This read-create octet string encodes the first 2048 bits of a 4096-bit vector identifying which SVLAN IDs (1 through 2048) are assigned to this service instance, where each set bit marks an assigned SVLAN. An admin sets this bit vector when configuring an SVLAN-list-based service instance to specify exactly which lower-range SVLAN IDs should be matched into this instance. For example, setting only the bit corresponding to SVLAN 100 in hh3cEvcSrvInstSvlanIdListLow assigns just SVLAN 100 to this service instance from the lower ID range.