Keysight Technologies reported fiscal third-quarter revenue of $1.85 billion, up from $1.35 billion a year earlier, with orders of $2.09 billion [1]. That is a revenue gain of roughly half a billion dollars in a single year at a company whose business is selling the systems other manufacturers use to test electronics before they ship.

The earnings lines moved up on both accounting bases, and they are worth keeping apart. On a GAAP basis, net income rose to $397 million, or $2.30 in diluted EPS, from $191 million, or $1.10, a year earlier [1]. On a non-GAAP basis, which strips out items the company treats as non-recurring, net income was $531 million, or $3.07 per share, up from $297 million, or $1.72 [1]. The GAAP and non-GAAP figures are two different measures of the same quarter and should not be blended; the GAAP number is the one that follows standard accounting rules.

Almost all of the growth came from one place. The Communications Solutions Group delivered $1.345 billion in revenue, up 43 percent year over year, while the Electronic Industrial Solutions Group generated $501 million, up 21 percent [1]. Those two segments sum to about $1.846 billion, which matches the reported $1.85 billion total. Communications Solutions, the larger of the two, accounted for roughly three-quarters of the company's revenue and the bulk of the year-over-year increase.

The concentration is the part of the record that the top-line number smooths over. When one segment carries most of a company's growth, the same segment carries most of its exposure if the buying slows. Orders of $2.09 billion came in above the $1.85 billion of revenue recognized in the quarter, which points to a backlog that is still building rather than being drawn down. For now, that says demand for Keysight's test systems is running ahead of what it can bill, a healthy signal for a supplier. The question the report does not answer is how durable the surge in that one segment will prove to be.