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DVR395/DVR396-002 Page 12 of 30
installations, but especially in multi-service environments, should use high-quality shielded
cables, with the shield grounded according to good engineering standards.
1.4.1.2 Ferrite Installation
For this installation, there are three ferrites that are larger than the others. These should be used
for the cables numbered 6, 7, and 8 in the list below. These are the relay cables, the video cable,
and the S-Video cable. The other five cables will normally have a smaller total diameter, and
should fit into the smaller ferrites.
These ferrites must be installed on cables attached to the following connectors:
Connector
Ferrite Size
1. Audio 1 Left Small
2. Audio 1 Right Small
3. Audio 2 Left Small
4. Audio 2 Right Small
5. Serial Port Small
6. Alarm and Closure Relays. Large
One ferrite for all wires to relays.
7. Video Large
8. S-Video Large
The cables must pass through the ferrite and then loop around and pass through again. See
Figure 1
(Page 11). For proper results, the core should be positioned on the cable as close to the
chassis connector as possible. With minimal slack in the loop, the wiring alone should properly
support the core. No additional support should be necessary.