Description: The number of SONET bytes of the Path or VT carried as payload within one packet. For example, for STS-1 SPE circuits, value of 783 bytes indicates that each packet carries payload equivalent to one frame. For VT1.5 circuits, a payload length of 104 bytes indicates that each packet carries payload equivalent to one VT1.5 super-frame. The actual payload size may be different, due to bandwidth reduction modes, e.g. DBA mode or dynamically assigned fractional SPE. This length applies to inbound and outbound packets carrying user payload. Although there is no control over inbound packets, those of illegal length are discarded and accounted for (see pwVcCepPerf...PktsBadLength.)