Configuring An Am Interface; Isdn Bri Interface; Overview - 3Com MSR 50 Series Configuration Manual

104 C 4: WAN I
HAPTER
Configuring an AM
Interface

ISDN BRI Interface

Overview

C
NTERFACE ONFIGURATION
Theoretically, if the peer (usually an ISP) uses a digital modem, the AM interface
can establish connection with V.90 Modem standard to provide downstream rates
up to 56 kbps and upstream rates up to 33.6 kbps. If the peer (usually a common
user) uses an analog modem (or an AM interface), the AM interface can establish
connection with V.34 Modem standard to provide rates (both downstream and
upstream) up to 33.6 kbps.
The real rate of an AM interface, however, may deviate somewhat depending on
line quality, PBX performance, connection protocol, and other elements.
Follow these steps to configure an AM interface:
To do...
Enter system view
Enter AM interface view
Set the area code
Set asynchronous interface
properties
n
To set the baud rate for an AM interface, use the speed command in
user-interface view. Refer to
related information.
The configuration of AM interface is similar to that of asynchronous interface and
modem, except that an AM interface does not support the modem auto-answer
and the baudrate commands. (Refer to
information about modem configuration.)
You may need to configure parameters concerning PPP, DCC, IP addressing,
firewall and backup center. For their configuration, refer
page 367, "DCC Configuration" on page
page 623, "Firewall Configuration" on page
Configuration" on page
Technical background
Integrated services digital network (ISDN) is a technology rising in 1970s. It
provides all-digital terminal-to-terminal services and fulfills the full digitized
delivery of the services integrated voice, data, graphics and video.
ISDN is different from the conventional PSTN network. In a conventional PSTN
network, user information is transferred as analog signals over analog user loop to
exchanges where these analog signals are converted into digital signals. These
digital signals traverse the digital switching and transmission network and are
converted into the analog signals again upon their reach at the destination. ISDN
makes it possible to implement digital transmission on a user loop and fulfills the
end-to-end digitalization. As a standardized digital interface, ISDN BRI interface
Use the command...
system-view
interface analogmodem
number
country-code area-name
See "Configuring an
Asynchronous Serial
Interface" on page 100.
"User Interface Configuration" on page 2155
"Modem Configuration" on page 355
153, "IP Addressing Configuration" on
1789, and
1961.
Remarks
--
Required
Optional
united-states by default
Optional
for
"Configuring PPP" on
"Backup Center
for