/RECEIVE_ACCM=mask-value

    Identifies the starting Asynch Control Character Map (ACCM).
    This mask is used by the PPP driver to negotiate the final ACCM
    for asynchronous ports. Specify a mask in the range of 0x0 to
    0xFFFFFFFF. The default mask value is 0xFFFFFFFF, 0x0, 0x0,
    0x60000000, 0x0, 0x0, 0x0. The masks are ordered from low-order
    longword to high-order longword. Specify the longword mask until
    the last mask bits are set. The remaining longwords are set to
    0. With 8 longwords, there is 1 bit for every ASCII character
    position (from 0 to 255). The ASCII characters 0x20 through 0x3F
    and 0x5E cannot be quoted.