Nitek : VH3251
Description
The Nitek 32 port active video hub VH3251 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 VH3251 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 VH3251 can receive video up to 1,500 feet (450 meters) when used with passive transmitters. These hubs provide superior immunity from noise and interference, even when run in common raceways with AC.
Available Configurations Include:
| VH3251/110 | Active Video Balun Receiver Hub – 32 Ports – Selectable 100 feet to 1,500 feet – with 110 punchdown |
Features
VH3251 features include:
- 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
- LEDs 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
Specifications
| Unit | Transceiver |
| 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 1,500 feet (450 meters) with passive transceivers |
| 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. |
| Impedance | 100 Ohms /- 20% |
| UTP Category | 2 or better |
Resources & Documents
| vh3251_spec.pdf | Datasheet |