Bitmap of whether each channel on this TDM port is assigned for use by this logical link. A channel cannot be assigned to a logical link if the channel is unavailable in the TDM port configuration (full/fractional/E1/T1), the channel is already assigned to another logical link, the channel is on a different TDM port from other channels in this link, or the logical link would have more than 32 channels assigned. Bit 0 is for the first channel, bit one for the second, etc. For products with RS530 ports, this item is ignored. The channels used will be configured automatically from the serial port bitrate whenever this table entry is updated.