Lucent Technologies PortMaster Manual Do Utilizador
12-1
Using ISDN BRI
12
This chapter describes how to configure the PortMaster to connect two local area
networks (LANs) via ISDN using V.25bis dialing on a Basic Rate Interface (BRI) with an
integrated network termination device (NT1). This chapter also provides an example to
demonstrate this type of configuration.
networks (LANs) via ISDN using V.25bis dialing on a Basic Rate Interface (BRI) with an
integrated network termination device (NT1). This chapter also provides an example to
demonstrate this type of configuration.
For information on the PortMaster 3 and ISDN PRI service, see Chapter 11,
“Configuring the PortMaster 3.”
“Configuring the PortMaster 3.”
This chapter discusses the following topics:
•
•
•
•
•
See the PortMaster Command Line Reference for more detailed command descriptions and
instructions.
instructions.
Overview of ISDN BRI Connections
ISDN is most commonly used to provide low-cost connectivity between sites that cannot
justify the cost of a dedicated high-speed leased line. However, ISDN connections
provide more bandwidth than asynchronous dial-up connections can, as well as quicker
call completion—approximately 1 second instead of 45 seconds.
justify the cost of a dedicated high-speed leased line. However, ISDN connections
provide more bandwidth than asynchronous dial-up connections can, as well as quicker
call completion—approximately 1 second instead of 45 seconds.
PortMaster products support manual dial-on-demand and automatic ISDN connections
using the BRI port and the PPP protocol. BRI supports two 64Kbps B channels for data
and one 16Kbps D channel for signaling. ISDN ports are available as either a U or S/T
interface.
using the BRI port and the PPP protocol. BRI supports two 64Kbps B channels for data
and one 16Kbps D channel for signaling. ISDN ports are available as either a U or S/T
interface.
ISDN ports are easier to configure than asynchronous or synchronous ports. Because the
ISDN U interface has the NT1 device integrated in the port, no modem, CSU/DSU, or
external terminal adapter is required.
ISDN U interface has the NT1 device integrated in the port, no modem, CSU/DSU, or
external terminal adapter is required.