Each cable product that is received into DPL Labs for testing is specified by its manufacturer with a DPL Cable Identifier. Some firms may request more than one test. That is strictly up each individual firm. A Special DPL Label is provided for each product sold and will have one identifier marked on the label.
Devices under test (DUT) receive a series of tests that challenges the integrity of each device measuring the following parameters:
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1) Mask Margin The amount of headroom the Eye Pattern can achieve over and above the HDMI minimum specification measured in % |
 Typical Eye Pattern Measurement |
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2) Inter-Pair Skew The timing errors between all TMDS channels. |
 Typical Inter-Pair Skew Measurement |
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3) I2C Integrity The capacitance and rise-time levels on the DDC (Digital Data Channel) |
 Typical Rise Time Measurement |
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4) Supply Voltage This is where the DDC channel receives its voltage level. Spec calls for 5 volts and no lower than 4.7 volts. This measurement measures the amount of voltage lost over the distance of each device. |
 Supply Voltage |
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Aggregate Rating A total of 5 samples of each model are required for consistency measurements. With these measurements a score is computed producing a DPL Rating. Rating levels begin with a DPL 1 and end with DPL 5. A DPL 1 represents HDMI Minimum specifications and DPL 5 represents the highest integrity with maximum throughput. |
 DPL Rating Aggregation Chart |
The result is a single number DPL Rating between 1-5 based on the following matrix:
