Transmitters 9 November 2001 81
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Tran sm it te r
Each 210-QTX and 810-QTX is tuned to a specific
International Telecommunication Union (ITU) channel
wavelength at 256 QAM. The 810-QTX permits adjustment
of fiber-length setting to meet the requirements of a
particular link.
Front Panel LEDs and test points on the front panel let you monitor a
transmitter’s performance. All Diamond Transport
transmitters come with an optical connector on the front
panel, providing access to both sides of the optical bulkhead.
The 200-TX, 700-TX, and 800C-TX series transmitters use
the AGC/MAN switch to select automatic or manual gain
control mode. The 800E-TX and 800G-TX transmitters offer
an additional setting for customer-set AGC (AGC active with
customer-optimized OMI). In the automatic mode, the
transmitter compensates for minor fluctuations in the RF
signal and maintains a constant RF drive level to the laser. In
the manual mode, you’ll adjust this level with the manual gain
control, also accessible through the front panel; RF drive level
varies with fluctuations in the signal source. The 210-QTX
and 810-QTX series transmitters do not have AGC.
Rear Panel RF, control, and DC signals enter the transmitter through
connectors on the housing’s back panel. TX Series
transmitters offer a second RF input for locally injected RF
signals.
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