Indicates current state of the Vtuc line. This is a bit-map of possible conditions. The various bit positions are: Bit 00 : There no defects on the line Bit 01 : Vtuc failure due to not receiving valid frame. Bit 02 : Vtuc failure due to not receiving signal. Bit 03 : Vtuc failure due to loss of power. Note: the Agent may still function. Bit 04 : Loss of Signal Quality is declared when the Noise Margin falls below the Minimum Noise Margin, or the bit-error-rate exceeds 10^-7. Bit 05 : Vtuc failure due to inability to link with Vtur. Bit 06 : Vtuc failure during initialization due to bit errors corrupting startup exchange data. Bit 07 : Vtuc failure during initialization due to peer ATU not able to support requested configuration Bit 08 : Vtuc failure during initialization due to incompatible protocol used by the peer ATU. Bit 09 : Vtuc failure during initialization due to no activation sequence detected from peer ATU. This is intended to supplement ifOperStatus.