Re: [time-nuts] purpose of time of day display units

[John Clark]

Hello Ruslan,

Thanks for posting the picture and prompting the discussion.

We're the OEM of the amber and blue 1RU displays shown at the top of the racks 
and I can confirm that those are time-code driven displays.

The displays can be used as a confirmation of valid code for distribution - we 
can set the displays to show dashes upon a loss of valid reference and this 
gives an easy, quick indication to an operator that their TC isn't being 
distributed properly.

They've also got the displays set up to show local time/date while the red 1RU 
display to the left is showing UTC.  Many installations will have multiple 
flavors of time code being distributed and they may want an easy reference as 
to which is UTC vs. others and the displays are a good visual confirmation for 
them.

Additionally, all of our displays can also be used as countdown/up systems as 
well whether through software integration or using our count controllers and 
many operators utilize the count function within their applications in addition 
to the time and date.

My best,

John Clark
Masterclock, Inc.

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Ruslan 
Nabioullin
Sent: Sunday, January 22, 2017 12:31 AM
To: time-nuts@febo.com
Subject: [time-nuts] purpose of time of day display units

Hi, looking at pictures of various time metrology equipment setups for best 
practices and inspiration, I have commonly seen time of day display
unit(s) installed in racks containing processing or time transfer equipment, 
e.g., http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.jpg. 
All that these units do is merely display the time of day and sometimes the 
date, typically by means of seven segment LED displays, of the time code 
inputted to them (typically IRIG-B, I'm guessing).  Any ideas why such a unit 
is necessary when one can simply look at the time displayed by timing receivers 
and time code generators (and even some standards), and the interface of some 
fusor, defined in this context as a system which performs timing data fusion 
(by implementing a paper clock or a more primitive algorithm) and timekeeping, 
either by means of a direct shell, or via something like NTP?

Thanks in advance,
Ruslan
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Re: [time-nuts] purpose of time of day display units

[George Atkinson]

They also help weigh the rack down :-)
I took this photo before I saw the thread.

Robert G8RPi.


> On 23 January 2017 at 12:14 Bob Camp <kb...@n1k.org> wrote:
> 
> 
> Hi
> 
> Trying to troubleshoot those racks *without* being able to see the timing is
> harder than if you can. This gizmo should trigger at the top of the minute. 
> Did it trigger? That’s much easier to catch if you can see the minute
> transition. 
> If the rack goes down, it needs to be back up fast…..
> 
> Bob
> 
> 
> > On Jan 23, 2017, at 2:36 AM, Robert Atkinson via time-nuts
> > <time-nuts@febo.com> wrote:
> > 
> > One must remember the original use of these displays was displaying IRIG
> > time either distributed from a master clock, locally generated or from a
> > recording (tape) They long predate GPS. There are more sophisticated units
> > that include controls for the tape recorder so you could auto search to a
> > certain time. Multiple displays could be used for locally generated time,
> > time received from a remote site by fixed line or radio and time from data
> > or video recorders.I have a number of them and one sits above my GPStar as
> > the LCD on the GPStar is hard to read from across the workshop and it lets
> > me have time available while showing timing or satellite  status on the GPS.
> > Just picked up 3 more (RAPCO 104 anyone have a manual for these) at the
> > weekend.
> > Robert G8RPI.
> > 
> >  From: Bob Bownes <bow...@gmail.com>
> > To: Discussion of precise time and frequency measurement
> > <time-nuts@febo.com> 
> > Sent: Sunday, 22 January 2017, 18:33
> > Subject: Re: [time-nuts] purpose of time of day display units
> > 
> > 
> > #5) Everyone likes blinkenlights. 
> > 
> 
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Re: [time-nuts] purpose of time of day display units

[Bob Camp]

Hi

Trying to troubleshoot those racks *without* being able to see the timing is
harder than if you can. This gizmo should trigger at the top of the minute. 
Did it trigger? That’s much easier to catch if you can see the minute 
transition. 
If the rack goes down, it needs to be back up fast…..

