OTOT-EM55X / OTOT-EM55XL
Optical Transmitter 1550nm
OPERATING MANUAL
24926 Highway 108
Sierra Village, CA 95346
Phone: (800) 545-1022
Fax: (209 586-1022
Rev. 1 E-Mail: sales@olsontech.com
12/02/07
TABLE OF CONTENTS
Safety Instructions....................................................................................................................................................................... 5
Parts List...................................................................................................................................................................................... 6
Ordering Information .................................................................................................................................................................. 6
General Description .................................................................................................................................................................... 6
Introduction ................................................................................................................................................................................. 6
Figure 1 — Model OTOT-EM55X Front View .............................................................................................................. 6
Principle of Operation................................................................................................................................................................. 7
Figure 2 — Transmitter Functional Block Diagram ...................................................................................................... 7
Figure 3 — EMS/NMS Interface.................................................................................................................................... 9
Figure 4 — OTOT-EM55X Interfacing with Other Equipment and a SNMP EMS................................................. 10
Technical Specifications ........................................................................................................................................................... 11
Applications .......................................................................................................................................................................... 11
Features ................................................................................................................................................................................. 11
OTOT-EM55XL Performance.............................................................................................................................................. 11
Test Configurations............................................................................................................................................................... 12
OTOT-EM55X Performance ................................................................................................................................................ 12
Test Configurations............................................................................................................................................................... 13
General Properties ................................................................................................................................................................ 13
Figure 5 — Unit Line Drawing..................................................................................................................................... 14
Displays and Alarms ................................................................................................................................................................. 14
I/O ports of OTOT-EM55X (optional, XL-versions only)....................................................................................................... 15
Figure 6 — Schematic for I/O Ports .............................................................................................................................15
Figure 7 — Schematic for Input-only Ports ................................................................................................................. 15
Figure 8 — Model OTOT-EM55XL Rear Panel Connectors....................................................................................... 16
Figure 9 — 8-Port Mini DIN Connector ...................................................................................................................... 16
I/O port of OTOT-EM55X........................................................................................................................................................ 17
Figure 10 — ...................................................................................................................................................................... 17
Figure 11 — Model OTOT-EM55X Rear Panel Connectors ....................................................................................... 17
Figure 12 — 8-Port Mini DIN Connector .................................................................................................................... 18
EMS / Service Interfaces .......................................................................................................................................................... 18
NMS Server Interface: Ethernet 10/100Mbps (XL) ............................................................................................................ 18
Local Setup interface: RS232 (XL)...................................................................................................................................... 18
Device bus interface: RS485-master (XL)........................................................................................................................... 19
Device bus interface: RS485-slave (X) ................................................................................................................................19
Front Panel ................................................................................................................................................................................ 19
Figure 13 — Model OTOT-EM55X Front Panel Drawing .......................................................................................... 19
Rear Panel ................................................................................................................................................................................. 19
Figure 14 — Model OTOT-EM55X Rear Panel Drawing ........................................................................................... 19
Power Supply and Fan Modules ............................................................................................................................................... 20
100 – 240VAC module........................................................................................................................................................... 20
Figure 15 — 100-240 Volts AC Power Supply Drawing ............................................................................................. 20
±48 VDC module.................................................................................................................................................................... 20
Figure 16 — 48 Volts DC Power Supply Drawing ...................................................................................................... 21
Fan-only Module .................................................................................................................................................................. 21
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Figure 17 — Fan-Only Module Drawing ..................................................................................................................... 21
Operating the OTOT-EM55X ................................................................................................................................................... 21
Power-Up Sequence.............................................................................................................................................................. 21
Setting appropriate operating conditions for the OTOT-EM55XL/XL ................................................................................... 21
Applying an Appropriate RF Input Signal ........................................................................................................................... 21
Figure 18 — Total RMS Input Power for N Unmodulated Channels with 80dBµV .................................................. 22
Figure 19 — BER of Signals ........................................................................................................................................ 23
ITU frequency adjustments in DWDM applications (OTOT-EM55XL only).................................................................... 24
Optical Power On /Off.......................................................................................................................................................... 24
SBS suppression setting (OTOT-EM55XXL only) ............................................................................................................. 24
LED Display.............................................................................................................................................................................. 25
Module Status ....................................................................................................................................................................... 25
INPUT Status........................................................................................................................................................................ 25
OUTPUT Status.................................................................................................................................................................... 25
Push button / LCD interface ..................................................................................................................................................... 26
Security Items ....................................................................................................................................................................... 26
Keys Default Usage .............................................................................................................................................................. 26
Menu Structure ..................................................................................................................................................................... 26
Root-Screen .......................................................................................................................................................................... 26
NMS Server menu(s) (OTOT-EM55XL only)..................................................................................................................... 26
Optical Transmitter Device Menu(s).................................................................................................................................... 27
Controlling the OTOT-EM55X/XL via a NEC ........................................................................................................................ 27
Communicating with the NEC.................................................................................................................................................. 28
Figure 20 — Display of Webbrowser (Microsoft I.E.)................................................................................................. 28
Figure 21 — Log-in to the NEC (=Server)................................................................................................................... 29
