This read-write Integer32, either 0 or 64 to 9600 bytes, applicable only to Y.1731 probes, specifies the TLV size for Delay Measurement Frames (DMMs); a value of 0 is read-only when the probe protocol isn't y1731, and GE206 Release 4.4.x supports up to 2000 bytes. It sets the size of the Y.1731 delay-measurement frames this probe sends, affecting how representative the measured delay is of actual service frame sizes. For example, setting DmmPktSize near the service's typical frame size on a GE206 running 4.4.x firmware, capped at 2000 bytes there, gives a more realistic delay measurement than the protocol's smaller default.