Agilent Technologies HP 1660E Series User Manual page 274

Logic Analyzer Reference
Probing
Data Cable Characteristics Without a Data Pod
The HP 1660EP-series data cables without a data pod provide an ECL-
terminated (1 KW to -5.2 V) differential signal. These are usable when
received by a differential receiver, preferably with a 100-ohm
termination across the lines. These signals should not be used single
ended due to the slow fall time and shifted voltage threshold (they are
not ECL compatible).
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