Figure 22 — Display of Login Menu ...........................................................................................................................30
Devices Update ......................................................................................................................................................................... 31
Figure 23 — Devices Update Menu ............................................................................................................................. 31
Configure Slots.......................................................................................................................................................................... 32
Figure 24 — Configure Slots Menu ............................................................................................................................. 32
Server Properties .......................................................................................................................................................................33
Figure 25 — Server Properties ..................................................................................................................................... 33
Event Log .................................................................................................................................................................................. 34
Figure 26 — Event Log Page........................................................................................................................................ 34
Trap Statistics............................................................................................................................................................................ 35
Figure 27 — Statistics Page .......................................................................................................................................... 35
General Purpose I/O ports of Server = NEC (optional) ........................................................................................................... 36
Figure 28 — I/O Ports Menu ........................................................................................................................................ 36
Figure 29 — Available Modes of Operation for the I/O Port ...................................................................................... 37
Figure 30 — Available Modes of Operation for the Input-only Ports......................................................................... 38
Examples of I/O port status information ..............................................................................................................................38
Server Administration ............................................................................................................................................................... 40
Figure 31 — Server Administration Menu ................................................................................................................... 40
SNMP Configuration ................................................................................................................................................................ 41
Figure 32 — SNMP Configuration Menu .................................................................................................................... 41
Traps...................................................................................................................................................................................... 41
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Communities......................................................................................................................................................................... 41
Special Settings..................................................................................................................................................................... 42
Trap Verify ............................................................................................................................................................................ 42
Server Update............................................................................................................................................................................ 44
Figure 33 — Server Update Menu................................................................................................................................ 44
Config Save............................................................................................................................................................................... 45
Figure 34 — Config Save Menu................................................................................................................................... 45
Config Restore .......................................................................................................................................................................... 46
Figure 35 — Config Restore Menu .............................................................................................................................. 46
Figure 36 — Config Restore Menu .............................................................................................................................. 47
Status Menu............................................................................................................................................................................... 48
Figure 37 — Status Menu of OTOT-EM55X ............................................................................................................... 48
Parameters Menu....................................................................................................................................................................... 49
Figure 38 — Parameters Menu of OTOT-EM55X....................................................................................................... 49
Internal Voltages........................................................................................................................................................................ 50
Figure 39 — Internal Voltages Menu of OTOT-EM55X ............................................................................................. 50
Settings Menu............................................................................................................................................................................ 51
Figure 40 — Settings Menu of OTOT-EM55X............................................................................................................ 51
Changing the SBS Threshold.................................................................................................................................................... 52
Figure 41 — Changing the SBS Threshold of the OTOT-EM55XL ........................................................................... 52
Changing the OMI
(AGC on modes only) ........................................................................................................................ 53
totrms
Figure 42 — Setting the OMI Total RMS on the OTOT-EM55X ............................................................................... 53
Setting the RF Gain (AGC off mode only) .............................................................................................................................. 54
Figure 43 — Setting the RF Gain on the OTOT-EM55X ............................................................................................54
Changing the ITU frequency of the OTOT-EM55XL.............................................................................................................. 55
Figure 44 — Changing the ITU Frequency of the OTOT-EM55XL ........................................................................... 55
Changing the AGC Mode.......................................................................................................................................................... 56
Figure 45 — Selecting the AGC Mode of the OTOT-EM55X .................................................................................... 56
Changing the Optical Output Power Mode .............................................................................................................................. 57
Figure 46 — Changing the Optical Output Power Mode of the OTOT-EM55X ........................................................57
Changing the I/O Port Mode..................................................................................................................................................... 58
Figure 47 — Setting the I/O Port Mode of the OTOT-EM55X ................................................................................... 58
Setting an Alarm/Warning Mask for I/O Port #0 ..................................................................................................................... 59
Figure 48 — Setting the Alarm/Warning Mask of the OTOT-EM55X........................................................................ 60
Setting the Channel Spacing of the Transmitted CATV Signal ............................................................................................... 61
Figure 49 — Setting the Channel Spacing of the OTOT-EM55X ............................................................................... 61
Setting an Event Mask for the Webserver and SNMP Interface .............................................................................................. 62
Figure 50 — Setting the Event Mask for the Webserver and SNMP Interface of OTOT-EM55X ............................. 62
Figure 51 — Setting the Event Mask for the Webserver and SNMP Interface of OTOT-EM55X ............................. 63
Alarm Flags............................................................................................................................................................................... 63
Warning Flags ........................................................................................................................................................................... 64
Limits Menus ............................................................................................................................................................................ 65
Figure 52 — Limits Menu of OTOT-EM55X .............................................................................................................. 65
Figure 53 — Limits-2 Menu of OTOT-EM55X...........................................................................................................66
Properties Menu ........................................................................................................................................................................ 67
Figure 54 — Properties Menu of OTOT-EM55X ........................................................................................................ 67
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Control of Other Devices with the Ethernet Webserver (HTTP) Interface .............................................................................67
Maintenance .............................................................................................................................................................................. 68
Troubleshooting ........................................................................................................................................................................68
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Safety Instructions
Attention:
Please read the instructions completely and carefully
before installing or operating the unit
!
