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

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Step Command Remarks
3. Configure the interface
description.
description text
Optional.
By default, the description of an
interface is interface-name
Interface.
4. Enable external loopback on
the ISDN BRI interface.
loopback { b1 | b2 | both } Disabled by default.
5. Set the MTU for the BRI
interface.
mtu size
Optional.
1500 bytes by default.
6. Set the intended bandwidth
for the BRI interface.
bandwidth bandwidth-value Optional.
7. Restore the default settings for
the BRI interface.
default Optional.
8. Shut down the BRI interface.
shutdown
Optional.
A BRI interface is up by default.
Displaying and maintaining ISDN BRI interfaces
Task Command Remarks
Display information about the
specified ISDN BRI interfaces.
display interface [ bri ] [ brief [ down |
description ] ] [ | { begin | exclude |
include } regular-expression ]
display interface bri interface-number [ brief
[ description ] ] [ | { begin | exclude |
include } regular-expression ]
Available in any view.
Clear statistics on a specified ISDN
BRI interface.
reset counters interface [ bri
[ interface-number ] ]
Available in user view.
Configuring a CE1/PRI interface
Overview
In 1960s, the time division multiplexing (TDM) technology gained increasing popularity in data
communications systems along with the introduction of pulse code modulation (PCM) technology. So far,
there are two TDM systems in the data communications system:
• E1 system—Recommended by ITU-T and widely used in Europe and P.R. China.
• T1 system—Recommended by ANSI and widely used in North American and Japan. (Japan
actually uses the J1 system. It is regarded as a T1 system due to the high level of similarity between
them.)
A CE1/PRI interface can operate in either E1 mode (also called non-channelized mode) or CE1/PRI
mode (also called channelized mode).
1. A CE1/PRI interface in E1 mode is an interface of 2.048 Mbps data bandwidth, on which no
timeslots are divided. Its logical features are the same as those of a synchronous serial interface.