Exactly as described, this is a write-only field used to bulk-replace this profile's entire frame-size test list in one operation, accepting a comma-separated list of sizes. This exists specifically to avoid an operator having to add or delete frame sizes one row at a time in a separate frame-size table, letting a whole custom test-size list, for example matching a particular customer's typical packet-size distribution, be set in a single SNMP write instead of many. For example, writing "64,256,512,1024,1500" here in one operation would replace whatever frame sizes were previously configured for this profile's non-EMIX throughput and frameloss test legs.