All operation steps should be carried out in the
prescribed sequence!
Using the equipment improperly can cause serious
danger for persons or damage the devices.
INVISIBLE LASER RADIATION
DO NOT STARE INTO BEAM OR
VIEW DIRECTLY WITH OPTICAL
INSTRUMENTS
CLASS 1M LASER PRODUCT
MAXIMUM OUTPUT POWER:
15.6 mW
WAVELENGTH: 1550nm
IEC 60825-1 (08/2001)
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Parts List
This document contains the description for the following units:
Transmitter Unit
I/O Ports
Power Supply and Fan Module
Optical Interface
Modular, internally modulated 1550nm optical transmitter.
Optional
power supply + fan module 100 VAC ... 240 VAC
power supply + fan module ±36 V
fan-only module
SC-APC optical connector, 8° angle (default)
FC/APC optical connector, JDS-standard (default)
... ±60 VDC
DC
Ordering Information
Base Model Version Freq. Plan Optical Conn. RF Conn. Power Supply
OTOT-EM55 X
OTOT-EM55 XL
N77 = NTSC
PAL84 = PAL
N77 = NTSC
PAL84 = PAL
2 = SC/APC
3 = FC/APC
2 = SC/APC
3 = FC/APC
F = Front of Unit
R = Rear of Unit
F = Front of Unit
R = Rear of Unit
230 = 1x (100-240V
48 = 1x (±36-±72V
230/230 = 2x (100-240V
48/48 = 2x (±36-±72V
230/48 = Mixed 230V
AC
General Description
Introduction
)
AC
)
DC
)
AC
)
DC
/48VDC
The optical transmitter OTOT-EM55X represents a family of externally modulated 1550nm DFB laser transmitters.
These products have been developed to fulfil the requirements of modern Hybrid Fibre Coax networks for the trans-
mission of CATV, cable phone and cable data signals. Two base versions are available
The Model OTOT-EM55X version is intended for applications with a fiber length <50km and features a SBS threshold
of 16.5dBm, a narrow line width laser (0.65MHz), dual +6dBm optical outputs and a RS485 interface for EMS (ele-
ment management systems).
The Model OTOT-EM55XL should be used in applications with a fiber length exceeding 50km. This version offers a
SBS threshold which can be adjusted between 13 and 19dBm, a very narrow line width laser (0.3MHz), dual +6.0dBm
optical outputs, ITU-grid compatible wavelength which can be adjusted by ±100GHz, a 10/100 Ethernet Webserver
and SNMP interface for EMS/NMS (element/network management systems). Network server and transmitter firmware
updates are available for downloading via the Internet, future-proofing the unit.
Both transmitters offer two different standard frequency plans. Specifications for other frequency plans are available
on request.
The optical transmitter comes in a 6ne unit high 19” housing, Figure 1 shows the view of an OTOT-EM55X with RF
in socket, RF-monitor socket and optical connectors on the front panel. Optionally these connectors can be located on
the rear panel.
Figure 1 — Model OTOT-EM55X Front View
A Liquid Crystal Display (LCD) provides information about actual settings and properties. Six push buttons are used
to enter data locally. The background light of the LCD switches on automatically, when a push button is pressed.
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The OTOT-EM55X provides plug in power supply modules. The minimum configuration is one power supply with fan
module together with a redundant fan-only module. Optionally two power supply with fan modules can be used for
improved reliability. The power supply modules can be ordered for 100 ... 240 V
and ±36 ... ±60 VDC. The
AC
OTOT-EM55X accommodates one power supply and Model OTOT-EM55XL accommodates two power supplies,
which can be specified with mixed AC and DC power supplies.
Optical connectors are SC/APC standard with FC/APC optional.
For an EMS (element management system) or a NMS (network management system) an Ethernet 10/100 Mbps inter-
face is available at the rear side of the OTOT-EM55XL. This Ethernet interface supports SNMP and HTTP protocols.
The IP address for the Webserver interface can be set using the push buttons at the front panel or the RS232 local
set-up port at the rear side. An additional RS485 (master) interface has been implemented at the OTOT-EM55XL to
poll other equipment like EDFA’s or optical switches, which are connected to the local RS485 management bus. The
units may be ordered with one general purpose I/O port and four input-only ports for additional alarm or remote func-
tions. These I/O ports are accessible via the Webserver interface.
The OTOT-EM55XL offers two RS485 (slave) interfaces for EMS or NMS. An external level converter from RS485
to RS232 can be offered on request to connect the OTOT-EM55X/XL to standard PC-COM1 or -COM2 interfaces.
Furthermore, there is one alarm output, which can be used for simple alarm messaging functions.
Principle of Operation
The transmitter is based on five functional blocks: RF-path, CW-DFB-laser diode, integrated optical modulator, con-
trol electronics and power supply. The functional diagram is given in Figure 2.
