▁but ▁also ▁has ▁a ▁site ▁in ▁Hud ders field ▁for ▁dimensional ▁met ro log y ▁and ▁an ▁under water ▁ac oust ics ▁facility ▁at ▁W ray s bury ▁Res er voir . ▁ ▁Pack et ▁switching ▁ ▁Begin ning ▁in ▁the ▁mid - 1 9 6 0 s , ▁Donald ▁Dav ies ▁and ▁his ▁team ▁at ▁the ▁N PL ▁pione ered ▁packet ▁switching , ▁now ▁the ▁dominant ▁basis ▁for ▁data ▁communic ations ▁in ▁computer ▁networks ▁world wide . ▁Dav ies ▁designed ▁and ▁proposed ▁a ▁national ▁data ▁network ▁based ▁on ▁packet ▁switching ▁in ▁his ▁ 1 9 6 5 ▁Pro pos al ▁for ▁the ▁Development ▁of ▁a ▁National ▁Communic ations ▁Service ▁for ▁On - line ▁Data ▁Process ing . ▁Sub sequently , ▁the ▁N PL ▁team ▁( D av ies , ▁D erek ▁Bar ber , ▁Roger ▁Sc ant le bury , ▁Peter ▁Wil kin son , ▁Keith ▁Bart lett , ▁and ▁Brian ▁Ald ous ) ▁developed ▁the ▁concept ▁into ▁a ▁local ▁area ▁network ▁which ▁operated ▁from ▁ 1 9 6 9 ▁to ▁ 1 9 8 6 , ▁and ▁carried ▁out ▁work ▁to ▁analy se ▁and ▁simulate ▁the ▁performance ▁of ▁packet - switch ed ▁networks , ▁including ▁dat agram ▁networks . ▁Their ▁research ▁and ▁practice ▁influenced ▁the ▁AR P AN ET ▁in ▁the ▁United ▁States , ▁the ▁for er un ner ▁of ▁the ▁Internet , ▁and ▁other ▁research ers ▁in ▁the ▁UK ▁and ▁Europe . ▁ ▁N PL ▁was ▁also ▁involved ▁in ▁intern etwork ing ▁research . ▁Dav ies , ▁Sc ant le