

LAN STATUS

 

OfficeConnect®

 

3 Com

 

 

Alert PWR ISDN B1 B2

Tx

Coll

1 2 3 4

 

 

 

 

 

 

 

 

 

ISDN LAN Modem

 

 

 

 

Internet/Intranet or

online service

128 Kbps B1 & B2

Remote office

LAN

64 Kbps B1

64 Kbps B2 Public telephone network

Combining both

B channels with Multilink provides a single 128 Kbps* connection

*Without compression.

Figure 57 Using Multilink to Combine B Channels for a Single High-Speed Link

How do different Once the computers are physically connected in a network, they must run some devices communicate type of standard communications software that allows different types of

with each other? 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.

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3Com 3C892 manual What is a network?