Figure 2 — Transmitter Functional Block Diagram
The RF input signal is fed into a preamplifier comprising an automatic gain control circuitry. The AGC stabilizes the
output signal of the preamplifier to maintain a stable RMS (root-mean-square) optical modulation index (OMI) of the
optical modulator. Input level variations are compensated as long as the AGC circuit is working in its nominal gain
range.
The AGC can be turned off for a constant gain operation via the push buttons, or the Ethernet interface in order to tai-
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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lor the CNR/CSO/CTB performance to the used frequency plan and the requirements of the customer by using a dif-
ferent input level.
Via a high-pass circuit the electrical RF-signal is applied to the input of a predistortion circuit, which is foreseen to lin-
earize the squared sine wave transmission function of the electro optical modulator. The predistortion circuit is re-
quested to minimize 3rd order intermodulations (CTB = composite triple beat). The output signal of the predistortion
circuit is amplified to proper input level for the electro optical modulator, to establish a sufficient modulation depth of
the optical output signal.
The central core of the transmitter is the electro optical modulator working as a Mach-Zehnder-interferometer. The
light from the laser diode is coupled into an optical strip waveguide. An integrated optical splitter divides the light into
two identical portions, which are phase modulated by an RF signal applied to the electrodes of the modulator. The
concept of the electrodes results in a push pull phase modulation of both branches. Following the modulating section
the signals of both arms are combined and interfere. The interference of the phase modulated signals results in an am-
plitude modulation of the output light signal, which is available on both outputs of the combiner.
The necessary CW input light for the modulator is produced by a DFB laser diode working with a wavelength between
1550 and 1560nm. There are two control loops for operating the laser diode at constant optical output power as well as
at constant temperature by means of a thermoelectric cooler. The OTOT-EM55XL has been designed for DWDM ap-
plications and allows tuning the operation frequency (wavelength) by ±100GHz in steps of 50GHz. The laser diode
operating current is monitored in order to detect an increase of the initial value due to ageing of the laser diode. The
increase should not exceed 30%. The temperature of the laser diode is controlled by measuring the required drive cur-
rent for the thermoelectric cooler. At 90% of the available cooler drive current and/or >130% of the initial laser diode
operating current a B-grade alarm is generated which indicates a warning. At 100% cooler drive current the laser diode
operating current is switched off to protect the laser diode against irregular temperature conditions and an A-grade
alarm is generated indicating a severe malfunction. Both types of alarms are causing the corresponding LED on the
front plate of the optical transmitter to emit. In case of a B-grade alarm the yellow LED is lighting since the unit is still
working properly, however close to its limits. In case of an A-grade alarm the red LED is emitting. The messages to
the network management system are of course more detailed. They include the actual values of the currents and tem-
perature as well as alarm flags.
To suppress the Stimulated Brillouin Scattering (SBS) the wavelength spectrum of the optical signal is broadened. Two
technologies are used:
• Broadening the optical spectrum by modulating the laser diode operating current with a microwave signal
• Broadening the optical spectrum by driving an optical phase modulator with a microwave signal
These circuits are mandatory to avoid stimulated Brillouin scattering (SBS) in optical fibres and allow operation with
optical amplifiers feeding at least +13dBm of optical power into standard single mode fibres. For the XL-version of
the transmitter all microwave signals can be adjusted in amplitude via the push-buttons on the front panel to optimize
the SBS and SPM (self phase modulation) performance.
The coupling of light from the laser diode into the modulator is performed by using a polarization maintaining optical
fiber. The optical modulator provides two optical outputs. The signal of one of these outputs is tapped to an InGaAs
photodiode. The electrical signal of this photodiode is evaluated for two reasons:
1) To supervise a proper working of the CW laser diode. In case of optical output power drop of 2dB of nominal power
a B-grade alarm (=warning alarm) is generated, in case of optical output power 0dBm an A-grade alarm (=urgent
alarm) is generated.
2) A detector circuit measures CSO and CTB distortions to optimise the bias point of the electro optical modulator. For
a proper operation of the detection circuit at least two TV carriers with a frequency spacing of 24MHz have to be pre-
sent. Using this standard software setting of the detection scheme all known European and Chinese frequency plans
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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are supported: CENELEC frequency plan, all regular 8MHz spacing frequency plans as well as the German 7/8MHz
frequency plan. Additionally it is possible to change the standard software setting to work with regular 6MHz fre-
quency plans (NTSC) or pure 7MHz frequency plans via push-buttons on the front panel or via the NMS interface.
The OTOT-EM55XL is equipped with 4 data interfaces at the rear side:
• RS232 for a local set-up of the NMS Interface,
• RS485 (master) for polling other Olson Technology equipment like EDFA’s or optical switches and translating
this information to the Ethernet interface (HTTP and SNMP),
• Ethernet 10/100Mb/s supporting SNMP and Webserver (HTTP) protocols for interfacing to a EMS or NMS
• Optionally: General purpose I/O interface
The OTOT-EM55X/XL is equipped with two RS485 (slave) interfaces for interfacing to an EMS or NMS. Additionally,
there are two output ports available for simple alarm or warning messaging.
