Ascent Communication Technology AT5226 DMOD Series User manual

AT5000
2.6GHz DMOD
Optical
Transmitter
Quick Reference
Guide
Revision D

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ACT AT5226 Direct Modulation Optical Transmitter
Quick Reference Guide
ACT Document Number: ACT AT5226 Direct Modulation Optical Transmitter
Copyright © 2019 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
04/12/2016
Initial release
B
04/04/2017
Updated specifications
C
04/11/2017
Added WEB manager
D
02/17/2019
Updated formatting

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Table of Contents
1 Precautions ............................................................................................................................ 5
2 Introduction ........................................................................................................................... 6
2.1 Overview ························································································································ 6
2.2 Features·························································································································· 7
2.3 Specifications ················································································································· 8
2.4 Models and Options······································································································· 9
3 Installation............................................................................................................................ 10
3.1 Equipment Inventory ··································································································· 10
3.2 Packaging and Transportation······················································································ 10
3.3 Power and Cooling Requirements················································································ 10
3.4 Installation and Adjustment························································································· 11
3.5 Front Panel Operation·································································································· 12
3.6 Rear Panel Operation··································································································· 13
4 Technical Description ........................................................................................................... 13
4.1 Overview ······················································································································ 13
4.2 Physical Description ····································································································· 14
4.3 AGC Operation ············································································································· 14
4.4 ITU Frequency Grid ······································································································ 14
5 Software Description – Operation ....................................................................................... 16

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5.1 Web Management ······································································································· 16
5.2 Device Status Submenu ······························································································· 19
5.3 Device Settings Submenu····························································································· 20
5.4 Alarm Status················································································································· 20
5.5 Alarm Properties·········································································································· 21
5.6 Network Settings:········································································································· 21
5.7 Change Password ········································································································· 22
5.8 Reset Settings··············································································································· 22
6 Setup Menu.......................................................................................................................... 23
7 Troubleshooting ................................................................................................................... 26
7.1 Fiber Optic Maintenance ····························································································· 26
7.2 Troubleshooting Conditions························································································· 26

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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 be
used.
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.
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.
General Reminders and Warnings
Review these reminders and warnings before you inspect and clean your fiber-optic
connections.
Reminders
 Always turn off any laser sources before you inspect fiber connectors, optical
components, or bulkheads.
 Always make sure that the cable is disconnected at both ends and that the card or
pluggable receiver is removed from the chassis.
 Always wear the appropriate safety glasses when required in your area. Be sure that
any laser safety glasses meet federal and state regulations and are matched to the
lasers used within your environment.
 Always inspect the connectors or adapters before you clean.
 Always inspect and clean the connectors before you make a connection.
 Always use the connector housing to plug or unplug a fiber.

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 Always keep a protective cap on unplugged fiber connectors.
 Always store unused protective caps in a resealable container in order to prevent the
possibility of the transfer of dust to the fiber. Locate the containers near the connectors
for easy access.
 Always discard used tissues and swabs properly.
Warnings
 Never use alcohol or wet cleaning without a way to ensure that it does not leave residue
on the endface. It can cause damage to the equipment.
 Never look into a fiber while the system lasers are on.
 Never clean bulkheads or receptacle devices without a way to inspect them.
 Never touch products without being properly grounded.
 Never use unfiltered handheld magnifiers or focusing optics to inspect fiber connectors.
 Never connect a fiber to a fiberscope while the system lasers are on.
 Never touch the end face of the fiber connectors.
 Never twist or pull forcefully on the fiber cable.
 Never reuse any tissue, swab, or cleaning cassette reel.
 Never touch the clean area of a tissue, swab, or cleaning fabric.
 Never touch any portion of a tissue or swab where alcohol was applied.
 Never touch the dispensing tip of an alcohol bottle.
 Never use alcohol around an open flame or spark; alcohol is very flammable.
ACT AT5226 1RU 2.6GHz 1550nm Direct-Modulated (DMOD) Laser Transmitter offers a flexible
and scalable optical transmission for high quality CATV & SAT-IF video in short, medium
distance FTTH networks. It was designed with high linearity and low chirp DFB laser, with
built-in pre-distortion compensation and AGC close loop control for improved performance.
AT5226 DMOD series transmitters are capable of delivering analog and digital video
transmission up to 15km, all Digital loading up to 45km, with intuitive front panel LCD display
to make operator’s daily operation easier. The optical transmitter is packaged in a self-
contained 19” sub-rack of 1 RU with universal mains power supply and SNMP management.
The optical output power level can be ordered at either 6 dBm, 8dBm or 10dBm with single or
dual power supply for redundancy. Combined with ACT AT5200 Multiport EDFA optical
amplifier, AT5226 DMOD transmitter provides the most cost effective solution for short,
medium IPTV, VOD and traditional CATV & SAT-IF services in HFC & FTTX networks.

