Factory-Optimized Settings; Returning To Factory Settings - Harmonic PWRLink II 4100S Series Product Manual

Transmitter Setup
4.1

Factory-Optimized Settings

The Harmonic factory optimizes the performance of each model in the
PWL 4100S series prior to shipment. The factory setup is listed in Table 4-1.
Table 4-1: Factory Setup
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RF input level
Link loss
Harmonic
receiver
The Harmonic factory-optimized setup procedure balances:
• CNR (carrier-to-noise) performance
• CSO (composite second order) distortion performance
• CTB (composite triple beat) distortion performance
Once the Harmonic factory optimizes a PWL 4100S transmitter, the factory
settings are written into the transmitter's memory. These settings allow the
transmitter to achieve the performance given in Appendix A at factory setup
for any model in the PWL 4100S series of transmitters.
These factory settings include:
• Internal RF pad value
• Laser bias
• Laser current
• Laser temperature
• Others
4.1.1

Returning to Factory Settings

If at any time the transmitter's settings are changed, you can always return
the transmitter to the original factory settings through the HLP 4200WD
display interface. In the Transmitter Adjustments menu, select the Return to
Factory Settings option. Follow the procedure in Section 4.4.3 Resetting the
Transmitter to Factory Defaults.
When the transmitter reverts to the factory-optimized settings:
• If the transmitter is in AGC mode, the internal RF pad level automatically
adjusts to get the adequate drive level to the laser for optimized
performance.
• If the transmitter is in MGC mode, the transmitter reverts to factory
settings based on Table 4-1, regardless of the actual RF input level. For the
best performance, you must adjust the input level to 15 dBmV per
channel. For instructions, see Section 4.4.2 Fine-Tuning the Transmitter on
page 4-8.
4–2
80 unmodulated System M (NTSC) channels from 45 to 550 MHz;
450 MHz digital information above 550 MHz -6 dBc down from
analog channels
+15 dBmV per video channel
100% fiber link (example: PWL 4115S is tested over 15 dB of fiber)
HRM 3811
(user adjustable)
(not user adjustable)
(not user adjustable)
(not user adjustable)
Copyright © 2006 Harmonic Inc.