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Page 11
Page 11 of 30 DVR395/DVR396-002
1.4 REAR PANEL CONNECTIONS
The DVR395 rear panel connections are shown and described in Figure 2 (Page13).
Figure 1. Ferrite Bead Installation For DVR396
1.4.1 Ferrite Cores And Their Installation
In order to meet FCC requirements for Radiated Emissions, this unit must have Ferrites installed
on certain cables. Failure to install these cores may allow interference with other equipment,
resulting in degraded audio and/or video signals. Eight ferrite cores have been shipped with the
unit, and should be installed per the following instructions.
As a basic rule, all cables or wires to any one connector are looped through one ferrite. This is
particularly important to the relay outputs (See Figure 1
(Page 11).
1.4.1.1 Types Of Ferrites
There are two different types of ferrites included with the unit – three large and 5 smaller ones.
Both types are made to clamp on a loop of the cable(s) and minimize electronic signals being
radiated from the cable.
This is necessary because cables carrying electronic signals often act as broadcast antenna,
sending “Radio” signals to other cables, which can “Receive” them and inject them into other
units’ signals, causing interference with the other signals. To reduce this as much as possible, all
GND
COM
N/O
N/C
RF IN
R
L
R
AUDIO
2
CONTACT RATING 0.1A @ 30VDC
CLOSURE
L
AUDIO
1
MODE
16
PORT
SERIAL
ALARM
+
1
-
S-VIDEO
OUT OUT
VIDEO
-
2
+
S/N