3com MSR 20-20 참조 매뉴얼
18
ISDN BRI I
NTERFACE
C
ONFIGURATION
C
OMMANDS
loopback (ISDN BRI interface view)
Syntax
loopback { b1 | b2 | both }
undo loopback
View
ISDN BRI interface view
Parameter
b1: Places the B1 channel in external loopback.
b2: Places the B2 channel in external loopback.
both: Places both B1 and B2 channels in external loopback.
Description
Use the loopback command to sets the B1, B2, or both channels on the ISDN BRI
interface in external loopback. This can send data from a line back to the line.
interface in external loopback. This can send data from a line back to the line.
Use the undo loopback command to restore the default.
By default, loopback is disabled on ISDN BRI interfaces.
c
CAUTION: The modules with loopback-supported ISDN interfaces include 4BS
(MIM), and 1BS1BU2BS2BU (SIC). In addition, loopback is also supported by the
fixed ISDN interfaces on your router, if there is any.
(MIM), and 1BS1BU2BS2BU (SIC). In addition, loopback is also supported by the
fixed ISDN interfaces on your router, if there is any.
Example
# Place the B1 and B2 channels on interface BRI 1/0 in external loopback.
<Sysname> system-view
[Sysname] interface bri 1/0
[Sysname-Bri1/0] loopback both