Plug in power supply/fan modules for different input voltages are available for 100 ... 240 V
, and 36 ... 60 VDC. Each
AC
module can be simply removed during operation without disturbing the operation of the transmitter by removing two
screws.
The interface configuration for Element Management or Network Management systems is shown in the next two fig-
ures for the OTOT-EM55XL with embedded NEC (network element controller = SNMP Proxy Agent) and the
OTOT-EM55X.
Figure 3 — EMS/NMS Interface
The OTOT-EM55XL-versions (ref. to Figure 3, left) contain an embedded network element controller (NEC), which
works as a SNMP Proxy Agent. All equipment (EDFA’s, optical switches, receivers and power supplies) that are con-
nected to the RS485 master interface and support the RS485 protocol are polled. The received data is then translated
into SNMP and HTTP and can be accessed via the Ethernet interface. The NEC is able to poll up to 48 devices on the
RS485 bus. On the optional I/O ports #1 through 5 warnings/alarms collected from all polled devices can be accessed.
The application software of the NEC can be updated easily in order to support new devices. Olson Technology offers
the MIB-files for easy implementation of the SNMP interface into element/network management systems (EMS/NMS)
such as Cablewatch (Olson Technology), HP Open View or Rosa (SA former Barco Networks).
The OTOT-EM55X (ref. to Figure 3, right) does not contain an embedded NEC. The RS485 slave interface of the
OTOT-EM55X can be accessed directly. An element management system which polls this RS485 interface using the
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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protocol can collect data from the transmitter and adjust the transmitter settings. Since the RS485 protocol is quite
complex, this option is only recommended for very advanced software engineers. Details on the protocol are given in a
separate document “Olson Technology device specific messages” which can be obtained from Olson Technology on
request.
The Figure 4 below explains how the OTOT-EM55XL interfaces to other devices and a SNMP EMS.
Figure 4 — OTOT-EM55X Interfacing with Other Equipment and a SNMP EMS
In this figure the OTOT-EM55XL with embedded NEC (upper right corner) is connected to other (Olson Technology)
devices via the RS485 interface. In the example there is an optical amplifier (without embedded NEC) in 19”-1RU
housing, similar to the OTOT-EM55X, and in total four sub racks interfacing to the RS485 bus. A variety of Olson
Technology devices, such as EDFA’s, optical switches, optical transmitters and receivers, can be mounted on these
subracks. All of these connected devices only provide RS485 slave interfaces, since the NEC of the OTOT-EM55XL is
the dedicated RS485 bus master, polling all other devices. The NEC (SNMP Proxy Agent) polls all devices and trans-
lates this information to Ethernet-HTTP and Ethernet-SNMP.
In the example, there is a PC (e.g. notebook) with a HTML Browser (such as Microsoft Internet Explorer, Netscape or
Opera) is connected. If the Browser accesses the IP address of the NEC, which can be set in order to fit to the require-
ments of a LAN, the Webserver within the NEC responds and displays information of all polled devices on the
Browser screen. Using the PC it is possible to get access to data of all devices as well as to change settings of all de-
vices.
Simultaneously, a SNMP EMS (Element Management System) such as Cablewatch from Olson Technology is option-
ally connected to the Ethernet interface. This connection can be realized using a LAN or a WAN between the EMS and
the OTOT-EM55XL. This EMS corresponds with the OTOT-EM55X using SNMP (simply network management pro-
tocol).
The OTOT-EM55XL supports at the same time HTTP and SNMP on the Ethernet interface. The EMS can be imple-
mented to enable a more sophisticated alarm management with alarm filtering, alarm acknowledgement and automatic
messaging through Emails or SMS etc.
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Technical Specifications
Applications
Electrical to optical conversion of multichannel CATV
•
signals like AM-VSB, FM and QAM signals
Enables the usage of optical amplifiers (EDFA’s) as
•
boosters or repeaters in order to realize large scale HFC
networks
• Excellent performance in order to realize links exceeding
100km (XL-Version)
Features
Low noise, narrow linewidth CW-DFB laser
•
•
ITU-Grid wavelength (XL-Version)
Wavelength adjustable ±100 GHz (XL-Version)
•
Electro optical modulator with 2 optical outputs
•
•
Automatic RF gain control: CW, video, manual mode
2 +6dBm optical outputs
•
•
Adjustable SBS threshold up to 19dBm to increase transmission distance (XL-Version)
•
Front panel RF test point -20 dB
•
Dual, hot-plug-in power supply modules for 100-240 VAC, and -48 V
Web and SNMP Interface (XL-Version)
•
•
RS232/RS485 control interface (X Version)
•
Built-in Network Element Controller to poll slave devices like Olson Technology Optical Switches and Olson Technology
Optical Amplifiers via RS485 (a - version only)
LC display and LED status indication
•
•
General purpose I/O interface for remote functions
•
Very thin, only 1RU design for mounting into 19”, ETSI or JIS racks
OTOT- EM55XL Performance
DC
Parameter Units Specification
Optical Properties
Wavelength
Wavelength Adjustment Range
Optical Output Power
SBS-Suppression
Laser Linewidth
Electrical Properties
RF-Frequency Range
Flatness
Version xxx
Channel plan
# of Channels: TV / FM (-4dB) /
QAM64 (-10dB)
Noise Bandwidth
CNR Tx/Rx
CNR Link 1
CNR Link 2
CNR Link 3
CSO Tx/Rx and Link 1
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
ITU-Grid (CH2-CH37)
[GHz] ±100 In Steps of 50
[dBm] 2x +6.0dBm
[dBm] Threshold Adjustable Between +13 and +19dBm
[MHz] 0.3 (typical)
[MHz] 47 – 1000
[dB] <±0.75 (47-860 MHz) <±1.5 (860 MHz-1 GHz)
D84 N77
PAL-D 84 NTSC 77
84 / 0 / 0 77 / 0 / 0
[MHz] 5 4
[dB] 52.5 53.5
[dB] 52.0 53.0
[dB] 50.5 52.0
[dB] 49.0 50.0
[dBc] 65 65
11
Parameter Units Specification
CSO Link 2 [dBc] 65 65
CSO Link 3 at Output #1
CTB
Control Interface
[dBc] 63 65
[dBc] 65 65
RS485/232 Interface
Test Configurations
Tx/Rx
Link 1
Link 2
Link 3
RX with 7 pA/√Hz input noise current density.
