HM-C703 single balun is for RJ45/RJ48(120ohm)-BNC(75ohm) conversion.
HM-C716 16ports G.703 balun is for 16xRJ45/RJ48(120ohm)-32xBNC(75ohm) conversion.
HM-C724 24ports G.703 balun is for 24xRJ21(120ohm)-48xBNC(75ohm) conversion.
HM-C724X 24ports G.703 balun is for 24xRJ45/RJ48(120ohm)-48xBNC(75ohm) conversion.