Ascent AT5000 User manual

AT5000
External
Modulation
Optical
Transmitter
Quick Reference
Guide
Revision I

AT5000 External Modulation Optical Transmitter
Solutions Provider for FTTx, RFoG and HFC www. ascentcomtec.com
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ACT AT5000 External Modulation Optical Transmitter
Quick Reference Guide
ACT Document Number: ACT AT5000 External Modulation Optical Transmitter
Quick Reference Guide Revision I
Copyright © 2023 Ascent Communication Technology Limited.
All rights reserved. Reproduction in any manner whatsoever without the express written permission of Ascent
Communication Technology is strictly forbidden.
This document is produced to assist professional and properly trained personnel with installation and maintenance
issues for the product. The capabilities, system requirements and/or compatibility with third-party products
described herein are subject to change without notice.
For more information, contact ACT: [e-mail]
Revision History
Revision
Date
Reason for Change
A
01/23/2018
Initial release
B
02/20/2018
Update Sections
C
02/22/2018
Minor updates
D
05/27/2018
Updated specifications
E
09/03/2019
Updated section 2.4
F
04/27/2020
Added section 9
G
09/10/2020
Updated pictures
H
12/08/2022
Updated various sections
I
11/15/2023
Update section 5.1

AT5000 External Modulation Optical Transmitter
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Table of Contents
1Precautions ............................................................................................................................ 5
2Introduction ........................................................................................................................... 6
2.1 Overview························································································································ 6
2.2 Features ························································································································· 6
2.3 Specifications ················································································································· 7
2.4 Models and Options······································································································· 8
3Installation ............................................................................................................................. 9
3.1 Equipment Inventory ····································································································· 9
3.2 Packaging and Transportation ····························································································9
3.3 Power and Cooling Requirements ················································································· 9
3.4 Installation and Adjustment ·························································································10
3.5 Front Panel Operation ··································································································11
3.6 Rear Panel Operation····································································································12
4Technical Description ............................................................................................................13
4.1 Overview·······················································································································13
4.2 Physical Description······································································································13
4.3 ITU Frequency Grid ·······································································································14
5Software Description –Operation ........................................................................................15
5.1 Web Management ········································································································15
6Setup Menu...........................................................................................................................22
7OMI Adjustment....................................................................................................................25
7.1 The Request on RF Input Level ·····················································································25
7.2 AGC Condition···············································································································25
7.3 AGC Operation ··············································································································25
8SBS Adjustment Steps...........................................................................................................25
8.1 SBS Suppression············································································································26
9Optimal Input Signal Level ....................................................................................................27

AT5000 External Modulation Optical Transmitter
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Warning
Exposure to class 1M laser radiation is possible. Access should be restricted to trained
personnel only. Do not view exposed fiber or connector ends when handling optical
equipment.
 Ensure adequate cooling and ventilation as specified.
 The installation and operation manual should be read and understood before units are put into
use.
 Always replace protective caps on optical connectors when not in use.
 The typical connectors fitted are SC/APC 8°. Note: 8°angle polished connectors must beused.
Cleaning
Use only a damp cloth for cleaning the front panel. Use a soft dry cloth to clean the top of the
unit.
Do not use spray cleaner of any kind.
Grounding
The XMOD2 Transmitter should have good grounding with grounding resistance <4 Ω.
According to the international standard, 220V plug in adopts tri-wire rule and the middle wire
is the grounding wire.
Before connecting circuit, please use proper electric wire (#20AWG and more) to connect the
grounding screw and the grounding frame. When use DC input power supply, the equipment
chassis must be grounded.
Overloading
Overloading wall outlets and extension cords can result in a risk of fire or electric shock.
Use approved electrical cords.
Damage requiring service
Unplug unit and refer servicing only to Ascent Communication Technology qualified service
personnel.
Servicing
Do not attempt to service this unit yourself. Refer all servicing only to Ascent Communication
Technology qualified service personnel.

