Verilink PRISM 3301 (34-00239.5) Product Manual Manual de usuario descargar pdf (Pagina 20)

12 CHAPTER 3: FRONT PANEL INTERFACE

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.

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Verilink PRISM 3301 (34-00239.5) Product Manual Manual de usuario Pagina 20

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