Connect legacy ATDS equipment via Ethernet
Transparently extend ATDS serial (TADIL-A/Link 11) data communications over a network
The ATDS Bridge System connects Airborne Tactical Data System (ATDS) equipment via Ethernet. ATDS is a serial communications link conforming to MIL-STD-188-203-1A (Appendix D2). ATDS is used in equipment that supports Tactical Digital Information Link-A (TADIL-A) or its NATO designation Link-11. The Bridge provides a transparent hardware and protocol conversion that allows Data Terminal Set (DTS), Tactical Data System (TDS) and cryptographic equipment to communicate over a network without modification to either end. Moving the ATDS link to a network architecture eliminates cable length limitations and allows for implementation of redundant paths through the network fabric, greatly improving the survivability of the interface. With the Bridge System it’s now possible for ATDS equipment to connect virtually anywhere within the reach of a network connection.
Bridge System Architecture
The Bridge System consists of two servers, one connected to the legacy ATDS device at each end of the interface. The servers connect together over a dedicated or shared Ethernet network. In operation, the servers convert the ATDS channel protocol into Ethernet packets that are transmitted and converted back to ATDS at the distant end. The server is typically mounted near the legacy equipment to make the ATDS cable run as short as possible.
Each server runs a firmware protocol module that communicates with the legacy device on its end. At power up, the server initiates the protocol program with no user intervention providing automatic, transparent “pass-through” 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 in dual port mode, if one interface goes down, operation continues without delay or interruption on the surviving path.
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 space-saving 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 other boards in the backplane and operates identically to the other Bridge versions. ATDS 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 front- mounted ATDS 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.