Nokia 6800 Series - Manual (Page 32)

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:
Condition Indicator Description Of Condition
All OK;
No Errors Green LED No errors detected.
No Lock Red LED Signal is not present or cannot be locked.
Biphase Coding
Error Red LED Biphase coding of incoming date is
incorrect.
Parity Error Red LED SRD stream’s parity bit is not set as
specified.
CRC Error Red LED The CRC value calculated for the
incoming data does not match the CRC
byte of the channel status word.
Confidence Flag
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.
May also indicate that insufficient EA is
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.
Alarm Red LED Indication that the external alarm
contact closure is asserted, and this card
is reporting an alarm.