The digital AC line interface for the professional user.
Particularly suitable for universal use.
The FT634/NL series line interface is an alternative to the FT633-AC/NL line interface, and can be used both at the transmitter/receiver and for adaptation of a keypad to make it suitable for 2- or 4-wire (leased) lines with channel switching. The basic model of the FT634/NL is pin and function compatible with the well-known FT632 AC/NL line interface. The FT634-C/NL version has the ability to switch channels remotely with a suitable keypad, e.g. the Major 4/NL or the Major 5/NL.
Key features in brief:
- Connections for a (leased) line both for 2- and 4-wire
- Transmitter control with hebulp of a pilot tone (3300 Hz)
- Pilot tone suppression with hebulp of high-quality digital filters
- Reliable pilot display coding in case of unfavourable impendance ratios of the connected (leased) line
- Adjustable equaliser to compensate the frequency response of a bad (rental) line
- Switch on transmitter (PTT) by means of a potential-free relay contact
Additional functions with the FT634-C/NL:
- Tone signalling: single-tone sequence, 5-tone sequence as per recommendation of ZVEI 1, and DTMF
- Channel switching through a 5-tone sequence
- 4- or 6-bit channel switching output (black box), 6-bit with 19-inch module
- 6 available switching inputs at the 19-inch module (only with special optional software)
- Squelch input with configurable logic
- Can be configured to be used as a line interface to a control panel
- The input impedance of the (rental) line can be adjusted (high-ohmic)
- The software parameters (RS-232 TTL) can be adjusted using an optional RS-232 converter and cable