Bob


> On Jan 23, 2017, at 2:36 AM, Robert Atkinson via time-nuts 
> <time-nuts@febo.com> wrote:
> 
> One must remember the original use of these displays was displaying IRIG time 
> either distributed from a master clock, locally generated or from a recording 
> (tape) They long predate GPS. There are more sophisticated units that include 
> controls for the tape recorder so you could auto search to a certain time. 
> Multiple displays could be used for locally generated time, time received 
> from a remote site by fixed line or radio and time from data or video 
> recorders.I have a number of them and one sits above my GPStar as the LCD on 
> the GPStar is hard to read from across the workshop and it lets me have time 
> available while showing timing or satellite  status on the GPS. Just picked 
> up 3 more (RAPCO 104 anyone have a manual for these) at the weekend.
> Robert G8RPI.
> 
>  From: Bob Bownes <bow...@gmail.com>
> To: Discussion of precise time and frequency measurement <time-nuts@febo.com> 
> Sent: Sunday, 22 January 2017, 18:33
> Subject: Re: [time-nuts] purpose of time of day display units
> 
> 
> #5) Everyone likes blinkenlights. 
> 

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Re: [time-nuts] purpose of time of day display units

[Tim Shoppa]

http://www.washingtonpost.com/lifestyle/style/for-public-clocks-a-time-warp/2011/10/25/gIQAXOZ5jM_story.html

"If the clocks are right — on churches and in classrooms, on stores and in
bars — they tell us that things are in order. They tell us that people
are paying attention. If a clock is wrong, maybe everything else is,
too."


On Sun, Jan 22, 2017 at 1:31 AM, Ruslan Nabioullin 
wrote:

> Hi, looking at pictures of various time metrology equipment setups for
> best practices and inspiration, I have commonly seen time of day display
> unit(s) installed in racks containing processing or time transfer
> equipment, e.g., http://www.xyht.com/wp-content/uploads/2015/05/Powers_
> Master_Clock.jpg. All that these units do is merely display the time of
> day and sometimes the date, typically by means of seven segment LED
> displays, of the time code inputted to them (typically IRIG-B, I'm
> guessing).  Any ideas why such a unit is necessary when one can simply look
> at the time displayed by timing receivers and time code generators (and
> even some standards), and the interface of some fusor, defined in this
> context as a system which performs timing data fusion (by implementing a
> paper clock or a more primitive algorithm) and timekeeping, either by means
> of a direct shell, or via something like NTP?
>
> Thanks in advance,
> Ruslan
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/m
> ailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] purpose of time of day display units

[Robert Atkinson via time-nuts]

One must remember the original use of these displays was displaying IRIG time 
either distributed from a master clock, locally generated or from a recording 
(tape) They long predate GPS. There are more sophisticated units that include 
controls for the tape recorder so you could auto search to a certain time. 
Multiple displays could be used for locally generated time, time received from 
a remote site by fixed line or radio and time from data or video recorders.I 
have a number of them and one sits above my GPStar as the LCD on the GPStar is 
hard to read from across the workshop and it lets me have time available while 
showing timing or satellite  status on the GPS. Just picked up 3 more (RAPCO 
104 anyone have a manual for these) at the weekend.
Robert G8RPI.

  From: Bob Bownes <bow...@gmail.com>
 To: Discussion of precise time and frequency measurement <time-nuts@febo.com> 
 Sent: Sunday, 22 January 2017, 18:33
 Subject: Re: [time-nuts] purpose of time of day display units
   

#5) Everyone likes blinkenlights. 



