FAQ PT-Family

On this page we will answer some of the questions relating to the products in the PT-Family. This information may help in your decision when looking for a product, installing the product, or can be used in the event of a problem when installing. The contents of the FAQs are the results of questions set to NovaTec and therefore can and will be regurlarly updated.

For which interfaces can the PT be used?

The PT Family supports the ISDN-BRI (S) Interface, the ISDN-U0-Interface and the ISDN-UP0 -Interface.

Which functions does the PT typically fulfil?

The main application of the PTs is divided into two groups. On the one hand the range extension, this concerns the S0 -Interface that has to be extended. You can find a couple of application examples here.

The second group concerns the Interface conversions, from BRI (S0) and U0 and/or BRI (S0) and UP0.  You can find a couple of example applications here.

Which technical requirements are necessary to consider in regards to the cable between the PTs, if I want to extend the range?

The maximum length between the PTs depends on the quality and thus the line loss of the cable. We have experienced that with a cable with a diameter of 0.6 mm ranges are reached of up to 8 km. In principle applies: the thicker the cable the higher the range. In the cable there should be no intermediate amplifiers or filters, which may restrict or interfere with the range. As an estimated limit value absorption of 40 dB with 40 kHz.

I would like to operate several terminals at the end of the cable. Can this be done?

No problem. The PT-US gives you a complete BRI (S0 )-Bus, which can be used to operate several end devices.

I would like to operate end devices both before and after the line terminals. Can this be done?

Unfortunately no. This will not work with the use of PTs, the end devices may be operated ONLY on the PT-US.

Instead of an ISDN telephone can I connect a switch to the PT-US?

Of course you can attach a switch instead of an ISDN telephone to the PT-US and connect two switches together.  Consider however that you have only two B-channels available (connections) over the connection between the switches per line. When planning you should examine whether this capacity is sufficient and if necessary increase the number of Connections.

Can the PTs be used with older switches that still used the 1TR6 protocol?

The PTs are protocol transparent, and therefore can be used with 1TR6, EDSS1 and most manufacturer specific protocols.

Can the PT-UPS be used on a switch that has a UP0 -Interface where a BRI/S0-End device needs to be connected?

This is the ideal operation of the PT-UPS. Please find detailed information under Solution > ISDN-Interface Conversion

How are the PTs supplied with mains power?

The main power supply is integrated in the PT, this should be plugged into the mains power the same as a normal plug.

Does the PT-SU require power feeding on the BRI (S0)-Interface?

For the actual function it doesn’t matter if there is power feeding on the BRI (S0) from the switch or not. The PT-SU passes this power over two internal 4.7 KOhm resistors to the U-Interface. This power can also be used to remotely turn the PT-US on and off. Please find detailed information under PT SU/US.

I would like to power the PTs with batteries, is this possible?

The PTs can be supplied as a special version with different voltages e.g. 110 V or DC voltage. For detailed information please contact our sales department.