User manual
Table Of Contents
- Table of Contents
- About This Guide
- Introduction
- ISDN LAN Modem Functionality Description
- Hardware Description and Installation
- Setting Up TCP/IP for Windows and Macintosh
- Configuring the ISDN LAN Modem
- Advanced Configuration
- Before you Begin
- Setting Up Additional Service Providers
- Editing Service Provider Profiles
- Restricting Workstations from Accessing Service Provider(s)
- Configuring Your LAN Parameters
- Changing Data Call Parameters
- Changing Voice Call Routing
- Reserving DHCP Addresses
- Selective Password Protection
- Changing Your Password
- Setting Up Your ISDN Line Manually
- Locking and Unlocking the Configuration
- Configuring the ISDN LAN Modem from a Remote Location
- Supplementary Voice Call Services
- Placing, Receiving and Disconnecting Calls
- Troubleshooting and Maintenance
- Networking Primer
- What is a network?
- What is a LAN?
- What is a WAN?
- How does a LAN connect to a WAN?
- What is a LAN modem?
- What is ISDN?
- How do different devices communicate with each other?
- What is TCP/IP?
- What is an IP Address?
- What is a Subnet Mask?
- Dynamic and Static IP Addresses
- What is DHCP?
- What is DNS?
- What is NAT?
- What are numbered and unnumbered links?
- How is overall throughput determined?
- What is a network?
- Using the Custom Web Browser
- ISDN LAN Modem Factory Defaults
- ISDN LAN Modem Specifications
- Ordering ISDN Service
- If You Place Your ISDN Order Through 3Com
- If You Place Your ISDN Order Through the Telephone Company
- Supplementary Voice Features Included with U, EZ-ISDN-1, V and EZ-ISDN 1A
- Limitations of ISDN Ordering Codes U, EZ-ISDN 1, V and EZ-ISDN 1A
- What If I Already Have ISDN Service?
- Table of ISDN Ordering Code Capabilities
- Glossary
- Index
- 3Com Corporation Limited Warranty
18 C
HAPTER
2: ISDN LAN M
ODEM
F
UNCTIONALITY
D
ESCRIPTION
Figure 5
ISDN LAN Modem Single Workstation Connection Example
Application Sharing over the LAN
Most operating systems such as Windows 98 and 95 and Macintosh provide the
capability for users on the LAN to share applications, files and printers among
computers. For example, if only one computer has a Web browser, the other users
on the LAN can use that Web browser to access the Internet. Note that speed will
likely be reduced when applications are shared. Refer to your operating system
documentation for instructions on setting up sharing between users on a LAN.
WAN Side Connection
The ISDN LAN Modem allows users to connect to a WAN using either of the
following methods at one time.
■
Two separate connections to two different locations (one per B channel)
■
One high-speed Multilink PPP connection to a single location (combines both
B channels)
Once a WAN connection is established, up to 25 users can share that connection
and access the same location simultaneously. If you desire, you can also restrict
access to certain users.
Two Separate
Connections to Different
Locations.
An ISDN BRI line has two B channels for transmitting data or voice. Because each
B channel is independent, you can connect to two different locations. Once the
connection is established, up to 25 users can share either connection. Figure 6
shows one user connecting to a remote office LAN while another connects to the
Internet.
Figure 6
Two Simultaneous Remote Connections to Different Locations
OfficeConnect
®
ISDN LAN Modem
PWR
ISDN
B1
B2
3 Com
Alert
Tx
Coll
1
2 3 4
LAN STATUS
OfficeConnect
®
ISDN LAN Modem
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
Greg—64 Kbps B1
Peter— 64 Kbps B2
Greg
64 Kbps B1
Peter
64 Kbps B2
Greg's PC
Marcia's PC
Jan's PC
Peter's PC
OfficeConnect™
ISDN LAN Modem