Telos ZephyrExpress user manual Interface Pinouts

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IMPORTANT!

The S interface, in US versions, provides power for the NT1. Disconnect any other power supply connected to the NT1. Failure to do so will result in damage to ZephyrExpress, the NT1, or both!

European units ÑÊindicated by a single ISDN connection and the Euro Telecom logo shown here ÑÊdo not provide power for the NT1. You may connect these directly to a powered NT1.

The S interface is a standard modular RJ-45 style jack. Ethernet 10Base-T cables work best for this application, and are available at most computer stores.

S Interface Pinouts

PIN FUNCTION

1N/C

2N/C

3S Transmit to network +

4S Receive from network +

5S Receive from network -

6S Transmit to network -

7PS2 Power -

8PS2 Power + (Top pin)

Pins 7 and 8 are not connected on units sold in North America.

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If you’re using a European ZephyrExpress in North America, you’ll need to provide your own NT1 and connect its Terminal jack to the S interface.

If you’re using a North American ZephyrExpress with an external NT1, you’ll need to provide an external power supply for the NT1.

When the U interface (below) is connected directly to the ISDN wiring, you can use the S interface jack to connect another device to the output of ZephyrExpressÕ internal NT1.

The most common use for this would be when ZephyrExpress is using one ISDN channel for audio transmission, and you want to use a separate ISDN telephone or computer terminal adapter on the other channel.

U Interface

This jack appears only on units shipped within North America. It can be connected directly to the ISDN wiring, to use ZephyrExpress’ built-in NT1 terminator. This is common practice in the US.

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