19 Operation on an ISDN Access
222
ARGUS 152
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
-3
. In one
second, 64,000 bits are transferred, thus BitErrorRate (BER) = 10
-3
equates
to 64 bit errors.
US
Unavailable Seconds:
The number of all sequentially adjacent seconds (at least 10 sec) in which
BER > 10
-3
.
AS
Available Seconds:
The number of all sequentially adjacent seconds (at least 10 sec) in which
BER < 10
-3
.
DM
Degraded Minutes:
The number of minutes in which the bit error rate is greater than or equal to
10
-6
. In one minute, 3,840,000 bits are transferred, thus a BER = 10
-6
corresponds to 3.84 bit errors (3 errors = OK (no degraded minutes),
4 errors = NO (Not OK) (Degraded Minutes).
LOS
Loss of Synchronize:
Synchronization is lost at an error rate greater than or equal to 20% within a
period of a second. The absolute number of synchronization losses will be
shown.
