User's Manual

Overview Nexus FT
1-4 044-05251 Rev C
The gain to this connector is +2dB. The +7V input is used for +7V supply from the DIA PCBA and the ATT
connection is for the control signal for a controllable attenuator in the LNA.
Figure 1-4 LNA
Duplex Filter (DPX)
DPXs are located on the metal cover sheet in the upper part of the cabinet.
Fiber Optic Unit (FOU)
The FOU is a metal plate mounted on top of the cover p
late in the uppe
r part of the Nexus FT. The FON and
fiber optic connectors are mounted on the FOU. Figure 1-5 illustrates an FOU with the FON and fiber optic
connectors mounted on the plate. It can also be configured with combiners, splitters, and Wave Division
Multiplexers (WDMs) to obtain a desired combination of several branches with double or single fiber.
Figure 1-5 FOU in Nexus FT
Fiber Optic Node (FON)
The FON is the main part of the FOU. It is a bi-directional electrical/optical signal converter and a node in a fiber
network. In addition, th
e FON has all the functionality included in the CU PCBA and contains battery backup.
It has also functionality for:
• Electrical and optical signal supervisio
n
• Internal and external alarm handling
• RS232 interface for local PC control via an O&M software (OM-Online)
• Remote control via an O&M software (OM-Online or OMS)
• Interfaces for RCU and FLI
• Battery backup with charger
There are two versions of the FON; one with three SMA por
ts (UL, DL
and RX Mon) and the other with four SMA
ports (UL, DL, RX Mon and TX Mon). The FON also has two optical ports for DL and UL fiber connections.
Power Supply Unit (PSU)
The PSU supplies DC power to all of the compon
ents in the Nexus FT.
Remote Control Unit (RCU)
The RCU is an optional communication unit for remote control of Nexu
s FTs via PSTN or RF modems. RCU
types and details are described in Chapter 4.
FON
DPX