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The PAP screen 3-7
Layer 1 status line
Layer 1 status indicators are decoded from the value at the end of the displayed line,
which is the sum of the individual hexadecimal values shown in the tables below. For
example, simultaneous Primary Rate SYNC (08) and SES (02) errors are displayed as:
Layer 1 Status Change 0A
The left half of the layer 1 status line displays network side indicators, the right half
displays user side indicators.
There are different indicators for Primary Rate and Basic Rate.
Primary Rate
The indicators are the same for both network and user sides, as shown below.
Basic Rate
The indicators are different for user and network sides, as shown in the tables over the
page.
Value Indicator Description
00 -- normal operation
01 ES Errored Second
02 SES Severely Errored Second
04 DM Degraded Minute
08 SYNC frame synchronisation lost
10 REM remote alarm
20 AIS Alarm Indication Signal (binary ones)