Converters

NTDS to Ethernet Bridge System

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Connect legacy NTDS equipment via Ethernet

Transparent NTDS to network communication for tactical systems

The Bridge System connects legacy NTDS equipment via Ethernet. It minimizes the length of NTDS cable runs between computers, displays, mass storage devices, sensors or weapon systems while extending their communication range far beyond MIL-STD-1397C maximum distances. The Bridge makes the hardware and protocol conversions that allow the legacy equipment to communicate over existing NTDS channels without modification to either end and without awareness that the Bridge is in-between. Moving the long haul communications to a network architecture makes it easier to implement redundant paths through the network fabric, greatly improving the survivability of the interface. With the Bridge System it’s now possible for NTDS devices to connect virtually anywhere within the reach of a network connection. Cable bulk and weight are also greatly reduced.

Bridge System Architecture

The Bridge System consists of two servers, one connected to the legacy NTDS device at each end of the interface. The servers connect together over a dedicated or shared Ethernet network. In operation, the servers convert the specific NTDS channel protocol into Ethernet packets that are transmitted and converted back to NTDS at the distant end. The server is typically mounted near the legacy equipment to make the NTDS cable run as short as possible.

Channel Protocol

Each server runs a firmware protocol module that communicates with the legacy device on its end. The included generic protocol module can be used on most NTDS channels without modification. For channels with special requirements, protocol modules can be customized and uploaded permanently into the server’s non-volatile flash memory. At power up, the server initiates the protocol program with no user intervention providing automatic, transparent “passthrough” operation of the legacy channel.

Designed for Survival

The Bridge System is designed with dual Ethernet ports to significantly increase reliability. When configured to operate with both Ethernet ports, if one interface goes down, operation continues without interruption on the surviving path.

Hardware Options

The Bridge System can be implemented using various hardware versions. All versions are functionally compatible and can be different at each end of the legacy interface:

  • Single 6U VME Board Version – This spacesaving version installs in a vacant slot in an existing VME chassis. It only requires power from the VME backplane in order to operate and does not communicate over the VME data bus so no changes are required on the VME host system. It is completely independent from the rest of the hardware in the backplane and operates identically to the other Bridge versions, running the protocol module from its onboard flash memory. NTDS channels and Ethernet ports are connected at the board’s front bezel.
  • 19” Rackmount Version – The 19” rackmount version is self-contained with its own power supply. It occupies only 1U of rack space and has rearmounted NTDS and Ethernet connectors for efficient cable management. Its small form factor allows multiple units to be stacked in a central location forming a communications gateway or mounted separately where space is limited.
  • Rugged Version – The Rugged server is designed to meet the environmental specifications required for naval shipboard applications*. It offers the same capabilities of the other versions in a stand alone ruggedized enclosure.
Bridge System General Technical Specifications
  • NTDS Interface Options
    Parallel Types A, B, C or H
    Serial Types D or E
  • Parallel NTDS Connector Options
    M81511 (85 pin)
    M28840 (92 pin)
    D38999 (79 pin)
  • Serial NTDS Connector Options
    Standard navy shipboard
    Type D (coaxial BNC) or
    Type E (triaxial BNC)
  • Ethernet Port Options
    Dual ports with any combination of:
    10/100/1000BASE-T Copper
    1000BASE-SX Multi-mode Fiber
    1000BASE-LX Single-mode Fiber
    (Contact factory for current options)
  • NTDS - Ethernet Latency
    < 1 millisecond
Technical Specifications (Rugged)
  • Temperature (Operating)
    MIL-STD-810G, 0 to +50 C
  • Temperature (Non-operating)
    MIL-STD-810G, -40 to +70 C
  • Slide Rails
    N/A
  • Shock
    MIL-S-901D, Grade A, Type I, Lightweight
  • Vibration
    MIL-STD-167-1A Type I, 4-28Hz
  • Humidity
    MIL-STD-810G, 5% to 95% (non-condensing)
  • Electromagnetic Interference (EMI)
    MIL-STD-461F
  • Drip
    MIL-STD-810G
  • Structure Borne Noise
    MIL-STD-740-2
  • Airborne Noise
    MIL-STD-1474, Requirement 5, Equipment Grade A12
  • Altitude
    Operation to 15,000 ft.
    Transport to 40,000 ft.
  • Power
    MIL-STD-1399, Section 300B Paragraphs 5.3.1, 5.3.2, 5.3.3
    90-264 VAC, 47-440 hertz, single phase, 60 watts avg. consumption
  • Weight
    Under 20 lbs.
  • Dimensions
    4.76”H x 10.52”D x 11”W
  • FCC
    Part 15, Subpart B
  • CE
    EN55022, EN55024
  • Ethernet Ports
    2x 10BASE-T/100BASE-TX/1000Base-T Copper, 1000Base-LX Single-Mode Fiber, or 1000Base-SX Multi-Mode Fiber
  • Ethernet Connectors
    2x RJ-45 or 2x M28876.1B1S1 fiber optic connectors
  • NTDS Interface
    MIL-STD-1397C
  • ATDS Interface
    MIL-STD-188-203-1A, Appendix D2
  • RS-232 Connector
    DB9 male
Technical Specifications (1U 19” Rackmount)
  • Temperature (Operating)
    0 to +55 C
  • Temperature (Non-operating)
    -40 to +85 C
  • Slide Rails
    Included
  • Shock
    MIL-STD-810G
  • Vibration
    MIL-STD-167-1 Type I, 4-28Hz
  • Humidity
    MIL-STD-810G, 95% (non-condensing 20 to 60 C
  • Electromagnetic Interference (EMI)
    MIL-STD-461F (Optional)
  • Structure Borne Noise
    MIL-STD-740-2
  • Airborne Noise
    MIL-STD-1474, Requirement 5, Equipment Grade A12
  • Altitude
    Operation up to 15,000 ft.
    Transport to 40,000 ft.
  • Power
    100-240 VAC, 50-60 hertz, single phase
    65 watts avg. consumption
  • Weight
    Under 20 lbs.
  • Dimensions
    1.72”H x 11.19”D x 19”W
  • Ethernet Ports
    2x 10BASE-T/100BASE-TX/1000Base-T Copper, 1000Base-LX Single-Mode Fiber, or 1000Base-SX Multi-Mode Fiber
  • Ethernet Connectors
    2x RJ-45 or 2x ST fiber optic connectors
  • NTDS Interface
    MIL-STD-1397C
  • ATDS Interface
    MIL-STD-188-203-1A, Appendix D2
  • RS-232 Connector
    DB9 male
  • Display Interface
    DisplayPort (20-pin female)
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