3Com AccessBuilder 500 User Manual - page 63

Examples of Typical ISDN Networking Applications

1-43

IP Host on the Same IP Network

If your organization operates a TCP/IP network and needs to extend the 

IP network over geographically remote sites, it is possible to bridge the 

network using the AccessBuilder 500. It is only possible to bridge where 

both sites have the same network address and the devices are on the 

same subnet. In a class C IP address, the network address is the first three 

groups of numbers. For example:

192.000.000.xxx

where 

xxx

 represents the host ID of the individual devices on the subnet. 

See 

“IP Addresses”

 in 

Appendix A

 for more information about addresses.

Typically IP bridging would be used to connect a back office or home 

office into a main site. Any further network connections would be 

carried out from the main site. An example of such a network is shown 

in 

Figure 1-22

.

During configuration, you enter the ISDN number and the IP addresses 

of any hosts to which you want to connect. In the example in 

Figure 1-22

, the IP address of the host 191.000.000.100 is used and only 

when data destined for this device is received by the AccessBuilder 500, 

is a call made to the remote site.

Figure 1-22   

IP Bridged Network