> On Jan 22, 2017, at 08:55, jimlux <jim...@earthlink.net> wrote:
> 
>> On 1/21/17 10:31 PM, Ruslan Nabioullin wrote:
>> Hi, looking at pictures of various time metrology equipment setups for
>> best practices and inspiration, I have commonly seen time of day display
>> unit(s) installed in racks containing processing or time transfer
>> equipment, e.g.,
>> http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.jpg.
>> All that these units do is merely display the time of day and sometimes
>> the date, typically by means of seven segment LED displays, of the time
>> code inputted to them (typically IRIG-B, I'm guessing).
> 
> There's a few reasons I can think of:
> 1) the display is also a distribution amplifier of some sort - one time 
> source going into rack, distributed to things in the rack (or the next rack)
> 
> 2) as phk commented, it lets you know that your time code isn't broken (i.e. 
> someone got in behind the rack and disconnected the wrong cable)
> 
> 3) It's a crude visual check - your eye/brain is pretty good at catching a 
> change in the pattern of blinky lights.  IN this situation, you'd expect all 
> the displays to change simultaneously.
> 
> 4) the equipment configuration "just growed" from a collection of smaller 
> ones, each with its own display.
> 
> We put displays like this in all of our ground support equipment (GSE) racks 
> when doing spacecraft or subsystem tests, mostly for reason #2 and #4.
> 
> You might have a GSE rack or two in the lab when you're building up the 
> subsystem.  Someone else's subsystem has their rack, also with a timecode 
> display.  When you bring the two subsystems together for integration, you 
> bring the racks with them, and it's not worth it to reconfigure.
> 
> 
> 
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Re: [time-nuts] purpose of time of day display units

[Chris Albertson]

I do stuff like that too.   I always like to use an I2C connected LCD
display while developing code on any micro processor project.  I might take
the actual LCD off at the end but I always leave the signal pins in place.
I might need to debug the device again some time and then I can find
another display.  I see a lot of this in commercial products, for example a
USB connection on the back of my TV, only for diagnostic use.

Same with "heartbeat" LEDs, they let you know the device is cycling through
its main pressing loop and not hung.

On Sun, Jan 22, 2017 at 4:26 PM, Hal Murray  wrote:

>
>
> Is there a term similar to "eye candy" for geeks?
>
> Many years ago, I designed network gear.  That was back when a controller
> was
> a board full of small and medium sized chips rather than a single big chip.
> I always put a few LEDs on the board wired up where the microcode could get
> at them.  Most of the time they were just eye candy.  But occasionally I
> would borrow one and hack the microcode so a LED would be interesting on a
> scope.
>
>
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
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> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>



-- 

Chris Albertson
Redondo Beach, California
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Re: [time-nuts] purpose of time of day display units

[Ruslan Nabioullin]

On 01/22/2017 07:26 PM, Hal Murray wrote:

Many years ago, I designed network gear.  That was back when a controller was
a board full of small and medium sized chips rather than a single big chip.
I always put a few LEDs on the board wired up where the microcode could get
at them.  Most of the time they were just eye candy.  But occasionally I
would borrow one and hack the microcode so a LED would be interesting on a
scope.


Ah, just like those status LEDs on PCBs, subsystems, and modules in 
properly-engineered equipment (both old and modern minicomputers, 
aerospace equipment, VME and VXI systems, some other servers [some of 
HP's small servers, at least, even feature a neat diagram on the front 
panel, with status LEDs indicating the status of key subsystems or 
components thereof], etc.)  Apple's hardware obviously is an offender in 
this regard---I remember once having to service an iMac (or some other 
modern Apple PC), and I seriously could not figure out how to turn it 
on, and when I had to temporarily shut off the power distribution 
system, I could not figure out what the PC's power state was (to ensure 
a graceful shutdown of the system).


-Ruslan
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Re: [time-nuts] purpose of time of day display units

[Jeremy Nichols]

I have done something similar to one of my cars so that, for example, an
LED that tells me when the a/c compressor's electric clutch cycles on and
off. Things like this are partly eye candy, partly educational (things
don't always work quite like I assume they do), and partly a valuable
diagnostic tool when something breaks.

Jeremy


On Sun, Jan 22, 2017 at 6:01 PM Hal Murray  wrote:

> jim...@earthlink.net said:
>
> > 3) It's a crude visual check - your eye/brain is pretty good at
> catching  a
>
> > change in the pattern of blinky lights.  IN this situation, you'd  expect
>
> > all the displays to change simultaneously.
>
>
>
> Is there a term similar to "eye candy" for geeks?
>
>
>
> Many years ago, I designed network gear.  That was back when a controller
> was
>
> a board full of small and medium sized chips rather than a single big chip.
>
> I always put a few LEDs on the board wired up where the microcode could get
>
> at them.  Most of the time they were just eye candy.  But occasionally I
>
> would borrow one and hack the microcode so a LED would be interesting on a
>
> scope.
>
>
>
>
>
>
>
>
>
> --
>
> These are my opinions.  I hate spam.
>
>
>
>
>
>
>
> ___
>
> time-nuts mailing list -- time-nuts@febo.com
>
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>
> and follow the instructions there.
>
> --
Sent from Gmail Mobile
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Re: [time-nuts] purpose of time of day display units

