Bit Sync Requirements

As shipped, the PCI Ingestor card in the SDI is configured to decode NRZ-L coded output from the bit sync, which is usually a programmable SDM-300A Satellite Data Receiver Modem from EF Data. For modem programming purposes, the data bit rate is 660 kilobits per second and uses QPSK (Quadrature Phase Shift Keying) with a 7/8 coding rate. The RS-422 output attaches directly to the SDI card via a user-built cable.

To build the cable, you will need a D15 male connector for connecting to the SDI, a D25 female connector for connecting to the SDM-300A and a suitable length of cable containing at least three twisted pairs of conductors. Use the table below for making the connections.

SDI 15-pin Female Pin Number	Conductor Color	EF Data 25-pin Male Pin Number	Signal Name
1	Blue	4	Data+
9	Blue/white	3	Data-
2	Orange	18	Clock+
10	Orange/white	17	Clock-
5	Green	7	Ground

If you use a different bit sync, or replace an SDM-300A in the future with a model that produces an NRZ-S output, you will need to reconfigure your PCI Ingestor card as described in Chapter 2 - SDI Installation.

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