Block of data transmitted to the TDM attachment circuit and of a size defined in accordance with the [ITU-T G.826] rules for the corresponding TDM service that has experienced at least one CESoPSN/SAToP error event in the PSN to TDM direction(egress). For example, consider a T1/E1 Attachment Circuit Error Data Block for T1 = Error Event * (192 * Packet Latency) Error Data Block for E1 = Error Event * (256 * Packet Latency)