HM-PN08 PCM Multiplexer is for 8FXO/FXS+4FE+2RS232 over fiber solution.

HM-PN16 PCM Multiplexer is for 16FXO/FXS+4FE+2RS232 over fiber solution.

HM-PN32 PCM Multiplexer is for 32FXO/FXS+4FE+2RS232 over fiber solution.