R2511-HP MSR Router Series Interface Configuration Guide(V5)

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Displaying and maintaining AM interfaces
Task Command Remarks
Display information about the
specified AM interfaces.
display interface [ analogmodem ] [ brief
[ down | description ] ] [ | { begin | exclude
| include } regular-expression ]
display interface analogmodem
interface-number [ brief [ description ] ] [ |
{ begin | exclude | include }
regular-expression ]
Available in any view.
Clear statistics on a specified AM
interface.
reset counters interface [ analogmodem
[ interface-number ] ]
Available in user view.
Configuring an ISDN BRI interface
Overview
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 services integrating 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 switched network and transmission
network and are converted into the analog signals again upon reaching the destination. ISDN makes it
possible to implement digital transmission on a user loop and achieves the end-to-end digitization. As a
standardized digital interface, ISDN BRI interface can be used to forward digital and analog information.
The standardization efforts that ITU-T made in provisioning the ISDN services make the implementation
of ISDN possible. The provisions of the recommendations I.430, Q.921, and Q.931 allow all the devices
meeting ITU-T ISDN provisions of unbarring ISDN network access.
The following is the provision standardizing the ISDN user-network interface.
ITU-T I.411 provides the referential ISDN user-network interface configuration as shown in
Figure 5 on the
basis of function group (a set of functions required for accessing an ISDN network) and reference point
(a concept used to differentiate function groups).
Figure 5 Referential ISDN user-network interface configuration
Function groups include: