NSA 400 In Stock

The NSA 400 by Spirent is a specialized device known as an ADSL Noise Impairment Generator. It serves the purpose of introducing various impairments into signals transmitted through one end of a line. This capability allows for the testing of telecommunications transmission systems in compliance with the recommended specifications of European (ETSI), North American (ANSI), and International (ITU-T) standards bodies. Primarily designed for testing Asymmetrical Digital Subscriber Loop (ADSL) transmission products, the versatility of the NSA 400 extends to the testing of other digital transmission products as well.

The NSA 400 is controlled through software that runs on any Windows 95 computer, and it features IEEE 488 and RS-232 interfaces, ensuring convenient integration into larger testing systems. The device incorporates two LEDs that indicate its power and remote status. The POWER LED illuminates in green when the generator is powered on, while the REMOTE LED turns green to confirm the validity of a given command. The rear panel of the NSA 400 houses the AC input module, digital connectors, and analog connectors. Three types of connectors—RJ-45, bantam, and CF—are provided for accessing the differential noise output, all of which are wired in parallel for easy insertion into an actual circuit. Notably, the bantam connector on the generator is a 3-wire balanced connector (ring, tip, sleeve) with a diameter of 0.173".

The NSA 400 offers a longitudinal output that facilitates the driving of an external transformer. Users have the flexibility to introduce externally-generated impairments through the "EXT NOISE IN" BNC connector located on the generator's back panel. It is worth mentioning that this 50 ohm input is not differential; the outside of the BNC connector is grounded. The frequency bandwidth ranges from 50 Hz to 2.0 MHz for all levels up to -30 dBm and from 1 kHz to 2.0 MHz for levels up to -10 dBm. To ensure precision, a 20 dB attenuator is positioned between the input and the differential output. Moreover, the NSA 400 features a relay mechanism that allows for complete disconnection from the output jacks, even while impairments are still being generated internally. This disconnection eliminates any minimal loading effects caused by the impaired card, ensuring accurate testing conditions.