This object configures the G.Bond port low downstream rate crossing alarm threshold. When the current value of gBondPortStatDnDataRate for this port reaches/drops below or exceeds this threshold, a gBondLowDnRateCrossing notification MAY be generated if enabled by gBondTemplateLowRateCrossingEnable. This object is read-write for the -O subtype G.Bond ports. It is irrelevant for the -R subtypes - attempts to read or change this object for such ports MUST be rejected (in case of SNMP with the error inconsistentValue). This object maps to the TR-159 attribute aGroupThreshDownUpRate.