Nokia 6800 Series - Manual (Page 33)

Chapter 1: AES-6880 AES/EBU Digital Audio Distribution Amplifier Module Error Detection and Reporting
6 6800/7000 Series - Distribution and Routing Products Installation and Operation Manual
User Configurable Contact Closure Alarm Indicator
A red LED mounted under the Error LEDs on the front edge of the DA
card provides a user-configurable Contact Closure alarm indicator.
When this LED is on, the external alarm contact closure is asserted,
indicating an error has occurred.
Jumpers J3A-F are used to determine which error conditions will trigger
the alarm (see Figure 1-4 below). When all of the jumpers are in place,
any of the condition errors will trigger the Contact Closure alarm to be
asserted. If one of these jumpers is removed, then the error condition
associated with the missing jumper may occur but will not trigger the
Contact Closure
alarm to be asserted and the Alarm LED will not light.
Whenever the contact closure alarm is asserted, the Alarm LED will light
and an alarm Contact Closure signal will be sent out.
Figure 1-4. AES-6880 Jumper Selection
AES-6880
AU
T
O
MAN
U A L
EQ SEL
EC
T
M AN UAL
EQ ADJU ST
ALL OK
NO LOCK
BIPH ASE COD E
PARITY
CR C
CON FIDENC E
VALID ITY
ALAR M
EXTERNAL ALARM CONFIGURE
J3A VALIDITY
J3B CONFIDENCE
J3C CRC
J3D PARITY
J3E BIPHASE CODE
J3F NO LOCK
A
B
C
D
E
F
J3
A
B
C
D
E
F
J3
External Alarm Configure
J3A Validity
J3B Confidence
J3C CRC
J3E Biphase Code
J3F No Lock
J3D Parity