Current ISDN BRI integrated U interface Loop status and
NT maintenance mode. The definition of maintenance modes
are as follows:
none - The U interface is not in either Loopback or
maintenance mode.
type2Loopback - Type 2 (CO to U interface) Loopback
mode; this mode is set to perform the loopback between
CO and the ISDN BRI integrated U interface.
type3Loopback - Type 3 (processor to U interface) Loopback
mode; this mode is set by router to perform the loopback
between the router processor and the ISDN BRI integrated
U interface.
ntQuietMode - NT quiet mode; this mode is set by CO for
metallic loop tests. In the NT quiet mode, the ISDN U
interface will not attempt a start-up or will not
initiate transmission during metallic loop tests
conducted by the network.
ilmtMode - Insertion loss measurement test (ILMT); this mode
is set by CO for the Insertion loss measurement test.
The insertion loss measurement test will cause a known
test signal to be generated by the NT. This test will
be used in network measurements of DSL (Digital
Subscriber Line) transmission characteristics.