Page 1
NE1000 CATV Optical Transmitter
Operation Guide
V5.0
Page 2
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
Contents
Introduction...............................................................................................................2
Specifications............................................................................................................3
Product Features ......................................................................................................4
A NE 1000 Front Panel..................................................................................... 5
B NE 1000 Rear Panel .....................................................................................5
Parts List ..........................................................................................................7
Installation Instructions ............................................................................................7
Trouble Shooting......................................................................................................9
1
Page 3
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
INTRODUCTION
The NE1000 is designed to send PAL and NTSC CATV format television
signals down single mode optical fiber. The transmitter converts input CATV
RF signals to output optical signals.
The NE1000 is available with 6,8,10,13,16, or 20 mW output power. The
transmitter offers an interface for status monitoring and provides a pilot tone
to maintain consistent RF power derived from the optical system.
Using a patented predistortion technology and a low noise DFB Laser the
NE1000 provides superb performance for large channel loading found in
CATV head-ends.
2
Page 4
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
SPECIFICATIONS
Wavelength 1310 ± 20 nm
Output power options 4mW (6 dBm), 6mW (8dBm),
8mW (9 dBm), 10mW (10 dBm)
13mW (11dBm), 16mW (12dBm)
20mW (13 dBm)
Connector Type FC/APC; SC/APC
Optical Output
CSO <-61dBc
CTB <-65dBc
Bandwidth 45-750 MHz.
Flatness ± 0.75 dB
Pilot Tone 10.7 MHz.
RF Input
Input Power Range 15-25 dBmV/Channel
Gain Control 10 dB
Input Impedance 75 Ω
Return Loss >16 dB
Connector F type
Status Monitoring
Monitor Port D-Sub 15 pin
Power Requirements
Voltage 90-260 VAC
Frequency 50/60 Hz
Power Consumption 15W
Operating Conditions
Temperature Range 0°C to 50°C
Maximum Humidity 85%
Dimensions 19”W x 1.75”H x 13” D
Weight 4.5 kg
3
Page 5
6
3
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
PRODUCT FEATURES
Rear Panel
Top
5 4
2 17
Side
Bracket
holes
Front Panel
12
11 10
9 8 7
6 5 4
Figure 1. NE1000 CATV Optical Transmitter
HOLLAND
FIBER-OPTIC CATV TRANSMITTER
3 2 1
4
Page 6
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
FRONT PANEL
A diagram of the NE1000 is shown in Figure 1. The NE1000 features are
described below.
1. AC POWER LED - Lights up when the transmitter is receiving AC power.
2. LASER POWER LED - Lights up when the laser is switched on.
3. LASER ON/OFF KEY SWITCH – Turns on/off the power to the laser.
4. POWER LED - Illuminates when the output power of the LASER is outside the
range of maximum or minimum acceptable power.
5. TEMP LED - Lights up when the laser temperature is abnormal.
6. BIAS LED – Illuminates when the biasing current of the LASER is abnormal.
7. HIGH LED - Lights up when the power of the input RF signal is above normal.
8. NORMAL LED - Illuminates when the power of the input RF signal is normal.
9. LOW LED - Lights up when the power of the input RF signal is below normal.
10. MGC (Manual Gain Control) Adjustment – For manually setting the
transmitter gain when the transmitter is in MGC mode.
11. AGC (Automatic Gain Control) Adjustment – For setting the output power of
the transmitter when the transmitter is in AGC mode.
12. RF MONITOR -20dB – 75Ω F-type connector test port for measuring input
signal level at 20 dB ±1.5 dB lower than the actual signal.
REAR PANEL
1. ON/OFF Switch – Used to turn transmitter on or off.
2. POWER JACK – For supplying power to the transmitter.
3. FUSE – A 250V 3.15A fuse to protect the transmitter against short circuit s and
5
Page 7
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
power surges.
4. MONITOR/DATA Port - A 15 Pin D-SUB connector port for monitoring and
controlling the transmitter from a remote status monitoring system. The pin
definitions and functions of the D-SUB connector are shown in Table 1.
5. SELECTION Dip Switches – For setting locally defined functions. See Figure 2
and Table 2 for dip switch functions and settings.
6. RF INPUT – 75Ω F-type port
7. OPTICAL OUTPUT – An FC/APC port for fiber connection. (As an option the
port can be configured for SC/APC.) Do not look into this port when laser is
operating. The laser can cause serious eye damage.
