- Silver, 250 points or more
in ISDN word we use NT1 device, as i know, to convert between 2 wires (coming from telco) and 4 wires (going to s/T interface)
however i usually read that NT1 is used with BRI only. not with PRI.
can anyone confirm that we don't need NT1 with PRI ? and why ? is PRI cable coming from telco 4 wires ?