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
2
ISDN LAN M
ODEM
F
UNCTIONALITY
D
ESCRIPTION
This chapter provides a description of the key functionality of the ISDN LAN
Modem. It includes the following topics:
■ Connection Types
■ Call Routing Protocol and IP Address Translation
■ Understanding Multilink PPP and Bandwidth on Demand
■ Understanding Dynamic Bandwidth Allocation
■ Understanding PPTP
For a basic understanding of ISDN and networking, refer to Appendix A.
Connection Types
The ISDN LAN Modem provides LAN side and WAN side connections.
LAN Side Connection
On the LAN side, up to four users can connect to the LAN Modem’s built in
Ethernet hub, or up to 25 users may connect to the LAN Modem via an external
user-supplied hub, enabling users to share files and printers and to use Internet
email. An example of ten workstation connections is shown in An example of 10
workstation connections is shown in Figure 4.
Figure 4
ISDN LAN Modem LAN Connection with 10 Workstations
An example of a single connection is shown in Figure 5.
10 Mbps
Ethernet LAN
OfficeConnect
®
ISDN LAN Modem
PWR
ISDN
B1
B2
3 Com
Alert
Tx
Coll
1
2 3 4
LAN STATUS
OfficeConnect®
ISDN LAN Modem
OfficeConnect
®
Hub 8 TPO
Alert
PWR COLLPKT COAX1234
green = link OK, off = link fail, yellow = partition
Port Status
5678
1% 2% 3% 6% 12% 25% 50%80%
Network Utilization
Office
Connect
¤
Hub
3 Com