ination ▁res istor ▁connected ▁across ▁the ▁two ▁w ires . ▁ ▁Without ▁term ination ▁resist ors , ▁signal ▁ref lections ▁off ▁the ▁unter min ated ▁end ▁of ▁the ▁cable ▁can ▁cause ▁data ▁cor ruption . ▁ ▁Term ination ▁resist ors ▁also ▁reduce ▁elect rical ▁noise ▁sens itivity ▁due ▁to ▁the ▁lower ▁imped ance . ▁The ▁value ▁of ▁each ▁term ination ▁res istor ▁should ▁be ▁equal ▁to ▁the ▁cable ▁characteristic ▁imped ance ▁( typ ically , ▁ 1 2 0   oh ms ▁for ▁tw isted ▁pairs ). ▁The ▁term ination ▁also ▁includes ▁pull ▁up ▁and ▁pull ▁down ▁resist ors ▁to ▁establish ▁fail - safe ▁bias ▁for ▁each ▁data ▁wire ▁for ▁the ▁case ▁when ▁the ▁lines ▁are ▁not ▁being ▁driven ▁by ▁any ▁device . ▁ ▁This ▁way , ▁the ▁lines ▁will ▁be ▁bi ased ▁to ▁known ▁volt ages ▁and ▁nodes ▁will ▁not ▁interpret ▁the ▁noise ▁from ▁und ri ven ▁lines ▁as ▁actual ▁data ; ▁without ▁bias ing ▁resist ors , ▁the ▁data ▁lines ▁float ▁in ▁such ▁a ▁way ▁that ▁elect rical ▁noise ▁sens itivity ▁is ▁greatest ▁when ▁all ▁device ▁stations ▁are ▁silent ▁or ▁un power ed . ▁ ▁Standard ▁ ▁The ▁E IA ▁once ▁l abeled ▁all ▁its ▁standards ▁with ▁the ▁prefix ▁" RS " ▁( Re comm ended ▁Standard ), ▁but ▁the ▁E IA - T IA ▁officially ▁replaced ▁" RS " ▁with ▁" E IA / T IA " ▁to ▁help ▁identify ▁the ▁origin ▁of ▁its ▁standards . ▁The ▁E IA ▁has ▁officially ▁dis band ed ▁and ▁the ▁standard ▁is ▁now ▁maintained