Comtech EF Data SDM-2020 - Manual (Page 150)

SDM-2020 Satellite Modulator Revision 7
Data Interfaces MN/SDM2020M.IOM
12-3
Figure 12-2 illustrates the SMPTE 310M module assembly.
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J6
J5
J4
J3
Figure 12-2. Module Assembly, Part NO. AS/6175-2.
12.1.3 SMPTE-310M D
ATA
I
NTERFACE
S
PECIFICATIONS
Table 12-1. Specification Summary
Video Interface (Terrestrial)
Signal Type Biphase mark coded synchronous serial data per SMPTE-310M and TM 1449.
Connector Type 75 Ω BNC.
Interface and
Connector
Impedance Resistive 75 Ω unbalanced, per SMPTE-310M.
TX and RX Signal
Level 800 mV ± 10% per SPMTE-310M.
DC Offset 0.0 V ± 0.5 V.
Rise And Fall Times The rise and fall times, determined between the 20 and 80% amplitude points
shall be within 0.4 ns and 5.0 ns and shall not differ by more than 1.6 ns, per
SMPTE-310M.
Overshoot 10% maximum (on both rising and falling edges) per SPMTE-310M.
Receiver Sensitivity The receiver shall operate with up to 3 dB amplitude loss at 1/2 the interface
clock.
Return Loss 30 dB minimum, 100 kHz to the interface clock frequency per
SMPTE-310M.
ATSC Data Rate 8VSB: 19.392 658 46 Mbit/s = (4.5 E6) x (684/286) x (564/313)