AT5000 External Modulation Optical Transmitter
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AT5000 1RU Dual Output 1550nm Externally-Modulated (XMOD2) Laser Transmitter offers a
flexible, medium and long distance and scalable optical transmission for high quality analog
and digital video in CATV networks.
AT5000 XMOD2 1550nm series transmitters are designed with two optical output ports with
power from 3 dBm, 6 dBm, 9 dBm, and 10 dBm. These transmitters are equipped with field
adjustable Stimulated Brillouin Scattering (SBS) suppression from 13 dBm to 19 dBm. AT5000
XMOD2 series simplifies the application by offering chirp-free operation with confined optical
line width and maintain excellent distortion performance CNR, CSO and CTB across the entire
network.
AT5000 XMOD2 transmitter provides low dispersion transmission with intuitive front panel
LCD display to make operator’s life easier. The optical transmitter is packaged in a self-
contained 19” sub-rack of 1 RU with dual main power supplies and SNMP management.
Together with ACT 1RU EDFA optical amplifiers, the AT5000 XMOD2 provides an ideal long-
distance video and short, medium video overlay solution in high density FTTX networks to
bring the CATV services to business and home premises.
 High performance on CSO, CTB with RF pre-distortion circuit
 Dual optical output power up to 10dBm
 Suitable for long distance 1550 nm DWDM Video transmission applications
 Suitable for short, medium distance FTTH applications
 Low noise DFB continuous wave laser, reduce the dispersion effect
 Optimized models for 60 PAL or 89 PAL channels, 80 NTSC channels or 110 NTSC channels
 Dual redundant hot-swappable AC or DC power supplies
 Field-adjustable Stimulated Brillouin Scattering (SBS) suppression for optimized CSO
 Front-panel LCD for local monitoring of transmitter status
 Local or remote monitoring and configuration
 SNMP/HTTP monitoring, management and control

AT5000 External Modulation Optical Transmitter
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AT5000 XMOD2 1550nm Externally-Modulated (XMOD2) Laser Transmitter - 19” 1RU
Items
Unit
Min. Typ.
Max.
Notes
Optical
Wavelength
nm
1540
1563
Compatible with ITU wavelength
Output Port No.
1 2
Each Output
dBm
5
10
1 dBm/step
Laser linewidth
MHz
0.35
SMSR
dB
45 50
RIN
dB/Hz
-160
20 MHz to 1002 MHz
Optical Return Loss
Fiber Connector
RF
dB
50
SC/APC
FC/APC, LC/APC Optional
Bandwidth
MHz
47
1218
870 MHz / 1002 MHz optional
Input Level
dBμV
75 80
85
AGC
MGC ATT
dBμV
0
15
In MGC
Unflatness
dB
-0.75
+0.75
47 to 1002MHz
Return Loss
dB
16
47 to 1002MHz
Input Impedance
RF Connector
Link
Test Channels
CNR1
Ω
dB
75
F Metric/ Imperial
PAL-D/59CH PAL-D/99CH
≥53.0 52.0
Optional
TX to RX, 0 dBm input to node
CNR2
dB
≥51.0 50.0
65K fiber, 0 dBm input to node
CTB
dB
≥65
CSO
dB
≥65
SBS
dBm
13
19
Adjustable, Step 0.1dB
General
Network Management
SNMP, WEB supported
Power Supply
V
90
265
AC
-72
-36
DC
Power Consumption
W
50
Dual power supply, 1+1back up
Working Temperature
°C
-5
+65
Auto case temp control
Storage Temperature
°C
-40
+85
Working Relative Humidity
Dimensions (W×L×H)
Weight
%
mm
kg
5
450 × 483 × 44
7.4
95
Note: Measured in a typical system configuration for the nominated channel numbers and nominated fibre lengths
for each model at 25 °C ambient temperature.

AT5000 External Modulation Optical Transmitter
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Page 7 of 28
Note
Contact ACT for additional product variations on output power, 1 GHz, specific ITU
channels, optical connectors etc.

