td voa 2ch - kt.agh.edu.pllason/01_td/43_td-voa-2ch_b.pdfin no event shall transmode systems ab be...

TM-Series Technical Description 2ch Variable Optical Attenuator (VOA-2CH) Rev B, 2009-11-30

IN COMMERCIAL CONFIDENCE OPTICAL COUPLER UNIT

Date: Doc. number: Rev: Page

© Transmode 2009-11-30 TD-VOA-2CH B 2 (19)

1 General...............................................................................................................3 1.1 In commercial confidence ...............................................................................................3 1.2 Document Revision History.............................................................................................3 2 Functional Description........................................................................................4 2.1 General description.........................................................................................................4 2.2 Applications.....................................................................................................................5 2.3 Restrictions on placement in card cage ..........................................................................7 2.3.1 Line amplifier in a 1U chassis .........................................................................................8 3 Setting up VOA via ENM GUI.............................................................................9 3.1 ENM Frame Overview...................................................................................................10 3.2 Verbose mode...............................................................................................................11 3.3 Equipment Frame .........................................................................................................12 3.4 NE configurations..........................................................................................................13 3.5 VOA-2CH......................................................................................................................14 3.5.1 Equipment view, unit and interface settings ..................................................................14 3.5.2 Inventory tab .................................................................................................................15 3.5.3 VOA interface tab..........................................................................................................16 4 Management.....................................................................................................17 4.1 Board data ....................................................................................................................17 4.2 Alarms...........................................................................................................................17 5 Mechanical Layout ...........................................................................................18 5.1 VOA-2CH......................................................................................................................18 6 Technical data ..................................................................................................19

Transmode Systems AB © 2009 Transmode Systems AB Box 42114 All rights reserved. No part of this document SE-126 14 Stockholm may be reproduced without written Home page: www.transmode.com SWEDEN permission of the copyright holder




1 GENERAL

The specifications and information within this manual are subject to change without further notice. All statements, information and recommendations are believed to be accurate but are presented without warranty of any kind. Users must take full responsibility for their application of any products.

In no event shall Transmode Systems AB be liable for any indirect, special, consequential or incidental damages, including, without limitation, lost profits or loss or damage to data arising from the use or inability to use this manual, even if Transmode or its suppliers have been advised of the possibility of such damages.

1.1 In commercial confidence

The manual is provided in commercial confidence and shall be treated as such.

1.2 Document Revision History

Revision Date Description of changes

A 2009-06-15 1st release B 2009-11-30 Updates in chapter 2.3

- Addition of TM-301 placement (figure) - Addition of CU-less config in TM-101/102





2 FUNCTIONAL DESCRIPTION

2.1 General description

Figure 1: Block diagram of the VOA-2CH

The VOA-2CH contains two identical and independent Variable Optical Attenuators (VOAs). The VOA-2CH does not contain any optical power monitoring.

The VOA-2CH is a half-slot sized semi-active unit.

The VOA-2CH is intended to be used for power attenuation of an optical signal on a line fiber in an amplified DWDM system, replacing or supplementary to fixed attenuators.

When the unit is without electrical power, the unit will go “black”, meaning an attenuation of at least 30dB on both attenuators.

Upon electrical power up, the attenuation is set to max and then adjusted to the previous applied values. These values are collected from the Control Unit.

The lowest attenuation value you can set is 1dB. Therefore, inserting a VOA-2CH will always add 1dB to the total link loss.

Configurations in TM-3000 and TM-301 chassis require a CU-SFP to operate. NE’s with older CU versions will not accept this unit.





2.2 Applications

The following are some examples where the VOA-2CH can be used in an amplified network. Apart from these, the VOA-2CH can be used anywhere in the network where attenuation of a line signal is needed.

At a terminal node, one of the attenuator functions on the VOA-2CH can be used to adjust the incoming power level into the pre amplifier. The values for the different power levels are found in the System Manual Volume B, “Installation & Commissioning Amplified Links”.

