▁the ▁MO ▁Service ▁Framework ▁is ▁the ▁layer ing ▁of ▁services . ▁ ▁While ▁there ▁are ▁a ▁range ▁of ▁potential ▁services ▁identified ▁corresponding ▁to ▁different ▁types ▁of ▁mission ▁operations ▁information ▁that ▁are ▁ex changed ▁within ▁a ▁system ▁( status ▁parameters , ▁control ▁actions , ▁orb ital ▁data , ▁mission ▁tim elines , ▁etc .), ▁these ▁application ▁level ▁services ▁are ▁implemented ▁in ▁terms ▁of ▁a ▁smaller ▁set ▁of ▁generic ▁interaction ▁patterns ▁that ▁allow ▁current ▁status ▁to ▁be ▁observed , ▁operations ▁to ▁be ▁invoked ▁and ▁bulk ▁data ▁transferred . ▁ ▁This ▁has ▁two ▁key ▁benefits : ▁ ▁it ▁is ▁inher ently ▁extens ible , ▁as ▁new ▁services ▁can ▁be ▁over la id ▁on ▁the ▁existing ▁common ▁services ; ▁and ▁the ▁invest ment ▁made ▁in ▁MO ▁applications ▁is ▁further ▁isolated ▁from ▁the ▁implementation ▁technology . ▁ ▁Technology ▁ad ap ters ▁allow ▁the ▁underlying ▁communic ations ▁infrastr ucture ▁to ▁be ▁changed ▁( or ▁brid ged ) ▁with ▁minimal ▁impact ▁on ▁the ▁applications ▁themselves . ▁ ▁This ▁impro ves ▁long - term ▁maintain ability , ▁as ▁miss ions ▁often ▁out live ▁the ▁ground ▁technology ▁used ▁to ▁deploy ▁them ▁initially . ▁ ▁The ▁layers ▁of ▁the ▁Mission ▁Oper ations ▁Service ▁Framework ▁are : ▁ ▁The ▁Mission ▁Oper ations ▁( MO ) ▁L ayer ▁ ▁The ▁Common ▁Services ▁L ayer ▁ ▁The ▁Message ▁Ab stra ction ▁L ayer ▁( MA L ) ▁ ▁A ▁message ▁transport ▁layer ▁ ▁The ▁interface ▁between ▁each ▁layer ▁is ▁defined ▁in ▁the ▁CC SD S ▁standards ▁and ▁therefore ▁implementations ▁of ▁the ▁each ▁layer ▁can ▁be ▁replaced