This read-only object, in MHz, reports the lowest frequency edge of the duplexer's high passband, the point below which signals in that band start being attenuated instead of passed through. It complements the low-passband objects by defining the boundaries of the second frequency range the duplexer supports. For example, an admin configuring p2mpDuplexerReceivePassband to use the high passband would first confirm the intended receive frequency sits above this minimum.