Samsung CLP-610 - Manual (Page 66)

10.3
<Specifications>
a. Printing speed: it will be affected by operating system used, computing
performance, application software, connecting method, media type, media
size, and job complexity.
b. ppm: page per minute.
c. ipm: image per minute.
d. Declared yield value in accordance with ISO/IEC 19798.
e. Noise Level: sound pressure level, ISO 7779.