EDFA’s with 5dB noise figure.
RF input level at 80dBuV / TV channel.
Booster
EDFA
no no No no 0dBm
no 35km No no 0dBm
16dBm 65km No no 0dBm
13dBm 52km 13dBm 52km 0dBm
st
1
Fiber
Length
In-Line
EDFA
2nd Fiber
Length
Rx
OTOT-EM55X Performance
Parameter
Optical Properties
Wavelength [nm] 1548-1560
Optical Output Power
SBS-Suppression
Laser Linewidth
Electrical Properties
RF-Frequency Range
Flatness [dB] <±0.75
Version xxx
Channel Plan
# of Channels: TV / FM (-4dB) /
QAM64 (-10dB)
Noise Bandwidth
CNR Tx/Rx
CNR Link 1
CNR Link 2
CNR Link 3
CSO Tx/Rx and Link 1 [dBc] 65 65
CSO Link 2
CSO Link 3 at Output #1
CTB
Control Interface
Units
[dBm] 2 x +6.0
[dBm] Fixed threshold +16.5dBm
[MHz] 0.65 (typical)
[MHz] 47–862
D84 N77
PAL-D 84 NTSC 77
84 / 0 / 0 77 / 0 / 0
[MHz] 5 4
[dB] 52.5 53.5
[dB] 51.5 52.5
[dB] 49.0 51.0
[dB] 46.5 48.5
[dBc] 65 65
[dBc] 63 65
[dBc] 65 65
Ethernet 10/100 Interface
Specification
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Test Configurations
Tx/Rx
Link 1
Link 2
Link 3
RX with 7 pA/√Hz input noise current density.
EDFA’s with 5dB noise figure.
RF input level at 80dBuV / TV channel.
General Properties
Parameter Units Specifications
Side Mode Suppression
Relative Intensity Noise
(Opt. Return Loss < -40 dB)
Optical Connector
Optical Fiber
Nom. Input level per TV channel
RF Monitor Output Level
Dynamic Range of AGC
RF-Connector/ Impedance
Return Loss
Climatic Specification
Operation
Storage
EMI
Power Supply
Dual redundant, hot pluggable
Power Consumption
Enclosure
Weight
Weight
[dB] >30
[dBc/Hz]
[dBµV] 80
[dB] -20 dB ( +0.2 to -0.8 dB @ 862 MHz, -1.3 dB @ 1 GHz)
[dB] +3 to –6
[dB] > 20 (47 MHz) – 1,5 dB/oct., min. > 15
[W] <=60
[kg] 9.7
[lbs] 21.4
Booster
EDFA
1st Fiber
Length
In-Line
EDFA
2nd Fiber
Length
Rx
no no no no 0dBm
no 35km no no 0dBm
16dBm 65km no no 0dBm
13dBm 52km 13dBm 52km 0dBm
<-158,
typ. <–160
SC/APC (standard), FC/APC (optional)
Standard Single Mode 9/125 µm
IEC 169-2/75Ω or F-female, 75Ω, front or rear side mounted
ETS 300 019, class 3.1
ETS 300 019, class 1.2
EN50083-2 (April 1996)
EN50083-2 /A1 (February 1998)
100...240 V
36...72 V
DC
AC
19” / 1 RU (optionally compatible to ETSI or JIS standards)
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Figure 5 — Unit Line Drawing
Displays and Alarms
The tables below show the conditions that trigger the LED’s on the front panel. The “Modul” LED summarizes the
condition of the transmitter. The “IN” and “Out” LED’s provide detailed information of the input and output status of
the transmitter.