[Scott Stobbe]

There is a lot to be said about a tool that just works. In the advent of a
piece of gear failing whether that be a firmware bug or a cooling fan, or
more severe, having a known diagnostic tool during that time is priceless
(well maybe not priceless but extremely nice to have).

On Sun, Jan 22, 2017 at 1:31 AM, Ruslan Nabioullin 
wrote:

> Hi, looking at pictures of various time metrology equipment setups for
> best practices and inspiration, I have commonly seen time of day display
> unit(s) installed in racks containing processing or time transfer
> equipment, e.g., http://www.xyht.com/wp-content/uploads/2015/05/Powers_
> Master_Clock.jpg. All that these units do is merely display the time of
> day and sometimes the date, typically by means of seven segment LED
> displays, of the time code inputted to them (typically IRIG-B, I'm
> guessing).  Any ideas why such a unit is necessary when one can simply look
> at the time displayed by timing receivers and time code generators (and
> even some standards), and the interface of some fusor, defined in this
> context as a system which performs timing data fusion (by implementing a
> paper clock or a more primitive algorithm) and timekeeping, either by means
> of a direct shell, or via something like NTP?
>
> Thanks in advance,
> Ruslan
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/m
> ailman/listinfo/time-nuts
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>
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Re: [time-nuts] purpose of time of day display units

[Hal Murray]

jim...@earthlink.net said:
> 3) It's a crude visual check - your eye/brain is pretty good at catching  a
> change in the pattern of blinky lights.  IN this situation, you'd  expect
> all the displays to change simultaneously. 

Is there a term similar to "eye candy" for geeks?

Many years ago, I designed network gear.  That was back when a controller was 
a board full of small and medium sized chips rather than a single big chip.  
I always put a few LEDs on the board wired up where the microcode could get 
at them.  Most of the time they were just eye candy.  But occasionally I 
would borrow one and hack the microcode so a LED would be interesting on a 
scope.




-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] purpose of time of day display units

[Chris Albertson]

I used to work at a place that used a lot of those LED time displays that
were hooked up to IRIG.   Why were they there?  Because everyone hates to
toss out nice working equipment.  The displays were bought ages ago and
still work just fine. Many of those racks you see were assembled 15 or
more years ago.

Today my cell phone has a time display that is just as accurate as a GPS
controlled LED display because the bottle neck for displays is human
perception, We just can't see better than about 1/20th of a second.

Sometimes however we'd run the equipment with the time of day not set to
the actual time of day, say for re-playing historic data.  THEN the display
is nice to have if for nothing else to verify the setup is working and you
are in fact sync's up to recored IRIG from some 20 year old database or
even tape.But even for real time, the display verifies the system is
running.  If it matches your iPhone then all is good.

In short the best use of these displays is confidence that things are
working.  Because you know they display is driven by IRIRG and not by a
realtime clock, so if you are getting IRIG data, you are up and running to
at least some degree.



On Sat, Jan 21, 2017 at 10:31 PM, Ruslan Nabioullin 
wrote:

> Hi, looking at pictures of various time metrology equipment setups for
> best practices and inspiration, I have commonly seen time of day display
> unit(s) installed in racks containing processing or time transfer
> equipment, e.g., http://www.xyht.com/wp-content/uploads/2015/05/Powers_
> Master_Clock.jpg. All that these units do is merely display the time of
> day and sometimes the date, typically by means of seven segment LED
> displays, of the time code inputted to them (typically IRIG-B, I'm
> guessing).  Any ideas why such a unit is necessary when one can simply look
> at the time displayed by timing receivers and time code generators (and
> even some standards), and the interface of some fusor, defined in this
> context as a system which performs timing data fusion (by implementing a
> paper clock or a more primitive algorithm) and timekeeping, either by means
> of a direct shell, or via something like NTP?
>
> Thanks in advance,
> Ruslan
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/m
> ailman/listinfo/time-nuts
> and follow the instructions there.
>



-- 

Chris Albertson
Redondo Beach, California
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Re: [time-nuts] purpose of time of day display units

[Bob Bownes]

#5) Everyone likes blinkenlights. 



