The DDC DDC-71412-2 is a 1553 matrix cable engineered for MIL-STD-1553B data bus integration. It delivers signal integrity across dual-redundant balanced-line topologies in laboratory and aircraft environments. This twisted-shielded pair cable supports one to four independent 1553 channels with transformer-coupled or direct-coupled configurations, making it essential for avionics test systems and military command/response networks operating at 1 Mbps.
## Technical Specifications
• **Cable Type:** Twisted-shielded pair
• **Characteristic Impedance:** 78 Ohms nominal (70–85 Ohms at 1 MHz); 100 Ohm and 75 Ohm variants available
• **Capacitance:** Maximum 30 pF/ft
• **Attenuation:** Maximum 1 dB/100 ft at 1 MHz
• **Shielding Coverage:** Minimum 75%
• **Twist Rate:** Minimum 4 twists per foot
• **Data Rate:** 1 Mbps (transceivers capable to 5 Mbps)
• **Bus Voltage (Direct Coupling):** 1.4–20 V peak-to-peak
• **Bus Voltage (Transformer Coupling):** 1.0–14 V peak-to-peak
• **Cable Length:** 8.25 inches noted
• **Isolation Resistors (Direct Coupling):** 55 Ohms ±2%, or 0.75 Z₀ ±5%
• **Maximum Stub Length (Direct Coupling):** 1 foot
• **Maximum Stub Length (Transformer Coupling):** 20 feet
## Key Features
• Compatible with twinax bayonet (TRB) connectors for lab environments
• Supports MIL-DTL-5015 and MIL-DTL-38999 circular connectors for airborne applications
• Dual-redundant, balanced-line physical layer architecture
• Time-division multiplexed, half-duplex command/response protocol
• Transformer coupling preferred for enhanced fault tolerance and impedance matching
## Compatibility & Integration
Designed for integration with DDC BU-65569iX series PCI cards supporting multiple dual-redundant 1553 channels. Remote terminals, bus controllers, and monitors operate independently. Conforms to MIL-STD-1553B specifications and accommodates both transformer and direct coupling configurations.