The second attenuator function can be used for attenuating the incoming line signal further before the demux unit, or for attenuating the transmitted line signal before the amplifier.

Figure 2: VOA-2CH in terminal nodes

At a line amplifier node, the VOA-2CH can be used to adjust the incoming power level to the amplifiers. The values for the different power levels are found in the System Manual Volume B, “Installation & Commissioning Amplified Links”. By using the VOA-2CH on an amplifier chain, you can make adjustments to the link attenuation on live traffic systems without removing any fiber. This means that you can compensate for changes in the line fiber attenuation over time.

Figure 3: VOA-2CH in line amplifier nodes





At an OADM node, the VOA-2CH can be used to adjust the incoming power levels to the pre amplifiers, analogous to the terminal nodes. The VOA-2CH can also be used to attenuate the expressed traffic.

Figure 4: VOA-2CH in OADM nodes

The VOA-2CH is not part of the OCM-VOA software control loop. Any changes in the attenuation are done manually via the GUI or CLI.





2.3 Restrictions on placement in card cage

The VOA-2CH is a half-slot unit supported in TM-3000 (slots 13-17) and in TM-301 (slot 4, 5 and 6).

Releases R13.0 and earlier requires that the VOA-2CH is placed in a CU environment, i.e. in a TM-3000 or TM-301.

Figure 5: Slot placement for VOA/2P





2.3.1 Line amplifier in a 1U chassis

In release R14.0 and onwards, the VOA-2CH can be placed in the passive slot of a TM-101/-102 together with any of the below listed OA units. The Embedded Node Manager (ENM) in the OA unit will thus manage both the OA function as well as the VOA/2P.

OA10C/FG OA17C OA2-17/17CC OA2-20/20/CC/LG OA2-20/20CC OA20C OA20C/LG

Figure 6: Compact 1U Line Amplifier NE

The 2ch VOA enables remote adjustment of the attenuation between two sites. This can be used to provide optimum working conditions for the EDFA amplifier and also to compensate for change in fiber attenuation due to e.g. a fiber splice. Note that this Line Amplifier NE has no OSC channels. Remote management access must consequently be done via a local DCN connection.





3 SETTING UP VOA VIA ENM GUI After login to the ENM using a web browser, the initial view is the Equipment view. The appearance will differ depending on what chassis that is used. The figure below shows the view that is presented when logging into a TM-3000.

Figure 7: ENM GUI

The window has several clickable objects as well as menu links. A certain configuration window or information object can be reached via menu links or via clickable objects. Some buttons will change color to reflect alarm status (e.g. fan and power buttons). This will be explained in more detail in the sections that follow.





3.1 ENM Frame Overview

There are three main frames through which the node can be managed.

The “left frame” is a static frame that is always seen in the browser. Pressing on the equipment link will bring the user back to the starting point.

The “top frame” is dynamically updated and shows the number of alarms and the highest severity among them.

The biggest frame is the “equipment frame”. This frame is changed according to the choices made on all the three frames.

See the figure below to see a split view of these three frames.

Figure 8: ENM GUI Split View





3.2 Verbose mode The browser can be set in two modes where different depth of information is presented. This setting is done via the “Browser settings” that is shown on the menu to the left.

For normal operation of a NE the browser shall be set in Verbose mode “off”. This will present the most relevant information and settings and provide a more compact display of the different windows.

Figure 9: Verbose Mode

The default setting is “Verbose mode” in “off” mode. To activate verbose mode, click in the tic-box and press “Apply”. Some configurations can only be done with the verbose mode activated. This will vary from unit to unit.

When needed configurations have been done it is recommended to reset the verbose mode to “off”.





3.3 Equipment Frame

The equipment frame seen in the figure below points out interesting information and areas with information on what happens when clicking on them.

Figure 10: Equipment Frame

The “Chassis tab” indicates the chassis type. If several chassis are connected into a single NE entity, the included chassis’ will be found under separate tabs. A Control Unit (CU) is required to connect multiple chassis into one NE. It is thus not possible to combine multiple TM-101 chassis in this way since no CU is used in this configuration.

