Axel Electronics 771 Telephone Line Simulator

images via this auction

"Axel Electronics Telephone Line Simulator Model 771
'The 770A Telephone Line Simulator can simulate the worst case amplitude and envelope delay characteristics of transmission lines and can generate a number of random transmission line effects which are especially important to digital date transmission. These are Pulse Jitter, Phase Hit, Amplitude Drop-Out, Amplitude Hit, Frequency Shift, Nonlinear Distortion, Random Noise and Impact Noise. The amplitude, frequency and timing of these impairments can be introduced and controlled by an operator individually or in any combination.'"

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Update: you can find a video demo by Hainbach posted here.

I also added the higher res pics hosted on Flickr to this post.

SN 771028