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17 • T1/E1 Link
T1/E1 DACS Administrators’ Reference Guide
120
Line Status (dsx1LineStatus)
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
window (see figure 43).
Figure 43. 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 Alarm Failure
Far End Alarm failure is also known as a
Yellow Alarm
in the T1 case or
Distant Alarm
in the E1 case.
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 sec-
ond and always less than 5 seconds. The Far End Alarm failure is not declared for D4 links when a Loss of Sig-
nal 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 con-
secutive occasions. The Far End Alarm failure is cleared when bit 3 of time-slot zero is received set to zero.
Summary of Contents for Model 2604
Page 18: ...About this guide T1 E1 DACS Administrators Reference Guide 16...
Page 22: ...1 Introduction T1 E1 DACS Administrators Reference Guide 20 Saving HTTP HTML Object Changes...
Page 46: ...6 Clocking T1 E1 DACS Administrators Reference Guide 44 Configuring the System Clock Settings...
Page 56: ...8 Filter IP T1 E1 DACS Administrators Reference Guide 54 Defining a filter...
Page 80: ...11 TCP T1 E1 DACS Administrators Reference Guide 78 TCP Details...
Page 84: ...12 UDP T1 E1 DACS Administrators Reference Guide 82 Introduction...
Page 90: ...13 RIP Version 2 T1 E1 DACS Administrators Reference Guide 88 RIP Version 2 Statistics...
Page 96: ...14 SNMP T1 E1 DACS Administrators Reference Guide 94 Out...
Page 108: ...15 System T1 E1 DACS Administrators Reference Guide 106 System Packet Holding Message Blocks...
Page 138: ...17 T1 E1 Link T1 E1 DACS Administrators Reference Guide 136 Far End Line Statistics Totals...
Page 148: ...20 License T1 E1 DACS Administrators Reference Guide 146 End User License Agreement...