EB-GS2985-S
Evaluation Board User Guide
52246 - 2
July 2009
11 of 25
1.8 Measuring ORL
To measure Output Return Loss (ORL) on the EB-GS2985-S board, follow the next steps:
1. Disconnect ORL_JP
2. Set the SW2 position marked EQ to LOW “0”. This sets the EQ input of the cable
driver to LOW “0”.
3. The cable driver outputs are now balanced.
ORL can now be measured single-endedly using a Network Analyzer.
Please refer to the GS2988 data sheet for more information regarding balance mode.
1.9 Board & Software Setup Instructions
1.9.1 Installing the Gennum USB Dongle Board Software
Connect the Gennum USB Dongle Board to a Computer.
Insert one end of the USB cable to the computer USB port, and the other end to the
Gennum USB Dongle Board. The microcontroller will come pre-programmed with
firmware.
Install the USB Device Driver (if required):
1. Insert CD.
2. Double-click on the
MCHPFSUSB_Setup.exe
icon on the CD-ROM and proceed
with installation.
3. For Windows XP users, follow instructions below.
Table 1-11: Cable Driver Termination Supply (CD_TERM_SEL)
Position
Connection
Description
CD (default)
Termination voltage supply
tracks Cable Driver supply
EXT
Termination voltage uses
separate power supply
(CD_TERM post)
Table 1-12: ORL Jumper Settings (ORL_JP)
Connection
Description
Normal Operation (Default)
ORL Measurement
