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KB6NU
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Re: DB-9, DE-9
KB6NU   1/24/2014 9:35:45 AM
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Hmmmmm. That makes sense, too. Now that you mention it, I do recall seeing D connectors with those power pins.

MeasurementBlues
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Re: DB-9, DE-9
MeasurementBlues   1/24/2014 8:53:45 AM
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@KB6NU

The letters actually refer to the connector shell size and are really independing of the number of pins. For example, a DB shell could have fewer than 25 pins. Some have two or even three heavy pins (one for power, 2 for return) and some signal pins. The reason the the 9-pin is designated DE is because it was developed after A, B, C, and D, sizes.

KB6NU
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Re: DB-9, DE-9
KB6NU   1/24/2014 8:02:12 AM
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That's amusing. Despite using those connectors for longer than I care to mention I never knew that. It's amusing how the letter and number are redundant, too.

MeasurementBlues
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DB-9, DE-9
MeasurementBlues   1/16/2014 1:59:36 PM
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Officially called DE-9? (See page 3)

That's what I thought until about a year ago. Everybody thinks DB-9, DB-25, etc. but no.





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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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