User's Manual

User Handbook L-RU Revision C
CONFIDENTIAL
PROPRIETARY
Reg. No.: User Handbook 1100182-C.DOC Page 14 of 29
3.2 Functional Building Blocks of the Remote Unit
A picture of the inner arrangement of the remote unit is shown in Figure 7.
AC Power Cable
SC/APC Optical IN / OUT
Connectors
RF N- Connector
PSU
Monitoring LED
Downlink path
Earthing Clamp
Uplink path
Pilot Tone Monitoring Optical Module Duplexer
Figure 7: Inner arrangement of the Remote Unit
The optical transceiver and the power supply are separate modules. The pilot tone moni-
toring, downlink, uplink and the duplexer are integrated on one PCB. All modules of the
RU are integrated in a cast housing with integrated heat sink designed for wall mounting.
The housing has a protection against splash water, dust and dirt. All connections are ar-
ranged on the bottom side. The attractive design and the protection class IP 54 allows in-
stalling the RU in various environments.
3.2.1 Uplink
The uplink path mainly consists of a four-stage amplifier with two integrated filters, an ALC
and a limiter to protect the laser in UL against high power levels and to avoid non-linear
operation.