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SDI Input Connectors (50Ω SMA) 30-inch FR4 Trace (Input SDI0) Control/Indicator LEDs 15-inch FR4 Trace (Input SDI1) DC Power Connectors External Control Header Control DIP Switches Control Headers SMBus Connector (not active) SDI Output Connectors (50Ω SMA) 27 MHz Reference Crystal LMH0356 SDI Reclocker 30-inch FR4 Trace (Test Coupon) 27 MHz Reference External Input Figure 1. SD356EVK board Although the SMA coaxial connectors are ruggedized for attachment to the edge of the SD356EVK PC board, they can be damaged by over-tightening them. A standard SMA torque wrench with a torque limitation of 7-10 in-pounds should always be used to connect cables to the connectors on the SD356EVK. Do not allow heavy cables to hang unsupported from the connectors as they may break off the board. SD356EVK User Manual Rev 1.0 2 of 11 © 2008, National Semiconductor Corp.