For the frame modes, there are
PCM30, PCM30CRC, PCM31, and PCM31CRC for choice [10,11].
It generates and monitors
PCM30,
PCM30 CRC, PCM31 and PCM31 CRC frame structures on G.703-2Mbit/s.
Extrusion was performed using an Ikegai
PCM30 extruder equipped with a set of twin screws, L/D = 17.