Studer D950 Operating Instructions Manual page 643

9.3.2.2 LEDs of the MEMNET Card, 2nd Generation
FAIL
IDLE
SYNC
IF 1
Card number
Connectors
RS 232
Date printed: 03.09.03
FAIL The red FAIL LED on a working card normally should be off. It is on
whenever the card fails or it is reset either manually or by the system.
IDLE The green IDLE LED has a special meaning on the MEMNET card. Its
flashing rate depends on how much communication is going on. The busier
the system communication is, the higher is the flashing rate. No flashing
could mean that the PC system is not working, or that the MEMNET flash
EPROM is being erased.
SYNC The green SYNC LED turns on whenever a valid AES/EBU SYNC input
signal is fed to the MEMNET SYNC input, and the system has locked to
the external clock. When the LED is off the core operates from its internal
48 kHz clock source.
IF 1 When the IF 1 LED is on, the optical-fibre link to the PC is valid. When it
is off, either the core or the PC is shut down, or the optical link is broken.
The card number has no real meaning on a MEMNET card during normal
operation and should simply be set to a non-zero value. When the card is
reset while this number is zero, the flash EPROM memory will be erased.
This can be useful when the core system must be forced to reload a con-
figuration for whatever reason.
The interface (SC connector) is used to connect the core to the Control PC.
When the connection is done properly, the IF1 LED will be green.
RS 232 This serial interface is used only for card testing during manufacturing.
Do not connect anything during normal operation!
SW V3.3
D950 Digital Mixing System
1.950.620.20
Troubleshooting/Maintenance 9-7