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 Suitable for short, medium distance FTTH applications with CATV & SAT-IF overlay
 Wide band: 45 to 862MHz & 950 to 2600MHz
 Optimized models for analog and digital signal up to 15km
 High linearity and low chirp DFB laser
 Built-in pre-distortion compensation and AGC closed loop control,
 Dual redundant hot-swappable AC or DC power supplies
 High reliability with laser APC control circuit
 Front-panel LCD for local monitoring of transmitter status
 Local or remote monitoring and configuration
 SNMP/HTTP monitoring, management and control

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AT5226 DMOD 1550 nm 2.6 GHz Direct-Modulated (DMOD) Laser Transmitter - 19” 1RU
Items
Min
Typical
Max
Unit
Remarks
Optical Parameters
Working Wavelength
1540
1550
1563
nm
1300
1310
1320
nm
Optional
Output Power
4
10
mW
1550 nm
8
30
mW
1310 nm
Optical Isolation
30
dB
Optical Return Loss
50
dB
Fiber Connector
FC/APC, SC/APC
Chosen by customer
CATV RF Parameters
Bandwidth
47
862
MHz
Input Range
75
85
dBµV
Flatness
-0.75
+0.75
dB
47 MHz to 862 MHz
C/N
51
dB
Test standard GT/T 184-2002
C/CTB
63
dB
Test standard GT/T 184-2002
C/CSO
58
dB
Test standard GT/T 184-2002
Input Return Loss
16
dB
RF Port
F-
Imperial
Input Impedance
75
Ω
SAT-IF Parameters
Working Bandwidth
5
2600
MHz
Input Range
-25
-5
dBm
Flatness
-1
+1
dB
950 MHz to 2600 MHz
Input Return Loss
10
dB
RF Port
Imperial
Input Impedance
75
Ω
Tuner Feeding Voltage
0/13/18
V
Tuner Feeding Current
300
mA
General Parameters
Power Supply
A: 160VAC - 250 VAC (50 Hz)
B: 48 VDC
V
Power Consumption
30
W
Working Temp
0
50
°C
Max Working Humidity
5
95
%
Storage Temp Range
-40
60
°C
Dimensions
483 × 395 × 44
mm
1U 19”
Net Weight
5
kg

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AT5226 DMOD Series
Description
AT-5226-DMOD-00-06-M-SC-AC
AT5226 DMOD TX 1RU 1550+/-10nm, 6dBm output, 2600MHz, analog
channels up to 10km , SC/APC, Single AC Power
AT-5226-DMOD-00-08-M-SC-AC
AT5226 DMOD TX 1RU 1550+/-10nm, 8dBm output, 2600MHz, analog
channels up to 10km , SC/APC, Single AC Power
AT-5226-DMOD-00-10-M-SC-AC
AT5226 DMOD TX 1RU 1550+/-10nm, 10dBm output, 2600MHz,
analog channels up to 10km , SC/APC, Single AC Power
AT-5226-DMOD-21-08-M-SC-AC
AT5226 DMOD TX 1RU ITU Ch 21, 8dBm output, 2600MHz, analog
channels up to 10km , SC/APC, Single AC Power
AT-5226-DMOD-21-10-M-SC-AC
AT5226 DMOD TX 1RU ITU Ch 21, 10dBm output, 2600MHz, analog
channels up to 10km , SC/APC, Single AC Power
Note
Contact ACT for additional product variations on output power, 1 GHz, specific ITU
channels, optical connectors etc.

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On receiving your new AT5226-DMOD, 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 AT5226-DMOD should consist of the following:
Qty
Description
1
AT5226-DMOD2 Unit
1
1
Key for switching laser ON / OFF
Test Report
1
Power supply cord
1
Optional Product User Manual ( Optional)
Keep all AT5226-DMOD packing boxes and packaging for future transport.
Use only the original AT5226-DMOD packaging when transporting. This packaging has been
specifically designed to protect the equipment.
The AT5226-DMOD requires a mains input of 90 VAC to 265 VAC at 50 to 60 Hz. 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 AT5226-DMOD should have a minimum ventilation clearance of 1 RU above and below
the transmitter.
Warning
DO NOT expose AT5226-DMOD to conditions which would permit condensation to form
on the inside of the transmitter.
DO NOT operate AT5226-DMOD outdoors.

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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 AT5226-DMOD 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 switched OFF
(front panel).
4. Use the supplied power cord to apply mains power to the transmitter.
5. Switch the AC power ON (switch located on the rear panel).
The ALARM LED will light red.
The LCD will light and display “Model: AT5226-DMOD” 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"
Note
Allow 15 minutes for the transmitter to reach its stable operating temperature. Do
not connect the optical ports to the network or start aligning your 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.
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.

