EE/LM: This setting is targeted at Series 17 systems. Select BASIC for standard EE/LM configurations of 10 points. Select MULTIPLE if there are additional LM cards installed in the Master Switching Unit (MSU) or if there are External Switching Unit (ESU) modules with Latching Matrix or Latching Matrix Unit (LMU) modules attached to the MSU. For Series 10 systems, the EE/LM settings are configured with the switching in the DSC file.
Source: NETS User Manual, Revision D, document 132-06035-0006, section 3.2.6.