Nokia 6800 Series Error Detection and Reporting, Condition Indicator Description Of Condition

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;	Green LED	No errors detected.
No Errors
No Lock	Red LED	Signal is not present or cannot be locked.
Biphase Coding	Red LED	Biphase coding of incoming date is
Error		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	Red LED	The received data eye opening is less
Error		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.

6800/7000 Series - Distribution and Routing Products Installation and Operation Manual 5