The GT5900 Carrier ships pre-configured with selected I/O card(s). The package includes two three-foot interface cables for connecting UUTs at J10 and J11. These connectors are male 68-pin SCSI, VHD (very high-density) connectors. Two standard 50-pin, high-density ribbon cables are also provided for connecting GT5900 I/O Module headers to GT25/50-DIO I/O connectors.
The GT25/50-DIO uses a 50-pin, high-density connector and ribbon cable to interface with the UUT. That cable is rerouted to a 50-pin header on the GT5900 board (J4 or J5). The UUT connects to one or both tandem VHD connectors (J10 or J11). An external Interface Board may be required to adapt a 50-pin UUT cable to the Carrier’s VHD connectors (see the next section).
The Carrier also connects to a single-ended Timing Module from a Master GT5150 (68-pin connector, J3) or GT25/50-DIO (50-pin header, J12). It converts these to differential UUT I/O signals or shifts the level, depending on the daughter I/O Module. These signals include external event lines and external clocks.
On board power inverters create –5VDC and –12VDC at 2.5A from +12VDC or +5VDC PC bus inputs. These inverters provide the high current at negative voltages demanded by the GT5930 Programmable Level I/O module and GT5940 PECL I/O module.
The GT515X board is negative current limited at –5 and –12 volts. That is because most computers provide very limited current capacity at –5 volts, and limited capacity at –12 volts. The GT5900 Carrier board generates higher negative currents at these voltages than most computers do. A negative current limited I/O Module on a GT515X board can obtain higher current by connecting to J14 on the Carrier through a 4-wire ribbon cable.
J14 can also be used to accept additional negative current from a remote power supply to assist in providing power to the Carrier’s mounted I/O modules.