User guide

Maintenance 4-5
4
Error Statistics
DefaultÑNormal, default alarm status messages are displayed.
User-deÞnedÑenter up to 20 characters to replace the normal message.
Menu-2 Data Status
Menu-2 (Figure 4-2) shows the current status of the local and remote ports.
If the local or remote device does not have a port in this position the
parameter is blank.
Set Code Received Unit is receiving a set code.
Reset Code Received Unit is receiving a reset code.
Table 4-3 Menu-1 Alarm Input Status
Parameter Description
Error Free Seconds The percentage of seconds the unit does not have errors.
Errored Seconds Ratio Total number of errored seconds divided by all available seconds unit is
operating up to a maximum of 24 hour intervals, then multiplied by 100.
Severely Errored Seconds
Ratio
(Total number of severely errored seconds/24 hours total number of
available seconds) *100
Background Block Error
Ratio
(Background block errors/number of available blocks)*100.
Number of available blocks is (number of available seconds)*1000.
CRC4 Errors
(Cyclic Redundancy Check)
An error checking scheme used to check the received data. The last 6 frame
bits are calculated using the contents of the frame. The calculation is
performed again when the frame is received and the CRC values are
compared. If they do not match, the frame is considered bad and the CRC
statistic is incremented.
Code Violations An error checking scheme. A code violation occurs when the ones bit is not
represented with the opposite signal of the previous ones bit.
Table 4-2 Network Status
Condition Description