Overview
1–2
Copyright © 2002 Harmonic Inc.
Figure 1-1 shows front and rear panel features of the PWL 4800T transmitter
module.
Figure 1-1. PWL 4800T front and rear panel features
Transmitter performance is optimized by combining state-of-the-art 1310 nm
DFB (distributed feedback) laser technology and patented pre-distortion
linearization circuitry. Harmonic has designed the PWRLink II family for
integration into networks with advanced element management systems; each
transmitter module employs a microprocessor-based communication and
monitoring architecture. Figure 1-2 is a block diagram of the PWL 4800T
transmitter.
The transmitter’s microprocessor continuously monitors and controls all
critical transmitter parameters in order to optimize performance over both
time and temperature changes. The microprocessor-controlled parameters
include:
•
Input signal attenuation pad
•
Laser power, temperature, and bias
•
Electrical circuit temperature and setpoints
Status LED:
Bi-state LED
illuminates green when the
module is functioning properly, or
red during an alarm or power up
Select LED:
Yellow-colored LED
illuminates when the module is
selected through the front panel
display of the HLP 4200WD
RF Pad Adjustment
RF In:
Female
F connector
Optical Out
RF Monitor:
Monitor point for
RF signal at the
transmitter input
PWL49REP
PWL49FRP