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4 Operation on a PRI Access
Characteristic values (in accordance with ITU-T G.821)
HRX
Defines the hypothetical reference connection
EFS
Error Free Seconds:
The number of seconds in which no error occurred.
ES
Errored Seconds:
The number of seconds in which one or more errors occurred.
SES
Severely Errored Seconds:
The number of seconds in which the bit error rate is greater than 10
In one second, 64,000 bits are transferred, thus BitErrorRate (BER) = 10
to 64 bit errors.
US
Unavailable Seconds:
The number of all sequentially adjacent seconds (at least 10 sec) in which
-3
BER > 10
Available Seconds:
AS
The number of all sequentially adjacent seconds (at least 10 sec) in which
-3
BER < 10
DM
Degraded Minutes:
The number of minutes in which the bit error rate is greater than or equal to 10
In one minute, 3,840,000 bits are transferred, thus a BER = 10
3.84 bit errors (3 errors = NO (no degraded minutes), 4 errors = OK (Degraded
Minutes).
LOS
Loss of Synchronize:
synchronisation is lost at an error rate greater than or equal to 20 % within a
period of a second.
The absolute number of synchronisation losses will be shown.
30
.
.
.
-3
-3
equates
-6
.
-6
corresponds to
ARGUS PRI
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