The value of tmnxOamVccvPingCtlSaiiAcId specifies the attachment
circuit identifier of the Source Attachment Individual Identifier
(SAII) to be used when testing a FEC 129 AII Type 2 pseudowire.
At most one of tmnxOamVccvPingCtlSdpIdVcId and
tmnxOamVccvPingCtlSaiiAcId can be set to a non-default value on a
particular row.
A value of zero indicates that no attachment circuit identifier has
been configured.