Lantronix
ION x6010 User Guide
33493 Rev. F
Page 236 of 261
Alarm Indication Signal – Alarm Condition
In T1 mode, the criteria for declaring/clearing AIS detection are in compliance with the ANSI T1.231.
In E1 mode, the criteria for declaring/clearing AIS detection comply with the ITU G.775 or the ETSI
300233, as selected. The function is implemented in the LIU chip. When in E1 mode, application
software may select the AIS condition by changing the value in the LIU register accordingly. The
criteria
for AIS detection declaring and clearing is shown below.
ITU G.755 for E1
(LAC bit is set to ‘0’ by
default)
ETSI 300233 for E1
(LAC bit is set to ‘1’)
ANSI T1.231 for T1/J1
AIS
detected
Less than 3 zeros contained in each
of two consecutive 512-bit streams
are received
Less than 3 zeros contained in a
512-bit stream are received
Less than 9 zeros contained in an
8192-bit stream (a ones density of
99.9% over a period of 5.3 ms)
AIS
cleared
3 or more zeros contained in each of
two consecutive 512-bit streams are
received
3 or more zeros contained in a
512-bit stream are received
9 or more zeros contained in an
8192-bit stream are received
The x6010 AIS
Alarm
condition is shown below for both the CLI and the Web interface.
To clear the AIS
Alarm
condition from the CLI:
1.
Start (initiate) the TDM Loopback operation. Type
set tdm loopback oper=init
and press
Enter
.
2.
Stop the TDM Loopback operation. Type
set tdm loopback oper stop
and press
Enter
.
3.
Verify that the condition changed from
alarm
to
normal
. Type
show tdm port config
and press
Enter
.
