Chapter 1: AES-6880 AES/EBU Digital Audio Distribution Amplifier Module | Error Detection and Reporting |
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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.
External Alarm Configure | |
J3A Validity | J3 |
J3B Confidence | A |
B |
J3C CRC | C |
J3D Parity | D |
E |
J3E Biphase Code | F |
J3F No Lock | |
| AU TO EQ | |
| MANU SELECT | EXTERNAL ALARM CONFIGURE |
| AL | J3A VALIDITY |
| M AN UAL |
| J3B CONFIDENCE |
| EQ ADJU ST |
| | J3C CRC |
| ALL OK | J3D PARITY |
| NO LOCK | J3E BIPHASE CODE |
| J3F NO LOCK |
| |
BIPH ASE COD E | J3 |
|
PARITY | A |
CR C | B |
CON FIDENC E | C |
D |
VALID ITY | E |
| F |
ALAR M | |
Figure 1-4. AES-6880 Jumper Selection
6 | 6800/7000 Series - Distribution and Routing Products Installation and Operation Manual |
