4000 Digital Series II Issue 2.1 Technical Manual
STA0381 Page 89
The card also provides dual clock circuits with auto-fail detected and changeover if this happens. LEDs
D3 and D5 show which clock is the master.
4.8.1 Card location
One of these cards must be located in RCU slot 2 in the 4920 matrix, or RCU slot 1 in the 4420 matrix.
4.8.2 Links
Before fitting this card the links should be checked to ensure that they are correctly set for the
application. Details of the link settings are given below.
The links on the circuit card are as follows:
• Links LK 1 - 8 (in two blocks of four, see above). These links are factory set and should not be
adjusted.
• Links 3 and 7 are set, the remaining links are unset.
• Link LK9 (see above). These links selects the sample rate, as follows:
• 0 - 42.7 KHz (standard for Broadcast applications)
•1 - 32 KHz
• 2 - 25.6 KHz
• 3 - 21.3 KHz
• 4 - 18.3 KHz
• 5 - 16 KHz (standard for ATC applications)
• 6 - 14.2 KHz
• 7 - 12.8 KHz
• Link LK10. This link is factory set and should not be changed.
• Link LK11. This link sets the internal/external powering of the GPI opto-isolators as defined
below:
• Pins 1-2 linked - opto-isolators powered internally from Vcc (not isolated) (default).
• Pins 2-3 linked - opto-isolators powered externally (fully isolated)
• No links - opto-isolators disconnected
4.8.3 Connector details
Table 8: PDE4663B - GPI Inputs
Description
Pin
Number
Description
Pin
Number
GPI Input 1 1 GPI Input 2 20
GPI Input 3 2 GPI Input 4 21
GPI Input 5 3 GPI Input 6 22
GPI Input 7 4 GPI Input 8 23
GPI Input 9 5 GPI Input 10 24
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