AT5000 External Modulation Optical Transmitter
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On receiving your new AT5000-XMOD2, you should carefully unpack and examine the
contents for loss or damage that may have occurred during shipping. Refer to warranty
registration if loss or damage has occurred. The AT5000-XMOD2 should consist of the
following:
Qty Description
1 AT5000-XMOD2 Unit
1 Key for switching laser ON / OFF
1 Power supply cord
1 Optional Product User Manual (includes individual test sheet)
Keep all AT5000-XMOD2 packing boxes and packaging for future transport.
Use only the original AT5000-XMOD2 packaging when transporting. This packaging has been
specifically designed to protect the equipment.
The AT5000-XMOD2 requires a mains input of 90 VAC to 265 VAC at 50 to 60 Hz or 30 VDC to 72
VDC. The unit will automatically adjust the power conversion for inputs within these ranges,
with no switch setting or other user intervention. Power consumption of the unit is 50 watts
maximum.
The transmitter is designed to operate with an ambient temperature of 0 °C to 50 °C with
humidity up to 95 %. Free ambient air should be maintained around all sides of the unit. Care
should be taken to ensure that the air flow around the unit is unrestricted.
The AT5000-XMOD2 should have a minimum ventilation clearance of 1 RU above and below
the transmitter.
Warning
DO NOT expose AT5000-XMOD2 to conditions which would permit condensation to
form on the inside of the transmitter.
DO NOT operate AT5000-XMOD2 outdoors.

AT5000 External Modulation Optical Transmitter
Solutions Provider for FTTx, RFoG and HFC www. ascentcomtec.com
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Warning
Exposure to class 1M laser radiation is possible. Access should be restricted to trained
personnel only. Do not view exposed fiber or connector ends when handling optical
equipment.
The following steps explain how the AT5000-XMOD2 is to be installed.
1. Unpack the transmitter and inspect the unit as stated in Section 3.1.
2. Locate the transmitter in a 19” cabinet ensuring adequate ventilation and space for accessing the
rear ports and front-panel keypad.
3. Before connecting AC power to the unit, make sure that the LASER ON/OFF key is switchedOFF
(front panel).
4. Use the supplied power cord to apply mains power to the transmitter.
5. Switch the AC or DC power ON (switch located on the rear panel).
The ALARM LED will light red.
The LCD will light and display “Model: AT5000-XMOD2” and “KEY OFF” on start up.
6. Switch on the laser using the key switch.
Front panel shows "KEY ON…", Laser status LCD turns green from red, the unit enters self-
checking, after checking it enters working status, display " Descriptor"
Warning
Allow 15 minutes for the transmitter to reach its stable operating temperature. Do
not connect the RF/optical ports to the network or start aligning the system until
then.
7. Before connecting an RF signal, check that the power input level is within the acceptable range.
Refer to Section 2 for details.

AT5000 External Modulation Optical Transmitter
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Page 10 of 28
8. Connect a matrix generator or head-end RF signal.
Note
The default control mode is AGC. The modulation control mode displayed in the
main menu is RF Mode = AGC.
9. Connect a fiber patch-cord from optical port OPT. OUT 1 to an optical power meter and verify the
LCD reading matches your power meter reading.
When the ALARM LED shows green, the transmitter is ready for full operation.
Port
Item
Description
1
Mounting Points
Holes for securing unit to rack
2
LASER ON/OFF
Key switch for laser activation
3
LASER
Laser indicator
GREEN –Output power is normal
RED –Abnormal status
4
RF
RF indicator
GREEN –Normal operation
RED –RF input is too low or too high
5
TEMP
Temperature indicator
GREEN –Temperature is normal
RED –Operating temperature is too low or too high
6, 7
PWR1/PWR2
Power 1 / Power 2 indicators
GREEN –Two-way switch power supply is working
YELLOW –One-way power supply is working
RED –Abnormal status
8
VFD/LED
VFD/LED display for optical transmitter parameters such as
model number and operation status
9, 10
AGC/MGC
AGC/MGC indicator
Displays AGC/MGC working status
11
KEYPAD
Keypad used to scroll through menu items on transmitter display
12
ENT
Enter button
13
RF TEST
Input level test (-20 dBm)