> On Jan 22, 2017, at 08:55, jimlux  wrote:
> 
>> On 1/21/17 10:31 PM, Ruslan Nabioullin wrote:
>> Hi, looking at pictures of various time metrology equipment setups for
>> best practices and inspiration, I have commonly seen time of day display
>> unit(s) installed in racks containing processing or time transfer
>> equipment, e.g.,
>> http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.jpg.
>> All that these units do is merely display the time of day and sometimes
>> the date, typically by means of seven segment LED displays, of the time
>> code inputted to them (typically IRIG-B, I'm guessing).
> 
> There's a few reasons I can think of:
> 1) the display is also a distribution amplifier of some sort - one time 
> source going into rack, distributed to things in the rack (or the next rack)
> 
> 2) as phk commented, it lets you know that your time code isn't broken (i.e. 
> someone got in behind the rack and disconnected the wrong cable)
> 
> 3) It's a crude visual check - your eye/brain is pretty good at catching a 
> change in the pattern of blinky lights.  IN this situation, you'd expect all 
> the displays to change simultaneously.
> 
> 4) the equipment configuration "just growed" from a collection of smaller 
> ones, each with its own display.
> 
> We put displays like this in all of our ground support equipment (GSE) racks 
> when doing spacecraft or subsystem tests, mostly for reason #2 and #4.
> 
> You might have a GSE rack or two in the lab when you're building up the 
> subsystem.  Someone else's subsystem has their rack, also with a timecode 
> display.   When you bring the two subsystems together for integration, you 
> bring the racks with them, and it's not worth it to reconfigure.
> 
> 
> 
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Re: [time-nuts] purpose of time of day display units

[jimlux]

On 1/21/17 10:31 PM, Ruslan Nabioullin wrote:

Hi, looking at pictures of various time metrology equipment setups for
best practices and inspiration, I have commonly seen time of day display
unit(s) installed in racks containing processing or time transfer
equipment, e.g.,
http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.jpg.
All that these units do is merely display the time of day and sometimes
the date, typically by means of seven segment LED displays, of the time
code inputted to them (typically IRIG-B, I'm guessing).


There's a few reasons I can think of:
1) the display is also a distribution amplifier of some sort - one time 
source going into rack, distributed to things in the rack (or the next rack)


2) as phk commented, it lets you know that your time code isn't broken 
(i.e. someone got in behind the rack and disconnected the wrong cable)


3) It's a crude visual check - your eye/brain is pretty good at catching 
a change in the pattern of blinky lights.  IN this situation, you'd 
expect all the displays to change simultaneously.


4) the equipment configuration "just growed" from a collection of 
smaller ones, each with its own display.


We put displays like this in all of our ground support equipment (GSE) 
racks when doing spacecraft or subsystem tests, mostly for reason #2 and #4.


You might have a GSE rack or two in the lab when you're building up the 
subsystem.  Someone else's subsystem has their rack, also with a 
timecode display.   When you bring the two subsystems together for 
integration, you bring the racks with them, and it's not worth it to 
reconfigure.




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Re: [time-nuts] purpose of time of day display units

[Tim Shoppa]

The big clocks on the walls of the control center were largely eye-candy
for visitors, but the individual clocks at each console were continuously
used by the operators for everything (there was no computer display of
time). All important technical timing was run from dedicated sequencers but
it might be "kicked off" from IRIG-derived pulses on some occasions (in my
experience it might be spec'ed to be kicked off from IRIG but in real life
it was initiated by pushbutton).

Some control centers used a second audio channel to distribute elapsed
mission time via IRIG. That wasn't exactly my kind of control center but I
got to visit them.

