-85-
When you press [STOP], the test pattern transmission and error rate measurement will end. Depending on the test
mode, the measurement will end automatically when the set conditions are met.
When the test mode is set to “
Repetitiously
” and several measurements are taken, you can swipe the screen left or
right to switch and display the measurement data.
You can switch and display the multiple measured data using [
▲
] and [
▲
].
You can display the first measurement data by [TOP/DEL] and the last measurement data by [END/X].
5.3 Contents of the Line Quality Data
You can measure the communication error rate with parameters which comply with ITU-T Recommendation G.821.
Item
Contents
Range of measurement
Remark
Savail
Effective time since the first synchroni
-
zation was established
0 ~ 9999999(sec)
1),2)
Receive bit
Number of received bits during syn-
chronization establishment
0 ~ 9999999 ~ 9.99E9
1)
Error bit
Number of bit errors
0 ~ 9999999 ~ 9.99E9
Bit error rate
Bit error rate
0.00E-0 ~ 9.99E-9
Sync loss
Number of loss of synchronization
0 ~ 9999
3)
Receive block
Number of received blocks during syn-
chronization establishment
0 ~ 9999999 ~ 9.99E9
4)
Error block
Number of blocks with bit errors
0 ~ 9999999 ~ 9.99E9
4)
Block error rate
Block error rate
0.00E-0 ~ 9.99E-9
4)
Error second
Time when bit error was detected dur-
ing Savail
0 ~ 9999
%E.F.S.
Errored second rate (%)
0.000 ~100.000(%)
5)
1) Synchronization
establishment
: When it receives normal data continuously for 32 bits
2) Effective time
:
It counts the time when the bit error rate per second is less than 0.1% as the effective time.
If the bit error rate of 0.1% or more continues for 10 seconds, that 10 seconds is excluded
from the valid time. After the exclusion, if the bit error rate is less than 0.1% for 10 seconds,
the 10 seconds are added and it restarts the counting.
3) Sync loss
: When more than 200 error bits occur in 512 consecutive bits.
4) 1 block length
: Number of bits for 1 cycle of test pattern.
5) %E.F.S
: (Savail) - (Error second)
(Savail)
