The **CPCI-R3915T** is a high-performance, 3U CompactPCI (CPCI) Rear Transition Module (RTM) designed specifically to complement the **CPCI-3915** series CPU boards. It serves as an interface bridge, routing I/O signals from the backplane to physical connectors at the rear of the chassis. --- ### ## Key Electronic Specifications The board is characterized by its high-density connectivity and adherence to industrial ruggedness standards. | Component / Feature | Description | | :--- | :--- | | **Form Factor** | 3U CompactPCI (Standard 100mm x 160mm) | | **Interface Standard** | PICMG 2.0 / PICMG 2.3 (PMC/XMC I/O) | | **Power Consumption** | Low power (Passive design; powered by the host CPU card) | | **Operating Temp** | -20°C to +70°C (Extended range versions available) | | **Compatibility** | Exclusively designed for the ADLINK CPCI-3915 Host Board | --- ### ### Core Electronic Subsystems #### 1. Signal Routing and Connectivity The electronic architecture focuses on high-speed signal integrity to prevent data loss across the backplane. It breaks out the following interfaces: * **Video:** Typically includes a VGA or DVI-D port via a high-density connector. * **Network:** 10/100/1000Mbps Ethernet ports (RJ-45) utilizing high-speed differential pairs. * **Storage:** SATA interfaces (standard 7-pin) for connecting rear-mounted SSDs or HDDs. * **Peripherals:** USB 2.0/3.0 ports and RS-232/422/485 Serial ports. #### 2. Protection and Filtering To ensure industrial reliability, the PCB incorporates: * **ESD Protection:** TVS (Transient Voltage Suppressor) diodes on all external I/O pins (USB/Ethernet) to protect against static discharge. * **Ferrite Beads:** Used to reduce Electromagnetic Interference (EMI) on high-speed data lines. * **Coupling Capacitors:** Placed on SATA and Ethernet lines to manage DC blocking and signal filtering. #### 3. Power Distribution While the RTM is largely passive, it contains power rails derived from the host board via the **J2 backplane connector**: * **3.3V / 5V Rails:** Distributed to power USB devices and active signaling chips (if present). * **Fused Circuits:** Many versions include resettable fuses (PTCs) on USB power lines to prevent short-circuits from damaging the main CPU. --- ### ### Typical Rear Panel I/O Layout ```text [ VGA / DVI ] <-- Video Output [ USB 1 ] <-- Peripheral Interface [ USB 2 ] [ LAN 1 ] <-- RJ45 Ethernet [ COM 1 ] <-- DB9 or RJ45 Serial ``` --- ### ### Summary of Usage The CPCI-R3915T is critical for systems where front-panel cabling is prohibited or where hot-swappability of the main CPU is required without disconnecting field wiring. It acts as a passive electronic extension, ensuring that all high-speed signals from the Intel processor on the main board reach the external world without degradation.