Prisma II 1310 nm High Density Transmitter and Host Module ...

Chapter 1 Module Introduction
In Manual mode, an attenuator can be used to reduce RF power in an overdrive
condition or to compensate for variations in transmitter gain. Any manual
attenuator adjustments are reflected in the indicated RF drive level. It may be
desirable to make such adjustments to compensate for power differences if the
channel load differs from the specified value.
In AGC mode, the microprocessor monitors the actual input composite power
and adjusts the attenuator to maintain constant RF drive level into the laser
diode.
After the RF amplification and control stage, the signal is equalized and impedancematched,
and then is sent to the laser. The optical output connector is located on the
front panel of the module.
The user can turn the laser on or off, adjust the drive level to the laser, and set alarm
levels. The module can be controlled either locally using an ICIM front-panel
interface, or remotely using LCI or TNCS software, CLI commands, or the ICIM Web
Interface.
High Density Transmitter Optical Output
Laser Warning
Depending on how you ordered your system, the optical output connectors may be
either SC/APC, SC/UPC, or E2000/APC.
WARNING:
Avoid damage to your eyes! Do not look into any optical connector while the
system is active. Even if the unit is off, there may still be hazardous optical
levels present.
High Density Transmitter Block Diagram
Broadcast RF
Input
Voltage
Controlled
Attenuator
Predistortion
DFB
Laser
Optical Output
New Media
( narrowcast)
RF Input
ICIM
Front Panel
( optional module)
Front Panel
RF
Test Point
Microprocessor
LCI User
Interface
Connector
( on chassis)
TP202
4 78-4021716-01 Rev C