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NT1 and PRI

ohassairi
Level 5
Level 5

‎01-10-2012 10:59 PM - edited ‎03-04-2019 02:52 PM

hello

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 ?

thanks

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4 Replies 4

rais
Level 7
Level 7

‎01-11-2012 06:41 AM

PRI is delievered as 4-wire T1 line.

Thanks.

paolo bevilacqua
Hall of Fame
Hall of Fame
In response to rais

‎01-11-2012 03:40 PM

Not always.

first of all, OP has E1 not T1.

Second, E1 is some countries, E1 is delivered over unbalanced coax cables.

ohassairi
Level 5
Level 5
In response to paolo bevilacqua

‎01-11-2012 09:35 PM

so can we say that in all cases PRI does not need NT1 ?

0 Helpful

ajay chauhan
Level 7
Level 7
In response to ohassairi

‎01-11-2012 10:35 PM

I agree with Paolo.

Same time for E1/T1 balanced or unbalanced circuits NT1 is not at all required.

Thanks

Ajay

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