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Line Status (dsx1LineStatus) 292
Models 2616RC, 3096RC & 3196RC Admin Reference Guide 20 • T1/E1 Link
Line Status (dsx1LineStatus)
This variable indicates interface line status. It contains loopback, failure, received alarm and transmitted alarm
information. If any condition other than No Alarms exists, you can click on the Alarms Present link to view the
Line Status Alarms page (see figure 163).
Figure 163. Line Status Alarms window
The alarms currently present on the line will be indicated by the ACTIVE label next to the alarm type.
Failure States
The following failure states are reported in the dsx1LineStatus object. The items listed in this section comprise
those contained in RFC 1406—Definitions of Managed Objects for the DS1 and E1 Interface Types.
Far end LOF or Yellow Alarm (Far End Alarm Failure)
Far End Alarm failure is also known as a Yellow Alarm in the T1 case or Distant Alarm in the E1 case. It occurs
under the following conditions:
• For D4 links, the Far End Alarm failure occurs when bit 6 of all channels has been zero for at least 335 ms.
The alarm is cleared when bit 6 of at least one channel is non-zero for a period T, where T is usually less
than 1 second and always less than 5 seconds. The Far End Alarm failure is not declared for D4 links when
a Loss of Signal is detected.
• For ESF links, the Far End Alarm failure is declared if the Yellow Alarm signal pattern occurs in at least 7
out of 10 contiguous 16-bit pattern intervals. The alarm is cleared when the Yellow Alarm signal pattern has
not occurred for 10 contiguous 16-bit signal pattern intervals.
• For E1 links, the Far End Alarm failure is declared when bit 3 of time-slot zero is received set to 1 on two
consecutive occasions. The Far End Alarm failure is cleared when bit 3 of time-slot zero is received set
to zero.