▁service ▁model . ▁It ▁can ▁be ▁used ▁to ▁carry ▁many ▁different ▁kinds ▁of ▁traffic , ▁including ▁IP ▁packets , ▁as ▁well ▁as ▁native ▁AT M , ▁S ON ET , ▁and ▁E ther net ▁frames . ▁ ▁A ▁number ▁of ▁different ▁techn ologies ▁were ▁previously ▁deployed ▁with ▁essentially ▁identical ▁goals , ▁such ▁as ▁Frame ▁Rel ay ▁and ▁AT M . ▁Frame ▁Rel ay ▁and ▁AT M ▁use ▁" labels " ▁to ▁move ▁frames ▁or ▁cells ▁throughout ▁a ▁network . ▁The ▁header ▁of ▁the ▁Frame ▁Rel ay ▁frame ▁and ▁the ▁AT M ▁cell ▁refers ▁to ▁the ▁virtual ▁circuit ▁that ▁the ▁frame ▁or ▁cell ▁res ides ▁on . ▁The ▁similarity ▁between ▁Frame ▁Rel ay , ▁AT M , ▁and ▁M PL S ▁is ▁that ▁at ▁each ▁hop ▁throughout ▁the ▁network , ▁the ▁“ label ” ▁value ▁in ▁the ▁header ▁is ▁changed . ▁This ▁is ▁different ▁from ▁the ▁forward ing ▁of ▁IP ▁packets . ▁M PL S ▁techn ologies ▁have ▁evol ved ▁with ▁the ▁strength s ▁and ▁weak ness es ▁of ▁AT M ▁in ▁mind . ▁M PL S ▁is ▁designed ▁to ▁have ▁lower ▁overhead ▁than ▁AT M ▁while ▁providing ▁connection - orient ed ▁services ▁for ▁variable - length ▁frames , ▁and ▁has ▁replaced ▁much ▁use ▁of ▁AT M ▁in ▁the ▁market . ▁ ▁In ▁particular , ▁M PL S ▁disp enses ▁with ▁the ▁cell - switch ing ▁and ▁signal ing - protocol ▁b agg age ▁of ▁AT M . ▁M PL S ▁recogn izes ▁that ▁small ▁AT M ▁cells ▁are ▁not ▁needed ▁in ▁the ▁core