Standard Operation LED green
Modul LED
Non-Urgent Alarm (warning) LED yellow
Urgent Alarm LED red
Nominal Input Power LED green
IN LED
Input Power Out of Nominal Operation LED yellow
Loss of Input Power LED red
Nominal Output Power LED green
OUT LED
Lack of Output Power LED yellow
Loss of Output Power LED red
Standby – Operation LED dark
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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I/O ports of OTOT-EM55X (optional, XL-versions only)
The OTOT-EM55XL from hardware release 2.0 is optionally equipped with two (2) general purpose I/O and four (4)
input-only binary mode ports. The ports can be configured via the Webserver (HTTP) interface. The schematics of
these ports are given below.
Figure 6 — Schematic for I/O Ports
Figure 7 — Schematic for Input-only Ports
Notes:
• The maximum voltage applied to all ports should be not below GND level and should not exceed +5V
DC
.
• The input level for input high should be >3V; the input level for input low has to be < 1V for NEC hardware re-
lease 2.0.
• The input level for input high should be >1.6V; the input level for input low has to be < 0.8V NEC for hardware
release 2.1.
• The input-only port and the open drain output port have a pull-up resistor of about 100kOhms towards 3.3V.
• The active low output resistance to GND of the output port is < 210Ohms.
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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The OTOT-EM55XL uses an 8 pin Mini-DIN connector for external Input/Output handling. The connector is located
on the backside of the device near to the NMS RS485 Master connector.
Figure 8 — Model OTOT-EM55XL Rear Panel Connectors
Figure 9 shows the view on the 8 port mini-DIN connector.
Figure 9 — 8-Port Mini DIN Connector
The mini-DIN connector pins are used as described in the following table.
Pin Number
Function in TOT-EM55X
of mini-DIN
Comments
connector
GND
+5.1VDC (+/- 5%)
(voltage under no-load condition)
Input / Output No. 0
(from hardware release 2.0 and
software release 2.0)
Input / Output No.1
Input only No.2
Input only No.3
Input only No.4
Input only No.5
2
1
5
7
3
8
4
6
Ground
Max. 80mA, protected by a serial
PTC (< 50Ohms) in NEC hardware release 2.1
Fuse (< 6Ohms) from NEC hardware release 2.2
Used for redundancy switching feature (input port) or as alarm output
port.
Either Input or Output, configurable by Software;
Input mode configurable by Software
Input mode configurable by Software
Input mode configurable by Software
Input mode configurable by Software
Notes:
• On pin 1, there is a 5.1V
(±5 %) supply voltage available for feeding an external interface box, which could
DC
contain optocouplers or relays, external sensors etc.; the current sinked from this port should not exceed 80mA.
• I/O #0 is directly related to the transmitter. If the port is used as an output, alarms related to the transmitter can
be accessed on this output. If the port is used as an input it enables easy redundancy switching between two redundant OTOT-EM55XL.
• I/O #1 to 5 are directly related to the NEC. The output port I/O No. 1, can therefore be used to display a warning
or an alarm, if (1). one of the (up to 50) RS485-polled devices or (2) the OTOT-EM55X or (3) at least one of the
input ports (I/O #2-5), which has been set to indicate a warning or an alarm, exhibits a warning or an alarm.
• All I/O ports can be addressed and configured via the Ethernet Webserver (HTML) interface or via SNMP.
• In order to not degrade the EMI performance of the OTOT-EM55XL, a shielded cable with the shield connected
to pin 2 (GND) of the mini-DIN–connector has to be used.
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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I/O port of OTOT-EM55X
The OTOT-EM55X from hardware release 2.0 is equipped with one I/O port. The figure below shows the schematic of
this port.
Figure 10 —
Notes:
• The maximum voltage applied to this port should be not below GND level and should not exceed +5V
DC
.
• The input level for input high should be >3V; the input level for input low has to be < 1V for NEC hardware re-
lease 2.0.
• The input level for input high should be >1.6V; the input level for input low has to be < 0.8V for NEC hardware
release 2.1.
• The input-only port and the open drain output port have a pull-up resistor of about 100kOhms towards 3.3V.
• The active low output resistance to GND of the output port is < 210Ohms.
The OTOT-EM55X uses an 8 pin Mini-DIN connector for external Input/Output handling. The connector is located on
the backside of the device near to the NMS RS485 Master connector.
Figure 11 — Model OTOT-EM55X Rear Panel Connectors
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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Figure 12 shows the view on the 8 port mini-DIN connector
Figure 12 — 8-Port Mini DIN Connector
The mini-DIN connector pins are used as described in the following table.
Pin Number
Function in OTOT-EM55X
of mini-DIN
Comments
connector
GND
+5.1VDC (±5%)
(voltage under no-load condition)
Input / Output No. 0
(from hardware release 2.0 and software
release 2.0 or later).
Input / Output No. 1
Input only No. 2
Input only No. 3
Input only No. 4
Input only No. 5
2
1
5
7
3
8
4
6
Ground
Max. 80mA, protected by a serial
PTC (< 50Ohms) in NEC hardware release 2.1
Fuse (< 6Ohms) from NEC hardware release 2.2
Used for redundancy switching feature (input port) or as alarm output port.
