Nokia 7000 Series Benutzerhandbuch
6800/7000 Series - Distribution and Routing Products Installation and Operation Manual
5
Error Detection and Reporting
Chapter 1: AES-6880 AES/EBU Digital Audio Distribution Amplifier Module
Error Detection and Reporting
The AES-6880 DA constantly monitors the incoming AES data stream
and reports the following error conditions via the LED indicators
mounted near the card’s front edge. LED indicators and conditions are
described in the following table:
and reports the following error conditions via the LED indicators
mounted near the card’s front edge. LED indicators and conditions are
described in the following table:
Condition
Indicator
Description Of Condition
All OK;
No Errors
No Errors
Green LED
No errors detected.
No Lock
Red LED
Signal is not present or cannot be locked.
Biphase Coding
Error
Error
Red LED
Biphase coding of incoming date is
incorrect.
incorrect.
Parity Error
Red LED
SRD stream’s parity bit is not set as
specified.
specified.
CRC Error
Red LED
The CRC value calculated for the
incoming data does not match the CRC
byte of the channel status word.
incoming data does not match the CRC
byte of the channel status word.
Confidence Flag
Error
Error
Red LED
The received data eye opening is less
than a half-bit period, indicating a
possible lack of signal strength or high
jitter.
than a half-bit period, indicating a
possible lack of signal strength or high
jitter.
May also indicate that insufficient EA is
applied.
applied.
Validity Error
Red LED
AES stream’s validity bit is high.
The incoming data is not suitable for
conversion to an analog audio signal.
conversion to an analog audio signal.
Alarm
Red LED
Indication that the external alarm
contact closure is asserted, and this card
is reporting an alarm.
contact closure is asserted, and this card
is reporting an alarm.