VERSIV review questions and answers
Contents
Module VERSIVCU
Review #1
What does the Reset Series feature do?
It sets the Series Counter on the adapter back to zero
Can you disable the calibration date in LinkWare PC?
No, but you can disable it being printed
How often should your Versiv mainframe be calibrated?
Never, only the modules are calibrated
What is the default power down time of the Versiv Smart Remote?
60 minutes
How do you change the power down time of the Versiv Smart Remote?
You cannot
What setting has the most impact on your battery life?
Display brightness
Review #2
Why is a Channel test typically not done by installers?
The patch cords are not available and must be left in place after each test
Which test limit do I use for Category 7A?
There is no such thing as a Category 7A link, so you would use Class Fa
What causes the message “Bad Patch Cord”?
When the RJ45 plug inserted into the Channel adapter creates too much NEXT
What are the three link definitions found in the DSX?
Permanent Link, Channel and Modified Single Connector Permanent Link
What does the (+All) limit add to the test?
Resistance Unbalance within a pair and between pairs, TCL, ELTCTL, CMRL, CDNEXT
Review #3
How many projects can you have?
100
How may Cable IDs per project can you have?
5000
NVP affects what test parameters?
Length
Why should you store plot data?
Needed for alien xtalk, troubleshooting remotely, able to re-certify results if needed
How do you test a two pair link to Category 5e / Class D?
Create a custom outlet configuration or use TIA-1005 limits
Which two test parameters are disabled with AC Wire Map?
Resistance and shield test
Review #4
How often should you set a reference?
Every day or at the beginning of each test cycle
Resistance may show an "i", what should you do?
Nothing as it is not a required test parameter by the standard you've selected
What is the 3 dB rule?
If the Insertion Loss is less than 3 dB, the Return Loss is ignored
The DSX CableAnalyzer reported PASS*, is this acceptable?
Depends on the contract or cabling vendor offering the warranty
What sort of test limit must you choose to run TCL and ELTCTL?
The limit name must have (+All) in the title
If TCL or ELTCTL fails, what is the likely cause?
Cable
Review #5
What is HDTDX used for?
Troubleshooting NEXT issues
What is HDTDR used for?
Troubleshooting Return Loss issues
What is the ideal limit for an HDTDX event at a connection?
35% or 30% on links less than 15 m
What is the ideal limit for a series of HDTDX events in the cable?
10% with no more than four events
What is the ideal limit for a series of HDTDR events in the cable?
|0.8|% with no more than four events
Review #6
Give two reasons why you cannot use Channel Adapters to certify patch cords
RJ45 is excluded from the measurement
Channel test limit is based on four connections – relaxed compare to cord limits
How is the DSX patch cord testing different to the DTX patch cord testing?
Measures NEXT and Return Loss in both directions
What categories can patch cords be certified to using the DSX-PC6?
Category 6/Class E
What is the typical life of a patch cord adapter?
55 thousand connections
Review #7
Is alien xtalk required?
Depends on your contract
What are the two alien xtalk measurements?
PS ANEXT and PS AACR-F
What is disturber ranking?
Allows you to see which links are generating the alien xtalk
What would be the correct sample size for a 960 link installation?
33
According to IEC, under what conditions can I stop testing alien xtalk?
When the margins exceed 5 dB for three short, medium and long links
Module VERSIVFO
Review #8
Why should you never look into a fiber?
It can damage your eyes, there is nothing to see at 850 nm or higher
What’s the difference between OM2 and OM3 fiber?
Modal bandwidth changes from 500 MHz.km to 2000 MHz.km
What is the maximum length you can run 10GBASE-SR to?
400 m per IEEE, ANSI/TIA and ISO/IEC
Why is it important to know which OM fiber you are testing?
Affects what supported applications appear at the bottom of your LinkWare report
What does having a EF compliant launch do for you?
Reduces your measurement uncertainty from 60% to 10% between multimode sources
Review #9
What are the four test types the CertiFiber Pro can do?
Smart Remote, Loopback, Far End Source, Fiber Inspection
Is bi-directional testing required?
Depends on your contract
Why is the 2 jumper reference method not used in certification?
Cabling vendors will not allow it and you may end up with negative loss results
Selecting LC or SC as a connector type does what?
Enables auto continue after swapping fibers for bi-directional testing
Give one limitation of the Click fiber cleaning pens?
Not very good at cleaning dried on dirt/grease
How many fiber end face inspection limits are there in Versiv?
Four
Review #10
What is the maximum TRC check verification value for multimode?
0.15 dB
What is the maximum TRC check verification value for singlemode?
0.25 dB
How does the CertiFiber Pro measure length?
Round trip propagation delay using two fibers
Name the two types of custom test limits you can create
Length based and fixed
If the loss at 1550 nm is higher than that at 1310 nm, what does it suggest?
There is a bend or crack in the fiber
What happens if the loss is reported as -0.12 dB?
You get a warning and the CertiFiber Pro fails the test
Module VERSIVOTDR
Review #11
What can happen if there is a mismatch in backscatter?
The event loss could be optimistic (negative loss) or pessimistic
What is a reflective event?
An event where there is a change in refractive index (typically a connector)
What is a non reflective event?
Typically a splice but could be an Angled Physical Contact (APC) connection
What is a ghost and how is it caused?
It is a false event caused by a connection with a severe reflectance issue
What is the benefit of bi-directional averaging?
To accurately measure the insertion loss of individual connector interfaces or other events in the cabling
Review #12
When would your consider using Manual OTDR?
To document splices less than 0.10 dB
If your contract calls out specific pulse widths
What does pulse width affect?
The ability to see closely spaced events
The length of fiber you can test
What is the default event loss threshold on the OptiFiber Pro?
0.10 dB
Reducing the loss threshold will also require what to be changed?
The averaging time will need to be increased
Review #13
How do you ensure your launch fibers are good?
Set a launch plus tail compensation and look at the trace
Is this Port Connection Quality acceptable (see picture)?
No, it should always be in the green zone
Why is it good to set a reflectance limit?
Prevents links passing with ghosts in them due to poor reflectance
When would you want to set a segment attenuation limit?
When testing a spool of fiber
What does SmartLoop provide?
Bi-directional averaged OTDR result on two fibers, on the tester
