Agilent Technologies Auroraduet N1726A, Руководство пользователя, Страница: 180 / 507

Issue 01 - 06/99 4 - 39
Testing in Simulate Mode - Section 2
Layer 1 Alarms & Counters
LOS
Loss of incoming signal detected.
y = 255 consecutive zeroes have been received
n = at least 32 ones have been received in 255 bit times.
The error count increases every time the alarm is
switched from n to y.
AIS Alarm Indication Signal received.
y = less than 3 zeroes in 512 bits have been received
n = more than 2 zeroes in 512 bits have been received.
The error count increases every time the alarm is
switched from n to y.
LFA
Loss of Frame Alignment.
y = frame synchronisation has been lost
n = frame synchronisation has been achieved.
The error count increases every time the alarm is
switched from n to y.
RAI Remote Alarm Indication signal received.
y = Bit 3 of NFAS has been set to 1 on three
consecutive occasions
n = Bit 3 of NFAS is set to zero
The error count increases every time the alarm is
switched from n to y.
CRC Cyclic Redundancy Check 4 (CRC4) errors have been
detected. The error count increases every time a CRC4
error is encountered.
E Counts the number of multiframes with CRC errors, as
reported by the remote end of the connection.
FAS Displays the latest incoming FAS word in the multiframe.
NFAS
Displays the latest incoming NFAS word in the multiframe.
SLIPS Records the number of frame slips encountered. This is
used in MONITOR mode and when SIMULATE mode is
running as the clock master.
FAS
ERROR
Records the number of FAS words in error encountered
while frame synchronisation is achieved.
HDB3 CV Records the number of HDB3 code violations (bipolar
violations of the same polarity) encountered.
A-Sa5-Sa6 Records the last four distinct function elements that are
decoded in timeslot 0, with the most recent message first.
If there are no messages, a blank line is displayed.
Run Time Shows the number of seconds that the Layer
1
test has
been running. This is not reset when you exit the screen.
Chap4s2.PM6 17/06/99, 09:42 39