Current Hour Severely Errored Seconds threshold. This
threshold is used for both the transmit and receive
directions. When errors are detected that exceed this
threshold and the corresponding bit in the frxAlertMask
register is 0, the corresponding bit in the frxThCond
register is set and a trap is generated (depending on
the state of frxUPerfTrapEnable). Factory defaut is 10.
Indexed by Bank.ChannelUnit.Port.Address