SmartStep® Subsystems Cable Modem Testing (75Ω) & VoIP Testing Subsystems Mechanical Layout: o o o o o 800-1900 MHz frequency range 8 Input Channels to 1 Output Channel IEEE-488 Interface Wide Dynamic Range: 63/1 dB steps, 75Ω Aeroflex / Weinschel 3250T Programmable Attenuators with built-in driver circuitry. Simplified Block Diagram: FRONT PA NEL RF1 (J1) REAR PA NEL RF SYSTEM TEST FIXTURE AT1 A2 IEEE-488 SmartStep CONTROLLER ASSY DEVICE INTERFACE BUS (I2C) RF2 (J2) AT2 DEVICE INTERFACE BUS (I2C) RF3 (J3) A3 POWER COMBINER 3 4 2 1 IEEE-488 BUS S AT3 RF4 (J4) TP1 (J11) AT4 RF0 (J9) RF OUT (5.0-800 MHz) TP2 (J10) RF5 (J5) TEST PORT 1 1 2 4 3 S TEST POR 2 A4 POWER COMBINER AT5 RF6 (J6) AT6 DEVICE INTERFACE BUS (I2C) RF7 (J7) A5 POWER COMBINER 4 2 1 S AT7 +15± 1.7 V A3 POWER SUPPLY ASSY RF8 (J8) AT8 S1 POWER ON/OFF SWITCH/INDICATOR 20 3 XF1 AC INPUT PWR POWER ON/OFF 5305 Spectrum Drive, Frederick, MD 21703-7362 TEL: 301-846-9222, 800-638-2048 Fax: 301-846-9116 web: www.aeroflex.com/weinschel email: [email protected] Revision Date: 2/20/09