baad mein, nirvaat tube ka istemaal kiya gaya. ye bahut tej the, lekin garmi utpann karte the aur filaameints ke jal jaane ke kaaran avishvasaneeya the. fainaaaut aam taur par paanch se saat the, jo tube ke vidyut se heeting dvaara seemit the. 1950 ke dashak mein, filaameint ke saath vishesh "computer tube" viksit kiye gaye jo silikaun ki tarah asthir tatvon ko nikaal dete the. ye kai hajaaron ghante tak chalte hain.

New York shahar mahanagar parivhan praadhikran ne ek RFID pareekshan kiya jismein maastarakaard dvaara pepaas ka upayog kiya gaya. yeh pareekshan mukhya roop se IRT leksingatan evenyoo line par kiya gaya jismein anya laainon ke kai vyast station bhi shaamil the. yeh pareekshan 31 May 2009 ko samaapt hua, lekin pepaas ke upayog ke vikalp ko vyaapak paimaane par baad ki taareekh mein pun: shuroo kiya ja sakta hai. MTA, New York shahar ke sabave aur bason par kiraaya bhugataan ke liye smaartalink (PATH dvaara shuroo) ko sveekaar karne aur antat: metrokaard ke ek pratisthaapan ke roop mein chalaane ki sambhaavana ka adhyayan kar raha hai.


kuchh pranaaliyon mein yadi digital deta ka ek bhaag lupt ho jaae ya galat tareeke se vyavahrut hon, to sambandhit deta ke vishaal khandon ka arth poori tarah se badal sakta hai. kyonki kleef ifekt ke kaaran, upayogakartaaon ke liye bataana mushkil hai ki koi vishisht system vifalta ke kagaar par sahi tha ya fir vah asafal hone se pehle bahut adhik shor ko sahan kar sakta hai ya naheen.
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