Holland Electronics NE 1101L User Manual
Forward Optical Receiver
CATV OPTICAL RECEIVER
Operation Manual
Operation Manual
Ver. A1
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Forward Optical Receiver
Operation Manual
TABLE OF CONTENTS
TABLE OF CONTENTS ....................................................................................................2
Chapter 1 Introduction......................................... .............................................................3
Chapter 2 Installation................................................... .....................................................8
Chapter 3 Operating Instruction.....................................................................................10
Chapter 4 LCD Display and Operation Procedure.........................................................13
Chapter 5 Status Monitoring and communication interface...........................................17
Chapter 6 Maintenance and Repair ................................................ ...............................20
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Forward Optical Receiver
Operation Manual
Chapter 1 Introduction
Overview
The CATV fiber optic receiver uses a high linear InGaAs PIN diode as light detector, converting the optical
signal from transmitter into RF signals. The RF signals are then distributed to the end users. There are two
front-end opt ical rece ivers in th e units, and s hare the sam e RF signal am plifier, two receiv ers could prov ide
redundancy function in network. The main applications are as follows：
• Head-end broadcasting
• Head-end to head-end program exchange
• Transmission of video and sound through Hybrid Fiber Coaxial (HFC) networks
In order to achieve maximum performance and confidence by the customer, we detail the characteristics,
applications, and operating instructions in the following chapters. We expect to satisfy the needs of the
customer and provide quality service.
Features
19” 1U height standard enclosure, front LCD display
45 ~750/860 MHz bandwidth
Redundancy A/B switch receiver
Automatic Gain Control / Manual Gain Control
Microprocessor control & Monitoring
RS232/RS485 control interface
High performance value
+1dB ~-3dB Range Adjustable Slope
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Forward Optical Receiver
Operation Manual
Product Description
FRx Block Diagram
FRx Function Block Diagram
PD_A
monitor
Rx_A
Rx_B
Front Panel
RF loss
PD_B
monitor
Ch A Loss
RF
Amp
u-controller
LCD
Button Button Button
Attenuator Slope
Slope
CTL
S
RF
Amp
Pilot Tone Detect
AGC
Communication
TP -20dB
RS485
Powe
RF
Output
RF Level
RF MONITOR
Auto Gain Ctrl
Reset
Com Status
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p
A
Forward Optical Receiver
Indicator/Control Description
Power
Ch A Loss
RF Loss RF signal power less than RF power threshold.
Auto Gain Ctrl
Com Status
Button Rest Reset System, Note: it will restart all system.
Button UP Scroll up
Button DN Scroll up
Button ENT Select highl ighted item on LCD display
RF MONITOR
–20dB
Operation Manual
Main power indicator
Green – AC Power On
OFF -- AC Power OFF
Ch A Optical Power
OFF – Optical input power > Channel A optical power low
threshold
RED Flashing – A port Optical input < Ch annel A optical power low
threshold
Displays status of the gain control mode
GREEN – AGC mode
OFF – MGC mode
Displays status of RS485 or RS232 connection
GREEN – Data transmit or received
F-type female connector, Monitoring output port signal, Measured
value is 20 dB below actual value. Accuracy to ±1 dB.
Rear Panel
Dummy
Hole
AC Power In（ON/OFF Switch,
Plug, Fuse）
RS-485 Interface
Dummy FAN Hole
A/B Port Optical Input
Dummy
FAN
Hole
RS485
Interfac
RS-485
AC
Power In
90V~220V 50/60Hz
FUSE 3.15A
ON
OFF
Groundin
g spacer
RF
Output
/B
Port
Optical
OPTICAL
BA
Connector/Control Description
AC power plug and main power switch. Fuse is rated 250V、
3.15A. For inspection or replacement, press down on the fuse
cap and turn to loosen.
Provides connection to an external computer through RS-485 for
monitoring and configuration setup purposes
Dummy: Not used in this type
tical Input connectors are SC/APC type. For connection, use
O
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Forward Optical Receiver
RF Output
Dummy Hole
Operation Manual
same type of connector.
RF signal Output Port; 75Ω F type female connector
Dummy: Not used in this type
RS-485Interface Pin Definition
This RS-485 is full duplex type, so master and slave pin assignment is not the sa me. The connector definition
should be as following.
Master：(PC side)
1、 Receive+
2、 Receive3、 Transmit4、 Transmit+
Slave：(TX side)
1、 Transmit+
2、 Transmit3、 Receive4、 Receive+
Please make sure AC power is off when replacing new fuse.
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