In decades past I worked extensively with analog multitrack telemetry and
voice recorders that would record the IRIG analog code at same time as data
and voice. On playback we would both watch pulses and carrier from IRIG on
pen charts and scopes to derive timestamps, and we would also hook up a
standard IRIG-driven clock to the recorded IRIG audio show where we were in
the playback. We had at least one special playback station that could show
IRIG time correctly through variable speed forward and reverse driven by
the IRIG audio carrier. Much later we used minicomputers with ADC's to
digitize the data, timestamp derived from IRIG audio.

Tim N3QE


On Sun, Jan 22, 2017 at 1:31 AM, Ruslan Nabioullin 
wrote:

> Hi, looking at pictures of various time metrology equipment setups for
> best practices and inspiration, I have commonly seen time of day display
> unit(s) installed in racks containing processing or time transfer
> equipment, e.g., http://www.xyht.com/wp-content/uploads/2015/05/Powers_
> Master_Clock.jpg. All that these units do is merely display the time of
> day and sometimes the date, typically by means of seven segment LED
> displays, of the time code inputted to them (typically IRIG-B, I'm
> guessing).  Any ideas why such a unit is necessary when one can simply look
> at the time displayed by timing receivers and time code generators (and
> even some standards), and the interface of some fusor, defined in this
> context as a system which performs timing data fusion (by implementing a
> paper clock or a more primitive algorithm) and timekeeping, either by means
> of a direct shell, or via something like NTP?
>
> Thanks in advance,
> Ruslan
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Re: [time-nuts] purpose of time of day display units

[Poul-Henning Kamp]

In message <537e808d-731c-42de-90f3-bec55363b...@sfr.fr>, Mike Cook writes:

>All that these units do is merely display the time of day and
>sometimes the date, typically by means of seven segment LED displays,
>of the time code inputted to them (typically IRIG-B, I'm guessing).

I can imagine two reasons:

A) Trying to explain a $1M set of racks keeping track of time, without
   them actually showing the time is a lot harder.

B) Visual indication that your IRIG-B is fine.


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] purpose of time of day display units

[Mike Cook]

Two reasons that come to mind are:
  Displaying distributed time to distant sites from some master.
  Readability at a distance.  


> Le 22 janv. 2017 à 07:31, Ruslan Nabioullin  a écrit :
> 
> Hi, looking at pictures of various time metrology equipment setups for best 
> practices and inspiration, I have commonly seen time of day display unit(s) 
> installed in racks containing processing or time transfer equipment, e.g., 
> http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.jpg. All 
> that these units do is merely display the time of day and sometimes the date, 
> typically by means of seven segment LED displays, of the time code inputted 
> to them (typically IRIG-B, I'm guessing).  Any ideas why such a unit is 
> necessary when one can simply look at the time displayed by timing receivers 
> and time code generators (and even some standards), and the interface of some 
> fusor, defined in this context as a system which performs timing data fusion 
> (by implementing a paper clock or a more primitive algorithm) and 
> timekeeping, either by means of a direct shell, or via something like NTP?
> 
> Thanks in advance,
> Ruslan
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"The power of accurate observation is commonly called cynicism by those who 
have not got it. »
George Bernard Shaw

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[time-nuts] purpose of time of day display units

[Ruslan Nabioullin]

Hi, looking at pictures of various time metrology equipment setups for 
best practices and inspiration, I have commonly seen time of day display 
unit(s) installed in racks containing processing or time transfer 
equipment, e.g., 
http://www.xyht.com/wp-content/uploads/2015/05/Powers_Master_Clock.jpg. 
All that these units do is merely display the time of day and sometimes 
the date, typically by means of seven segment LED displays, of the time 
code inputted to them (typically IRIG-B, I'm guessing).  Any ideas why 
such a unit is necessary when one can simply look at the time displayed 
by timing receivers and time code generators (and even some standards), 
and the interface of some fusor, defined in this context as a system 
which performs timing data fusion (by implementing a paper clock or a 
more primitive algorithm) and timekeeping, either by means of a direct 
shell, or via something like NTP?


Thanks in advance,
Ruslan
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