This read-write integer (1..6000) sets the M32 logical port's egress queue threshold in bytes, below which the port will not begin queuing frames, defaulting to 6000; setting it too low can underutilize the port, and it is supported only on FRSM-8T1E1 and FRSM-4T1E1 service modules and not on FRSM12. An administrator tunes this to balance buffering efficiency against port utilization on those specific card types. For example, setting portM32EgrQueueThresh far below its 6000 default on an FRSM-8T1E1 port risks underutilizing that port, per the object's own guidance, even though it is only available on that and the FRSM-4T1E1 card.