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Port
Item
Description
1
Mounting Points
Holes for securing unit to rack3
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
Status
Status indicator
GREEN – Status is normal
RED – Status temperature is too low or too high
6, 7
PWR1/PWR2
(Optional)
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 satellite optical transmitter parameters such
as model number and operation status
9, 10
KEYPAD
Keypad used to scroll through menu items on transmitter display
11
ENT
Enter button
12
RF TEST
Input level test (-20 dBm)

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Port
Item
Description
1
FAN
Intelligent fan, begins to run when the chassis temperature
reaches 32 °C to 35 °C (set by
2
IF/RF IN
IF/RF signal input
3
Power Supply Switch
UP – 12 VDC
MIDDLE – Off
DOWN – 18 VDC
4
CONSOLE
Console for computer network management
5
ETHERNET
Ethernet port, compliant with CNMP standard interface
6, 7
PS2/PS1
Power supply 2 outlet
Note
Product appearance may vary with model options.
RF IN
45MHz~2600MHz
Cooling/Heating
Control
Power Stability
Control
Output
CPU
Display Front Panel
Control Status Alarm Rs232 Rj45
Laser
ATT/AGC
PA PA
AGC
+13V+18V 0V

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The unit is housed in a 19” rack, 1 RU height. Status indicators and control keys are located on
the front panel along with an RF monitor port. The front panel provides an LCD display for
comprehensive status information and user interface. The rear panel contains the optical
interconnects, power, and data interface connectors.
The RF test port on the front panel is -20 dB from the modulating signal level. This is just after
the internal AGC functional block. This signal is constant when the AGC circuit is functioning
normally. Refer to the specification for typical levels. The output impedance of this port is 75
Ω, with an F-type connector.
The rear panel also contains the two optical ports, which are typically SC/APC bulkhead
connectors.
The power interface, is a standard 3-prong line cord, with hot, neutral, and chassis ground.
The metal chassis of the transmitter is tied to ground.
The AT5226-DMOD will be in AGC mode (Automatic Gain Control) when first powered on. To
change it to MGC mode (Manual Gain Control), refer to Section 5.3.
AT5226-DMOD Wavelength Options: The following table contains the ITU frequency plan with
corresponding wavelengths available to the AT5226-DMOD.
Channel
ITU Freq.
(THz)
Avail. ITU
Wavelengths (nm)
Channel
ITU Freq.
(THz)
Avail. ITU
Wavelengths (nm)
Order Code
Order Code
60
196.0
1529.55
40
194.0
1545.32
59
195.9
1530.33
39
193.9
1546.12
58
195.8
1531.12
38
193.8
1546.92
57
195.7
1531.90
37
193.7
1547.72
56
195.6
1532.68
36
193.6
1548.51
55
195.5
1533.47
35
193.5
1549.32
54
195.4
1534.25
34
193.4
1550.12
53
195.3
1535.04
33
193.3
1550.92
52
195.2
1535.82
32
193.2
1551.72
51
195.1
1536.61
31
193.1
1552.52
50
195.0
1537.40
30
193.0
1553.33
49
194.9
1538.19
29
192.9
1554.13
48
194.8
1538.98
28
192.8
1554.94
47
194.7
1539.77
27
192.7
1555.75

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46
194.6
1540.56
26
192.6
1556.55
45
194.5
1541.35
25
192.5
1557.36
44
194.4
1542.14
24
192.4
1558.17
43
194.3
1542.94
23
192.3
1558.98
42
194.2
1543.73
22
192.2
1559.79
41
194.1
1544.53
21
192.1
1560.61

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The user can use web browser to check the working condition and basic parameters of the
amplifier, it supports IE, Chrome, Firefox, Opera and other main web browser. The following
example are based on Opera browser.
1. Find the IP add in the machine, for example 192.168.1.XXX, set the IP add of the PC in the same
range as following:
Step 1: Open local Area Connection setting:
Step 2: Set Properties

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Step 3: Set the PC IP address in the same range with device IP address. For example the device
IP address is 192.168.1.122, pls set PC IP address to 192.168.1.X (X different from 122).

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2. Open web browser, input the IP add and login in. The IP factory setting is 192.168.1.122.
User Name: admin
Password: ascent
3. The web management consist of five submenus. Items guide on the left, click to enter.

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OMI mode: switch AGC/MGC statuses.
OMI Value: -3 dB to +3 dB adjustable, factory setting is 0 dB.
SBS: 13 dB to 19 dB continuously adjust, 0.1 dBm step 0.1 dB.