Pin Function
1 Ground
2
Laser temperature monitor. 1V of output voltage is equivalent to 10°C.
3 Laser bias current monitor. 1V of output voltage is equivalent to 10 mA.
4 Laser output power status. 1V of output voltage is equivalent to 10 mW.
5 Average RF signal power status
6 Internal power supply voltage monitor. 1V of pin output voltage is equivalent
to 6 volts of power supply voltage. The normal pin voltage is 2V.
7 Status Monitoring (STM) control signal input. The pin is used when
interconnecting a Status Monitoring System.
8 Laser control input. A TTL high input turns the laser off. A TTL low input turns
the laser off.
9 RF gain mode control. A TTL high input sets the transmitter to AGC mode. A
TTL low input sets the transmitter to the MGC mode.
10~15 Not Used
Table 1. Monitor/Data port connector pin functions
0
1 2 3 4 5 6 7 8
6
Page 8
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
Switch
Function
No.
Figure 2. Dip Switches
1 Selects transmitter gain control mode. The 0 (off) setting selects the MGC
mode. The 1 (on) setting selects the AGC mode.
2 Selects transmitter control. The 0 (off) setting is for local control. The 1
(on) setting is for remote transmitter operation.
3 Turns on/off the sound for the alarms. The 0 (off) setting turns the sound
off. The 1 (on) setting turns the sound on.
4 Turns on/off the transmitter pilot tone output. The 0 (off) setting allows the
10.7 MHz. pilot tone to be output. The 1 (on) setting turns off the pilot tone
output.
5 –8 Not used.
Table 2. Dip Switch Definitions
PARTS LIST
1. 1 NE 1000 CATV Optical Transmitter.
2. 2 LASER Switch Keys
3. 2 Case Holder Brackets
4. 6 M3 Screws
5. 1 AC Power Cord
6. 1 Spare Fuse (250 V / 3.15 A)
INSTALLATION INSTRUCTIONS
1. For 19” rack mounting (optional) - Use the 6 screws to attach the holder brackets
to the sides of the NE1000 case. The brackets should be mounted so that the
bracket tabs with two holes face the front and point out from the sides of the
7
Page 9
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
case.
2. Make sure the front panel LASER ON/OFF Key Switch and the rear panel
ON/OFF switch are at the OFF position.
3. Connect the AC power cord into the power jack on the rear panel of the NE1000.
4. Connect the RF signal into the RF INPUT port.
5. Remove the cover from the rear panel Optical Output port. Connect the optical
fiber to the Optical Output port. (Be sure to properly clean the optical fiber
connector prior to connecting it to the NE1000.)
6. Properly terminate the other end of the optical fiber (such as into an optical
receiver).
7. Plug the power cord into a 110 volt AC power source to power up the NE1000.
8. Set the number 1 dip switch for the intended gain mode (AGC or MGC).
9. Switch the rear panel ON/OFF switch to the ON position. The Front Panel AC
POWER LED will light up.
10. Switch the front panel LASER ON/OFF Key to the LASER ON position. The
LASER ON LED will light up to indicate that the laser is powered up.
11. Inspect the LASER ALARM indicator LEDs. None of the LEDs should be lit. If
any of the LEDs are lit, then turn the laser key back to the off position and
contact Holland Electronics LLC for assistance.
12. Inspect the MODULATION LEVEL LED indicators. The transmitter can operate
either in LOW, NORMAL, or HIGH modulation levels.
(For AGC mode: If there is less than 80 NTSC channels being input into the
NE1000, then the LOW led may light up. The transmitter will operate normally
as long as the power for each input channel is 15 – 25 dBmV. )
13. If needed, adjust the AGC/MGC trimpots to get an adequate output power.
8
Page 10
NE1000 CATV Optical Transmitter Operation and Mainte nance Guide
TROUBLE SHOOTING
Troubles Possible Cause and Solution
The AC Power LED is not lit and
the module does not work.
The fuse located on the rear panel is not intact. To
check this fuse, first power down the NE 1000 and then
remove the fuse from the transmitter. If the fuse is bad
The optical output power is low.
then replace the fuse with a good 250V/3.15A fuse.
After new fuse is installed, then power up the NE 1000.
1. Check to make sure the connector that is connected to
the NE 1000 is the same cut as is specified for the
transmitter. (The standard NE1000 is intended for use
with an APC optical connector.
2. Make sure the fiber connector end surface is clean.
3. Check the power supply AC voltage. This voltage must
not be less than 90 volts.
9
Loading...