N/A
N/A
N/A
N/A
N/A
Notes:
• On pin 1, there is a 5.1V
supply voltage available for feeding an external interface box, which could contain
DC
optocouplers or relays etc.; the current sinked from this port should not exceed 80mA.
• In order to not degrade the EMI performance of the OTOT-EM55X, a shielded cable with the shield connected
to pin 2, (GND) of the mini-DIN–connector has to be used.
• I/O #0 is directly related to the transmitter. If the port is used as an output, alarms related to the transmitter can
be accessed on this output. If the port is used as an input it enables easy redundancy switching between two redundant OTOT-EM55X.
EMS / Service Interfaces
NMS Server Interface: Ethernet 10/100Mbps (XL)
The NMS server interface is the main NMS interface of the optical transmitter. It supports HTTP and SNMP protocols.
The NMS server firmware can be downloaded for future software upgrades via the RS232 interface.
Local Setup interface: RS232 (XL)
Connector
Configurations
Interface
Pinning
The local setup interface can be used to locally setup the NMS server’s parameter, like IP parameters and passwords
by using the tool "NmsSetup.exe". It is also used to download software for the NMS server firmware in case the NMS
server crashes during software updates when reprogramming application flash software over Ethernet.
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
Sub-D9 male
115,200 baud, 8 data, 1 stop, no parity
RS232
Pin 1, 4, 6, 9: n.c.
Pin 2: RxD
Pin 3: TxD
Pin 7: RTS
Pin 8: CTS
Pin 5: Gnd
18
Note: The local setup process can only be executed when the device starts up. After startup this interface has no func-
tion yet, but in the future will be used for modem connections.
Device bus interface: RS485-master (XL)
The RS485 interface can be used to connect more devices to be managed by the Ethernet NMS server interface in-
stalled in the optical transmitter. The OTOT-EM55XL in this case works as a network element controller
(RS485-master), which polls all equipment that is connected to the RS485 port.
Device bus interface: RS485-slave (X)
The RS485-slave interfaces can be used to manage the OTOT-EM55X, which reads data and changes the settings. Ad-
ditionally, on a SUB-D9 male connector beside the RJ-45 a RS485 to RS232 level converter is included. Using this
port, software on any WINDOWS based PC can communicate with the OTOT-EM55X by using the COM1 or COM2
ports.
Front Panel
Figure 13 shows an example of the front panel view of the OTOT-EM55X. The RF-input and the optical connectors
are optionally available on the rear panel. The handles can be omitted on request.
Figure 13 — Model OTOT-EM55X Front Panel Drawing
Item # Function
1
2
RF-input (optionally available on rear side)
RF-monitor output
3 Status LED’s
4
5
Liquid Crystal Display
Push button field for local set-up of transmitter
6, 7 Optical connectors (optionally available on rear side)
Rear Panel
The rear panel provides several field replaceable units.
Figure 14 — Model OTOT-EM55X Rear Panel Drawing
Item # Function
1 RF-input (optional located on front panel)
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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2, 3
10, 11
optical fibre outputs (optional located on front panel)
4
Not used in OTOT-EM55X, cover
5
I/O ports
6
RS485 interface (RJ-45 female): a-versions: master; b-versions: slave
7
RS232 interface (SUB-D9 male)
8
a-versions: Ethernet interface; b-versions: RS485 slave interface (RJ-45 female)
9
2 green LED’s Ethernet link & data (a-versions only)
power supply + fan modules (field replaceable)
Power Supply and Fan Modules
There are two different types of power supply and fan modules available for the OTOT-EM55X and OTOT-EM55XL.
All of them can be either mounted on the left hand or right hand side. It is possible to replace or exchange all of the
modules during operation. This offers a big flexibility to the end user in order to customise the OTOT-EM55X/XL ex-
actly to the actual needs.
The necessary outlets for the power supply modules have to be directly located in the rear of the device and have to be
easily accessible.
100 – 240V
Figure 15 provides a view on the 100 – 240V
module
AC
power supply and fan module. The module includes an AC main input.
AC
One LED indicates the status of the power supply module. The power unit O.K. LED lights green when the power
supply module is working properly. The power supply and fan modules can be exchanged during operation (hot
plug-in technology) without harming the equipment or having any impact on the operation of the transmitter in case of
a properly working backup power supply.
Figure 15 — 100-240 Volts AC Power Supply Drawing
±48 VDC module
Figure 16 shows the ±48V
power supply and fan module. The module includes a ±48VDC cable terminal in order to
DC
connect the supply voltage. It is important to take care of the right polarity of the DC supply voltage, either 0 or
+48V
connected to the – and + terminals, respectively or 0 and –48VDC connected to the + and – terminals, respec-
DC
tively.
A fuse and a spare fuse are implemented inside the power supply and fan module and can be replaced if required. One
LED gives the status of the power supply module. The power unit O.K. LED lights green indicating that the power
supply module is working properly. The power supply and fan modules can be exchanged during operation (hot
plug-in technology) without harming the equipment or having any impact on the operation of the transmitter in case of
a properly working backup power supply.
OTOT-EM55X/XL Optical Transmitter Rev. x1 www.olsontech.com
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