10Base-T/100Base-TX/E3 Converter
Operating Manual
IOA170-1A 9
January 2006
•
Number of available seconds – AS
•
Number of unavailable seconds – UAS, 10 subsequent SES changes the status of the line into
unavailable, 10 seconds without SES returns availability status
•
Number of total seconds of operation from the moment of turning on the converter – TS
AS number = TS – UAS
Table 3-3 shows interpretation of receiving direction events for 34368 kbit/s signal..
Table 3-3. Events table
Type of event per 1 second
Interpretation
1 LOS – Loss Of Signal at input
ES + SES
1 LOL – Loss Of Lock
ES + SES
10
-6
– error rate
ES
10
-3
– error rate
SES
The number of events pertaining to the quality of exceeding thresholds is counted in 15-minute
and 24-hour intervals in registers located in the device.
15-minute registers create a stack of at least 16 registers of past periods. When all registers are full
the contents of the oldest 15 minute period may be lost.
The operator may read and sets thresholds for 15-minute and 24-hour registers. Quality thresholds
for the 15-minute period should be set in a range from 1 to 900 whilst the default values should be
the following: for ES – 120 and for SES – 15. There is not threshold value specifications in norms
for the 24-hour period. Quality thresholds for the 24h period should be set up within a range from
0 to 86400.
Fig. 3-1 defines the equipment’s unavailability definitions.
Unavailability detection
Unavailable period
Available period
Time
Availability detection
Severe errored second
Errored second without SES
Non errored second
10 seconds
10 seconds
10 seconds
Fig. 3-1. Device unavailability.
3.5 Event Log
The converter is equipped with a defined criteria event time and date registration function
containing the following types of events:
•
appearance or loss of signal at the E3 linear interface
•
deviation of the recovered clock by 0,5% from the E3 standard
•
exceeding or falling below the 10
-3
block error rate threshold of the receiving signal
from E3 linear interface
•
exceeding or falling below the 10
-6
block error rate threshold of the receiving signal
from E3 linear interface
•
exceeding or falling below the user defined fifteen-minute count threshold of the ES
(ES15) counter
