32 port active video hubs with built-in surge suppression, ground loop isolation, gain and loss
control, and video detection. Systems operate with
other Nitek UTP video equipment including, video
transceiver hubs, standard video balun transceivers,
active transmitters, or any twisted pair equipped camera.
These active video hubs are multi-channel video receiver
devices that provide a low cost means of receiving quality
live video over category UTP cabling. The systems can
also adapt to existing communication and computer network
spare pairs, or new cable installations. The VH3256 can
be used on video runs up to 3,000 feet (900 meters) when used with passive
transmitters, or distances of up to 6,000 feet (1,800 meters) with the
Nitek TT560 active transmitter. These hubs provide superior immunity
from noise and interference, even when run in common raceways
with AC
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- Quality video over ordinary twisted pair cable
- Built-in surge suppression
- Built-in ground loop isolation
- Convenient access to DIP switches for accurate gain and loss control
- High immunity to noise and interference
- LED’s to indicate video detection
- Highly compact, only one rack unit in height
- Video can be run in the same cable with telephone, computer signals and power
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| Transceiver Unit |
| Size |
1 RU x 9.5" (D) |
| Power Requirements |
24 VAC @ 450mA
(Wall transformer provided with unit) |
| Video Input |
Balanced low voltage current loop |
| Video Output |
1 Vpp composite video
monochrome or color |
Common Mode
Rejection |
>70dB |
| Video Format |
RS170, NTSC, PAL, SECAM,
CCIR (Color or B/W) |
Twisted Pair
Connection |
Screw terminals providing balanced low voltage current loop |
| Operating Frequency |
DC to 10 MHz |
Recommended
Transmission Distance |
Up to 3,000 feet (900 meters)
w/Passive Baluns
Up to 6,000 feet (1,800 meters)
w/Active Transmitters |
| Transient Immunity |
Built-in |
| Temperature Range |
-20 degrees C to +55 degrees C |
| Humidity Range |
0 to 98% non-condensing |
| Enclosure Type |
Standard 19" rack 1 RU in height |
| Wire Spec |
26 to 12 AWG Unshielded
Twisted Pair (UTP) |
| DC Loop Resistance |
51 Ohms/1,000 feet (max)
(51 Ohms/300 meters) |
| Normal Capacitance |
17pF/ft. |
| Impedence |
100 Ohms +/- 20% |
| UTP Category |
2 or better |
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Wire and Cable Recommendations
Twisted Sender is recommended for use with unshielded
twisted pair (UTP) wiring. The systems will operate over wire
gauges from 26 AWG through 12 AWG but are optimized for 24
AWG. Category cabling may be used. Individually shielded
pairs should be avoided as they drastically reduce the operating
range of the systems. Multi-pair cable with an overall
shield is acceptable. Video can be operated in the same
communication cable coexistent with telephone, computer,
control signals, power voltages and other video signals. While
video may be routed through telephone punch-down block
terminals, any bridge-taps, also called T-taps and any resistive,
capacitive or inductive devices MUST BE removed from
the pair.
For more specific information regarding wire
types, gauges and proper installation techniques, please call
(800) 528-4343 for technical assistance.
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