Model 458-LM-A1-30 Multi-Standard Local Loop Simulator w/Optional AWGN Generator
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1.0 Introduction
The Model 458-LM-A1-30 Multi-Standard Local Loop Simulator is the ideal solution for ADSL,
ADSL2, ADSL2+, and VDSL2 chip/modem/DSLAM testing out to 24,025 feet in very small
increments. Optional noise modules may be ordered that add in AWGN on the CO and/or CPE
side, depending on the configuration purchased. The ultimate configuration allows for common
or independent noise levels on both sides.
This 30-MHz local loop simulator is plugged into our Model 458-3SLB (3-Slot) or 458-CC-
16/458-CM (16 Slot) chassis where settings are controlled by a convenient keypad located on
the front, RS-232, Ethernet or IEEE-
488(GPIB). The modular design of Telebyte’s products
allows the 458-LM-A1-30 to be combined with other line modules for a wide variety of test
configurations.
The diagram above shows a sample test configuration where independent AWGN
may be added to the near and far end of the loop. Variable noise levels provide uncorrelated,
simultaneous injection where desired.