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hi Ed,

I believe that I had seen free .pdf manuals for the HP 70843b Error Performance Analyzer at the Kurt manuals site:




However, a small quick start manual is available at the Keysight:


Also, someone on the EEVblog may have some info on it:


An HP blurb about it:


Cables:
The DB-37 pin HP MSIB cables can simply be made with crimp-on flat ribbon cable connectors:



Let me know,
rick

Here is a list of the GaAs logic ICs used in the mux and demux modules. There are 12 pieces in each. I have found data sheets for a few, as shown, and a little descriptive stuff, and made some guesses based on the circuit topology. They were all made by NTT in the 1990s. If anyone knows of other info to fill in the blanks, it would be great.

TX 8:1 MUX
NL4515, 4pcs, no data, probably 2:1 mux, few GHz
NL4520-2, 1pc, have data - 3 GHz 1:2 clock distribution
NL4508, 1 pc, no data, probably a FF, few GHz
NLG4115, 3pcs, have data, 2:1 mux, 10 GHz
NLG4108, 2 pcs, no data, apparently 14.5 GHz TFF, used as clock divider
NLG4120, 1 pc, have data, 10 GHz 1:2 clock dist

RX 1:4 DEMUX
NL4506, 4 pcs, no data, probably few GHz 1:2 demux
NL4508, 1 pc, same as in MUX
NL4519, 1 pc, have data, 8 GHz 2-inp NAND, used as buffer
NLG4108, 1 pc, same as in MUX
NLG4120, 3 pcs, same as in MUX
NLG4104, 2 pcs, no data, probably 10 GHz 1:2 demux

It appears the NLG series are for full-speed sections around 10 GHz, while the NL series are slower, in the few GHz range. The HP70843B is spec'd to 12 Gbps, but probably at lesser performance beyond 10, or at high temperatures.

Ed