The “Save configuration status” icon changes color when there are unsaved changes in the configuration.

A warning window will be presented upon logout from the ENM if there are unsaved changes. It is then possible to save, leave unsaved or cancel the logout via this window.

All un-saved configurations will be lost if the node is re-booted. It is possible to log-in again and do the save command. All unsaved configurations and settings will however be lost upon a re-boot of the unit.

For each of the Traffic Units (TU’s) there is an area that can be clicked on to show the active alarms for that unit. To configure a TU there is an empty area that can be clicked on and a board wizard will pop up.





3.4 NE configurations When a node is to be commissioned the first time a number of configuration steps must be taken on both NE and board level. To ease this process a Node and Board Wizard is provided. The wizards present a series of pages where configuration data is entered. Every page has a help text where all parameters are described.

The NE related configuration is done via the “Node Installation Wizard” and is activated via the menu item “Getting started” to the left. The following data is entered:

• DNS and Node Name • IP address • Default Gateway • Date and time (NTP) • SNMP Traps • Passwords • Radius and Tacacs+ settings • Backup upload settings • Backup/Restart settings

The entered values are saved and activated after completion of the wizard when the “finish” button is pressed. The above parameters can also be set “manually” via the corresponding configuration windows.

The board/unit related settings can be done via the “Board Wizard”. The “Board Wizard” will prompt for different parameters depending on the unit type.

For TM-3000 and TM-301 chassis the “Board Wizard” will include all installed units in the card cage.

Some pages have a series of buttons at the bottom.

“Refresh”: Updates all values on the page.

“Apply”: Performed changes are activated (note that the change is not saved)

“Multi Set”: Enables setting of multiple parameters that are related and relevant

“View Table”: All related and relevant data is listed in table format

“Help”: Opens an information window on parameters

For additional information on how to commission on node and network level, see the “Installation & Commissioning” sections within the System Manual.





3.5 VOA-2CH

3.5.1 Equipment view, unit and interface settings When clicking on one of the interfaces on the VOA-2CH unit in the equipment view, the following window is presented.

A number of tabs enable access to information and enter configuration data.





3.5.2 Inventory tab

The Inventory tab provides inventory data.





3.5.3 VOA interface tab

The VOA-2CH unit has two independent VOA-functions. Each of them can be selected via the drop-down menu at “Name Individual settings per VOA function is done by writing the wanted value in dB in the box next to “wanted attenuation” and push the “Apply” button. Same settings on all VOA functions can be done via the button “MultiSet”.





4 MANAGEMENT

4.1 Board data

All boards/units within a TM-3000/-301/-101 Network Element have unit related information stored in non-volatile memory banks. This information is stored at production and is required for administration and start-up of the boards.

The information is divided into three main groups:

• Environmental data - Contains data, which is read and used without knowledge of production data version

• Generic board data - Contains administrative data, which is included on all boards, both active and passive.

Specific board data - Data needed for proper board operation.

4.2 Alarms

The VOA-2CH generates alarms in the following situations:

• When the board is missing.

• When the board is set in maintenance mode.

• Upon a communication failure with the board.

• When vital product data stored in the memory has become corrupt.





5 MECHANICAL LAYOUT

5.1 VOA-2CH

All optical connectors are of MU-type.






6 TECHNICAL DATA

Table 1: Technical data VOA-2CH

Parameter/requirement

Wavelength range 1530 – 1565 nm

Insertion loss 1dB

Attenuation range setting (including insertion loss)

1 – 15dB

Attenuation resolution 0.1dB

Return loss 40dB Attenuation setting accuracy 0-5dB 5-15 dB

±0.3dB ±0.5dB

PMD 0.2 ps

Status at electrical power loss All VOA functions are set to max attenuation (~30dB)

Power consumption, max Typ 0.3 W, Max 1 W

Weight 0.16 kg

Table 2: Revision data

Product number Rev Introduced Release

VOA-2CH R1A 13.0 1st released version.

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