ZL75816
Driver Test Access Switch (DTAS)
Overview
The ZL75816 Driver, Test Access Switch (DTAS) multiplexes 16 G.Fast or DSL lines to a single MeLT test channel. The DTAS is comprised of 16 channels of access switches multiplexed to a high voltage driver. The device has integrated secondary protection so no per channel secondary protection device is required. The DTAS is stackable to support 16 to 128 channel systems. Used with the ZL79258 SLAC Processor the two devices forms a complete MeLT Test Head for up to 128 channels. The DTAS also has integrated control circuitry to implement a dual-output switching power supply which generates the required negative 48V and positive 24V batteries from a 12V input. A single supply generates the necessary battery voltages to support 128 channels of MeLT measurements. Microsemi provides a low cost Inverting Boost reference design. The MeLT test algorithms are robust and field proven. Test suites with accuracies are published by Microsemi. Access switch application is gentle and will not cause a CRC error or affect data rate of the G.Fast of xDSL signal. |
Features
- Highly-integrated 16-line multiplexer for Metallic Line Test (MeLT) applications
- High Voltage Driver
- Integrated Protection
- Compliant with ITU K.20 & K.45
- Integrated switching power supply control
- Two configurations optimized for either a low density or high density line count system
- Low Density expandable from 16 to 64 lines
- Optional 8 Channel architecture available
- High Density expandable to 128 lines
- Calibration port
- Architecture provides wetting (sealing) current
- CRC free testing
- 161-ball 12mmx12mm BGA package
Typical Applications
- Metallic Line Test Capability (MeLT) for G.Fast FTTdp
- Metallic Line Test Capability (MeLT) for xDSL DSLAM Line Cards
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