Trade.Information

Product Name: GA-540 Serial Data Link Translator

Product Description

The DRS GA-540 Serial Data Link Translator provides the interface in a TADIL A/Link-11 system between a serial encryption device and a tactical data system processor. The GA-540 serial interface to the encryption device meets the Airborne Tactical Data System (ATDS) interface requirements of MIL-STD-188-203-1A (Appendix D-2). All data buffering, timing and ATDS handshaking are performed automatically. The GA-540 connects to the tactical data system processor using one of the following interfaces:
RS-422/RS-423 Conditioned Diphase
Transformer-coupled Conditioned Diphase
RS-422/RS-423 Synchronous
RS-423 Asynchronous

The DRS GA-540 is offered as a 19-inch rack-mountable unit, as a 1/4-ATR-Short airborne unit or as a 6U-VME card. The rack-mounted and ATR units include a power supply, BIT indicator and panel mounted connectors. The VME card set can be hosted in any VME operating environment.

The ATDS interface conforms to the requirements of the standard serial cryptographic device. Transmit data are sent with the appropriate burst of clock pulses in response to each demand pulse from the Data Terminal Set (DTS). The recirculated data are checked on the board. If an error is detected, an ATDS fault pulse is generated and error status bits are set. The message status summary bits from the DTS are passed through with the received data to the tactical data system.

The VME port uses standard 24-bit addressing and 16-bit data (A24-D16). The board operates as a VME intelligent slave with dual-port RAM, dual-port registers for interprocessor communication, and programmable VME interrupt generation. Each ATDS Advanced Demand generates an interrupt whose level is programmable. In response to the interrupt, the entire Link-11 transmit data message can be written to the dual-port buffer. Thus, interrupts do not occur at frame time intervals, relieving the tactical data computer from responding to inconveniently timed interrupts. For very long messages, data transfer flags are used to meter the data transfer. Receive data are buffered into blocks of M-series messages. The receive data interrupt can be programmed to occur when 1 to 32 messages are in the buffer. All VME system level parameters such as VME addresses, interrupt levels, and interrupt vectors are user configurable. The RS-232 data interface on the VME card may be used while the card itself is hosted in a VME chassis.

Off-line Built-In Test routines can be executed from the tactical data processor interface. BIT executes in less than one minute and results are available for fault isolation.

Company Details

DRS Technologies, Inc., headquartered in Parsippany, New Jersey, U.S.A., is a leading supplier of integrated products, services and support to military forces, intelligence agencies and prime contractors worldwide. Focused on defense... more