Installation Manual

measuring the loop-resistance out and back. Compare your
readings to the following chart:
Pan / Tilt / Zoom / control signals
Video signals may co-exist in the same wire bundle with
twisted-pair control signals, such as RS-422, RS-485, etc.
Model numbers NV-314A and NV-418A will transmit “up the
coax” P/T/Z control signals up to 1,000ft (300m). Call NVT for
more details.
Power Supply Requirement
NVT transceivers require the following power:
NV-314A no power required
NV-418A & AR no power required
NV-518A & AR 12 to 16 VAC @200mA
power supply included
NV-RM15 12 to 16 VAC @2A
power supply included
The model NV-518A and NV-RM15 are intended to be
powered by a safety extra low voltage (SELV) power source
that delivers less than 60V DC under single fault conditions.
Additionally, a limited power source with less than 5A total
available current should be used, such as a pre-approved
wall-mount or desktop power supply that has been evaluated
by a product safety agency such as UL or TUV Rheinland, in
the country of end-use.
Ground Lifting
Ground loop immunity to differences in grounds are built into
all NV-518A units. This eliminates annoying ground loops that
may be found when connecting from building to building, or
floor to floor. Ground immunity is preserved when any
NV-518A unit is used with a passive device, such as the
NV-314A or the NV-418A.
Transient protection & surge suppression
Transient protection is built-in to the NV-518A and
NV-518AR.
Laying out your system
1. To save installation time, try to use existing wire. Assess
your existing telephone cable-plant within the site or sites.
Use a ‘toner-set’ (warbler) to locate wire paths in the wiring
closets and at each end of the wire runs.
Distance Wire Gauge AWG
feet m 1818
250 76 3 Ω
20
5 Ω
22
8 Ω
24
13 Ω
315 96 4 Ω 6 Ω 10 Ω 16 Ω
397 121 5 Ω 8 Ω 13 Ω 21 Ω
500 152 7 Ω 10 Ω 17 Ω 26 Ω
630 192 8 Ω 13 Ω 21 Ω 33 Ω
794 242 10 Ω 16 Ω 26 Ω 41 Ω
1000 305 13 Ω 20 Ω 33 Ω 52 Ω
1260 384 16 Ω 25 Ω 42 Ω 66 Ω
1587 484 21 Ω 32 Ω 52 Ω 83 Ω
2000 610 26 Ω 40 Ω 66 Ω 104 Ω
4. For RJ45 connections, it is recommended that pre-wired
patch-cords be used. If you must crimp RJ45 plugs onto
wire, be alert to the following common failures:
• Plugs designed for stranded wire used for solid wire.
• Plugs designed for round wire jacket used with
flat wire.
• Conductors not fully seated when crimped.
• Plugs installed with a low-cost crimping tool.
• Conductors going to wrong pins, miswired.
5 If the phone company is providing copper 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 back to the phone
company’s central office and back.
6. Due to near-end crosstalk, don’t send a transmit and a
receive signal in the same wire bundle. Exceptions: Less
than 1000 feet (300m), or Category 5 cable, up to 2000
feet (600 m) are OK.
7. Don’t send “Up-the-Coax” Pan/Tilt/Zoom signals through
active (amplified) NVT transceivers.
8. For safety, never put NVT signals in the same
conduit as high-voltage wiring.
9. WARNING — to reduce a risk of fire or electric shock,
do not expose this product to rain or moisture.
My building only has RJ-11 connectors
Use one of the methods below to convert:
Locating the other end of the wire
Consider using a pair of battery operated test devices called a
“toner” set (available from telecom supply houses). One unit
generates a distinctive audible warble signal. The other unit
has a probe and speaker. When this unit is near the correct
conductor, the warble can be heard.
Measure your wire distance
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
Pin 1
Video
Audio
Pin 8
Pin 1
Pin 6
Pin 1
Video
Audio
Pin 8
RJ-45
RJ-11
RJ-45
Introduction
NVT Multimedia Series Transceivers supply a campus wide
signal transmission solution that allows baseband
(composite) video to be transmitted over unshielded twisted-
pair telephone wire for distances up to 3,000 feet (900m)
without a repeater. Some models also transmit line-level
audio. These products do not transmit modulated or cable TV
type signals. The wide bandwidth video signals employed are
not compatible with “dial-up” telephone service.
With NVT’s patented crosstalk immunity, video signals may
reside in the same wire-bundle with other potentially interfer-
ing signals, such as ringing telephones, data
communication signals, or other video signals. One- or two-
way video signals may reside in existing in-house wiring.
Level/Category 2 (voice grade), 3 (data), 4 and 5 (high
speed data) wire are supported. Distances up to 4000ft
(1,3km) are achieved by repeating the signal along the way.
NVT video signals are sent without the need to digitize or com-
press (and without the signal degradation associated with
these techniques), and are designed for use with unshielded
twisted pair telephone wire.
NVT also manufactures a line of UTP-based CCTV transmis-
sion products, supporting distances up to one mile (1,5km).
Wiring Notes
Wire — The Dos
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 the NVT signal in or near
electromagnetic fields (in accordance with National
Electrical Code).
3. 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 con-
ductor, part of another pair).
Wire — The Don’ts
1. Do not use shielded twisted pair wire. It will severely
degrade the distance performance. Multi-pair wire with an
overall shield is OK. Short runs may be used with some
signal degradation (for example elevator traveler cables).
2. Don’t 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 the signal carrying twisted pair
is shorted to another wire or set of wires (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.
This installation should be made by a qualified
service person and should conform to all local codes.
Multimedia Product Installation Manual
NVT
TM