Hardware Installation
2−7CM 4000 Installation and Operating Manual
VDE EMI/RFI Modifications to Matrix Cables
User−supplied matrix cables for VDE installations require a ferrite core over each end of the cable, adjacent to the connector.
Figure 2−7. Matrix cable VDE modifications.
Type 43 material
0.375 inch (9.53 mm) or larger inside diameter
0.95 inch (24.13 mm) length (or longer)
Type 43 material sources
Fair−Rite, part no. 2643625102
Fair−Rite Products Corp., P.O. Box J, Commercial
Row, Wallkill, NY 12589, USA; Tel. (914) 895−2055.
Chomerics, part no. 83−10−A637−1000
Chomerics Inc., 77 Dragon Ct., Woburn, MA 01888
USA; Tel. (617) 935−4850.
System protection features
ALARM MODES
The CM 4000 master alarm is asserted when:
•The main CPU (or a main CPU task) is not operating properly, or
•The power supply is not operating properly, or
•The unit is in the process of rebooting.
The master alarm condition is indicated by a “00,” “01,” or “FF” indication on the front panel LED display, and at the rear
panel Alarm BNC connector. Electrically, the Alarm BNC operates according to SMPTE standard 269M−1999. When an
alarm is asserted, the circuit associated with the Alarm connector will present a low impedance to an external current source
circuit provided by the customer. Figure 2−8 shows the CM alarm circuit (left) and an example of a customer−supplied indica-
tor circuit (right).
EXTERNAL CIRCUIT
(EXAMPLE)
NOT TO EXCEED
24 VDC @ 20 mA
REAR−PANEL BNC
Figure 2−8.