NITEK - Products - Multi Channel Units - VH3251

Model

VH3251	32 Port Active UTP Video Hub;
	Up to 1,500 feet (450 meters) with passive transceivers

Description:

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 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.

Features:

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

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 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.
Impedence	100 Ohms +/- 20%
UTP Category	2 or better

NITEK - VH3251 - 32 Port Active UTP Video Hub; Up to 1,500 ft wit passive transceivers.

Product Specifications

VH3251 Spec	--	VH3251 dwg
VH3251 A&E Spec	VH3251 A&E Spec	VH3251 Visio
VH3200 Manual	--	--
TR515x8 Manual		--

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.

Product Drawing

System Drawings