Verilink PRISM 3301 (34-00239.5) Product Manual - Manual (Page 20)

12 C HAPTER 3: F RONT P ANEL I NTERFACE
BPV A BPV error (also known as a Line Code Violation) is two consecutive pulses of
the same polarity. The event is reported when a BPV rate greater than 10
-6
occurs
over a one-second interval. The event ends when the BPV rate is less than 10
-7
.
PAR ERR A Parity Error is reported when the C-bit parity error rate exceeds the rate of 10
-6
for 10 minutes. The event ends when the parity error rate is less than 10
-7
over a
10-minute interval.
REM PAR ERR The PRISM 3301 reports to the remote unit if a Parity Error (as described above)
occurs.
TX YEL The PRISM 3301 generates a transmit yellow alarm signal by toggling the X-bits
in the DS3 signal. The value of the X-bits to indicate a yellow alarm is
user-selectable. Receiving the Yellow Alarm is not an alarm condition, but an
advisory one. The condition is deactivated when the yellow alarm is no longer
received in the incoming signals.
TX AIS A Transmit Alarm Indication Signal is a signal transmitted in place of the normal
signal to maintain transmission continuity and to indicate to the destination
terminal that there is a transmission fault at or upstream from the source terminal.
The AIS is detected when the Bit Error Rate is 10
-3
or more. The condition is
deactivated when the ones density of the incoming signal, valid framing, and parity
meet the requirement.
LOSS SIG The PRISM 3301 reports an input Signal Loss condition when it encounters 128
consecutive zeros. When this condition is ended by a pulse, the alarm is cancelled.
LOSS FRM This error condition is reported by the PRISM 3301 when three errors in 16
consecutive F-bits are detected or when there is an error in the M-bit pattern in
two out of three or two out of four consecutive M-frames. This continues until 16
errorless F-bits; followed by three errorless M-bits or nine errorless M-bits have
been detected.
RX YEL The PRISM 3301 generates a receive yellow alarm signal by toggling the X-bits in
the DS3 signal. The value of the X-bits to indicate a yellow alarm is
user-selectable. Receiving the Yellow Alarm is not an alarm condition, but an
advisory one. The condition is deactivated when the yellow alarm is no longer
received in the incoming signals.
RX AIS A Receive Alarm Indication Signal is a signal transmitted in place of the normal
signal to maintain transmission continuity and to indicate to the destination
terminal that there is a transmission fault at or upstream from the source terminal.
The AIS is detected when the Bit Error Rate is 10
-3
or more. The condition is
deactivated when the ones density of the incoming signal, valid framing, and parity
meet the requirement.