Nitek UTP Video Balun - VB31M

Video Balun for UTP Category Cables

Model Number: VB31M

  • Video Balun Transceiver for use with Unshielded Twisted Pair cable
  • Transmits up to 750 feet (225 meters) with Passive Transceivers
  • Transmits up to 3,000 feet (900 meters) with Active Receivers
  • RJ45 connects to UTP category cables
  • Made in the U.S.A. Tech and Design support available at 800-528-4343

    Video balun with pigtail coax and male BNC for operation with other baluns or active receivers.

    The VB31M is a UTP video balun transceiver that serves as a UTP video transmission device converting coaxial signals for twisted pair transmission into UTP signals. The VB31M provides a low cost means of sending live video over UTP point-to-point wiring for distances of up to 750 feet (225 meters). The VB31M video balun transceiver operates with other passive CCTV baluns or active video receivers to provide CCTV transmission. Up to 1,500 feet (450 meters) with the TR515 single channel receiver and model 51 series hubs, and up to 3,000 feet (900 meters) with the TR560 single channel receiver and model 56 series hubs. A basic system uses (2) video balun transceivers, one at each end of a twisted pair of wires. These units are intended for use over existing in-house telephone wiring, Category 5 wiring or other twisted pair cable runs to provide a convenient, cost-effective alternative to coax. The VB31M is designed to provide superior immunity from noise and interference even when running next to line power. The VB31M is a UTP transceiver that provides another Security Transmission Solution from Nitek.

    • RJ45 jack connection for twisted pair
    • Quality video over ordinary twisted pair cable
    • Immunity to noise and interference
    • Passive devices - do not require power
    • Mini-coax pigtail for in-camera or dome mounting
    • Weather resistant design
    • Easier to install than coax
    • Compatible with all twisted pair equipped cameras, enclosures and domes


    • Intra-building CCTV installations (instead of coaxial cable)
    • Structured cabling (Cat wiring) environments
    • To eliminate requirement for Plenum Coax
    • Multi-camera applications through conduit (more cameras through a smaller diameter)

    Wire and Cable Recommendations

    The VB31M is recommended for use with unshielded twisted pair (UTP) wiring. The systems will operate over wire gauges from 26 AWG through 12 AWG. Category 2, 3, 4 or 5 cable 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.
     Transceiver Unit
    Size 0.9" (H) x 1.0" (W) x 2.0" (D) (not including coax)
    Power Requirements NONE REQUIRED
    Input 1 vpp composite video
    monochrome or color
    Output Balanced low voltage current loop
    Shipping Weight 1 lb for single unit
     System (2 Transceivers Required)
    Video Format RS170, NTSC, PAL, SECAM,
    CCIR (Color or B/W)
    Video Input 1 vpp composite video
    monochrome or color
    Operating Frequency DC to 10 MHz
    Common Mode Rejection >60 dB typ.
    Temperature Range -10 degrees C to +85 degrees C
    Humidity Range 0 to 98%, non-condensing
    Twisted Pair Connection RJ45 jack
    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

    Select a type of online documentation:

    VB31M Specification Sheet
    VB31M Installation Manual
    VB31M A&E Specification
    VB31M A&E Specification