127MN024-010
TFLN
Main tasks carried out by
the TFLN module
Downlink (DL):
ÿ RF-to-optical conversion of the input
RF signal
ÿ Optical splitting: input RF signal is split
onto 4 optical outputs
Uplink (UL):
ÿ Optical-to-RF conversion of the 4
input optical signals
ÿ Automatic Gain Control (AGC)
of each converted signal to
compensate optical losses;
ÿ RF combining of the 4 adjusted
signals into a single RF output
RF ports
• 1 DL RF input port
• 1 auxiliary DL RF input port
• 1 UL RF output port
• 1 auxiliary UL RF output port
Note: nominal input levels required at RF ports is +10dBm (please refer to datasheet for
further information), as well as RF outputs may require a power adjustment to fi ll within the BTS
receiving range.
In order to fulfi l these requirements, external UL and DL attenuations may be required (see TBSI
module).
Optical ports
• 4 DL optical output ports (SC/APC)
• 4 UL optical input ports (SC/APC)
4.3. Master Optical TRX, TFLN
DL Optical
Ports
UL Optical
Ports
RF UL
Auxiliary
Port
Figure 4.3.1: The TFLN Master Optical Transceiver
Status and
Alarm LEDs
RF DL
Auxiliary
Port
RF UL
Main Port
RF DL
Main Port
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