Videolarm qodc2-50na Betriebsanweisung

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UNSHIELDED TWISTED PAIR 
VIDEO WIRING

NOTE:  The customer must purchase the Video Transceiver from 
             NVT.  Part numbers are:
                       • NV-212A (500 ft.)
                       * NV-213A or NV-213A-M (1000 ft.)
                       • NV-652R, NV-862R, or NV-1662R (3000 ft.)

The cameras included in the Q-View™ series have the option of  
transmitting video signals to NVT receivers via unshielded twisted 
pair cable. You must purchase the receiver separately. Instructions for 
connecting the receiver end of the the unshielded twisted pair cable 
will be included with the NVT receiver. Following are instructions for 
connecting the unshielded twisted pair cables to the RJ45 (Cat. 5) 
cable running outside your housing.

1. Video for all four cameras is contained in the one RJ45 (Cat. 5) 
    cable. An RJ45 female coupling is provided so that all connections 
    can be made with an RJ45 connector. The following is the wiring 
    diagram for the four twisted pair wires that are included with the 
    Cat. 5 cable.

  1        White/Green               Camera 1 +

  2        Green                         Camera 1 -

  3        White/Orange             Camera 2 +

  6        Orange                       Camera 2 -

  5        White/Blue                  Camera 3 +

  4        Blue                            Camera 3 -

  7        White/Brown               Camera 4 +

  8        Brown                         Camera 4 -

2.  Connect the other end of the unshielded twisted pair cable to the 
     NVT receiver.  
     CAUTION:  The unshielded twisted pair video signal is polarity
                         dependent. The positive video wire for each camera   
                         MUST be connnected to the postitive terminal on the 
                         NVT receiver, and negative MUST be connected to 
                         negative.

3.  When using unshielded twisted pair cable you DO NOT need the 
     BNC connector.  All four BNC connectors are provided inside the 
     housing for testing purposes. Be sure that there is no video con-
     nection other than the unshielded twisted pair cable.  

Wiring Notes

Wire — What to DO

1. DO use point-to-point Unshielded Twisted Pair wire, gauge 24 or 

thicker, stranded or solid, Category 2, 3, 4, or 5. 

2. The video signal may co-exist in the same wire bundle as other 

video, telephone, data, control signals, or low-voltage power. It 
is also OK to run NVT video signals in or near electromagnetic 
fields (in accordance with National Electrical Code, local, or other 
local safety requirements).

3. DO measure the wire distance. Use only transceivers that are 

designed for that distance.

4. DO make sure the pair of wires carrying the video signal is sent 

as a twisted pair

 

(e.g. the blue-white/white-blue wires twisted 

together as a pair), not a “split-pair” (e.g. blue-white conductor, 
part of one pair/orange-white conductor, part of another pair).

Wire — What NOT to DO

1. DO NOT USE SHIELDED TWISTED PAIR WIRE. It will severely 

degrade the distance performance. Short runs may be used with 
some signal degradation (for example elevator traveler cables). 
Multi-pair wire with an overall shield is OK. 

2. DO NOT USE UN-TWISTED WIRE. It will reduce the NVT   

product’s inherent interference immunity.

3. DO NOT allow your installation to have “bridge-taps”, loading 

coils, talk-battery, or MOV type protectors. Bridge-taps are where 
a twisted pair is connected to two twisted pairs (such as an 
extension phone at home). Bridge-taps cause reflections as the 
signal propagates, resulting in “ghosts” in the video image, and 
are to be avoided. 

4. If the phone company is providing the cable runs between 

buildings, make sure it’s “dry copper” i.e. it should have none 
of the following: dial-tone, 48 volts, loading coils, bridge-taps, 
switching, or long paths to the phone company’s central office 
and back.

5. Due to near-end crosstalk, DO NOT send a transmit and a 

receive signal in the same wire bundle. Exceptions: Less than 
1,000 ft (300m), or Category 5 cable, up to 2,000 ft (600m) are 
OK.

6. DO NOT send “Up-the-Coax” Pan/Tilt/Zoom signals through 

active (amplified) NVT transceivers.

Note: All NVT quoted distance specifications include any coax in the 
run. It is recommended that the wire distance be measured to ensure 
that the capability of the NVT product is correct. 

Wire resistance may be measured with an ohm-meter by shorting 
the two conductors together at the far end, and measuring the loop-
resistance out and back. Compare your readings with the charts on 
the next page.

7. For safety, never put NVT signals in the same conduit as 

high-voltage wiring.

8. WARNING — to reduce a risk of fire or electrical shock, do 

not expose this product to rain or moisture.

When the desired focus is achieved for each camera, adjust the 
segmented bracket arms to the desired viewing angle. Once you've
fi nished, put the dome back in place and check to be sure none of the 
cameras touch the dome. If one or more do, readjust the arm(s) until 
they are clear of the dome.