User's Manual

Chapter 5: GlobeSpan Control Panel Application
22 GlobeSpan, Inc. Proprietary – Use Pursuant to NDA
6. Select the “ Test” tab of the Control Panel to initiate a Spectrum Test. Four tests are
supported: Spectrum Reverb, Spectrum Medley, Spectrum Pilot and Spectrum R-MTPR.
Select the test from the drop down menu; click Start to initiate the test and Stop to end it.
Spectrum Reverb Test
The Spectrum Reverb Test induces an R-REVERB signal to be continually sent by the
CP. During startup (termed “ initialization” in T1.413), R-REVERB signals are used to
allow the ATU-C receiver to measure the upstream wideband power in order to adjust
the ATU-C transmit power level, adjust its receiver gain control, and synchronize its
receiver and train its equalizer. Refer to T1.413 i2 sections 9.4.6 and 9.5.2 for details
regarding C-REVERB1 and R- REVERB1.
Spectrum Medley Test
The Spectrum Medley Test induces an R-MEDLEY signal to be continually sent by the
CP. R-MEDLEY is a wideband pseudo-random signal used at the ATU-C for training its
frequency-domain equalizer and for estimation of the upstream SNR. Refer to T1.413 i2
sections 9.6.6 and 9.7.8 for details regarding C-MEDLEY and R-MEDLEY.
Spectrum Pilot Test
The Spectrum Pilot Test induces an R-PILOT signal to be continually sent by the CP. R-
PILOT is a single frequency sinusoid used for synchronization of the ATU-C and ATU-R.
Refer to T1.413 i2 sections 9.4.3 and 9.5.4 for details regarding C-PILOT1 and R-
PILOT1.