This object indicates on which TSs of the selected port, BERT should be applied. Each Bit of the Octet represents a TS: 31 ......0 MSB LSB Bit 0 will not be used. If the bit value is '1' - BERT should be applied on this TS. For a T1 port, the valid raised bits ('1') are: 1..25. For an E1 port, the valid raised bits ('1') are: 1..31. Agents that do not support this feature will send SIZE 0.