| Author |
Message |
adam97
Guest
|
 Posted:
Wed Feb 02, 2005 4:08 am Post subject:
Direct Termination or Splicing Termination ? |
|
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Appreciate anyone can advise which termination is better - Direct
termination or Splicing termination for scenario below.
Where can I find the comparison information such as advantage and
disadvantages, signal loss ?
Building: new, 20 floors
Each floor: 2 pair of fiber optic terminations
End termination: collapse at data center at 15 floor
Cable type: multimode 50/125um
Connector: SC coupler
Performance - first priority, costing/time - second.
Environment: Rooms still under renovation, so there are still dust around,
but termination work needs to go ahead.
Thanks in advance
Adam |
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Perkowski
Guest
|
| Posted:
Wed Feb 02, 2005 4:50 am Post subject:
Re: Direct Termination or Splicing Termination ? |
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adam97 wrote:
| Quote: | Appreciate anyone can advise which termination is better - Direct
termination or Splicing termination for scenario below.
Where can I find the comparison information such as advantage and
disadvantages, signal loss ?
Building: new, 20 floors
Each floor: 2 pair of fiber optic terminations
End termination: collapse at data center at 15 floor
Cable type: multimode 50/125um
Connector: SC coupler
Performance - first priority, costing/time - second.
Environment: Rooms still under renovation, so there are still dust around,
but termination work needs to go ahead.
Thanks in advance
Adam
Id pull 2 - 48 strand fiber cables. One to the 5th floor, and the other |
to the 15th floor. Distribute from the 5th floor for floors 1-10, and
distribute from the 15th floor for floors 10-20. Youll get better
performace with fusion splicing, but, if you dont have access to a
fusion splicer you can still mechanical splice.
My 2 cents... |
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Dmitri(Cabling-Design.com
Guest
|
| Posted:
Wed Feb 02, 2005 8:01 am Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
adam97 wrote:
| Quote: | Appreciate anyone can advise which termination is better - Direct
termination or Splicing termination for scenario below.
Where can I find the comparison information such as advantage and
disadvantages, signal loss ?
Building: new, 20 floors
Each floor: 2 pair of fiber optic terminations
End termination: collapse at data center at 15 floor
Cable type: multimode 50/125um
Connector: SC coupler
Performance - first priority, costing/time - second.
Environment: Rooms still under renovation, so there are still dust
around,
but termination work needs to go ahead.
|
| Quote: | Thanks in advance
Adam
|
Hi Adam,
First and foremost just two strands of fiber per floor are not going to
cut it. I do not know the sizes of the floors, but it sounds like a large
enough structure to me. Especially considering that you made cost a second
priority, I would pull 12 strands or at the very least 6 to each floor.
You won't know how to thank yourself enough just couple years from now
when different departments and tenants will start competing for that fiber
capacity. Given enough budget, you cannot go wrong with some extra
capacity.
Pull a separate cable to every floor. It makes administration easier and
provides for greater reliability as well as performance, your #1 priority.
Looks like fusion splicing with factory-made pigtails is the way to go
because of the high performance concern as well as the dust from the
construction. If that stretches your budget too far, you can compromise:
fusion splice all closets but MDF, and then seal the MDF off of the dust
and do terminations there. Multimode terminations are piece of cake, not
matter what termination technology you use, so you can save yourself
$10-$15 per fiber by not buying the pigtail for the MDF end, depending on
your local prices.
Good luck!
--
Dmitri Abaimov, RCDD
http://www.cabling-design.com
Cabling Forum, color codes, pinouts and other useful resources for
premises cabling users and pros
http://www.cabling-design.com/homecabling
Residential Cabling Guide
-------------------------------------
##-----------------------------------------------##
Article posted with Cabling-Design.com Newsgroup Archive
http://www.cabling-design.com/forums
no-spam read and post WWW interface to your favorite newsgroup -
sci.optics.fiber,comp.dcom.cabling - messages and counting!
##-----------------------------------------------## |
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Dale Farmer
Guest
|
| Posted:
Thu Feb 03, 2005 10:47 pm Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
"Dmitri(Cabling-Design.com)" wrote:
| Quote: | adam97 wrote:
Appreciate anyone can advise which termination is better - Direct
termination or Splicing termination for scenario below.
Where can I find the comparison information such as advantage and
disadvantages, signal loss ?
Building: new, 20 floors
Each floor: 2 pair of fiber optic terminations
End termination: collapse at data center at 15 floor
Cable type: multimode 50/125um
Connector: SC coupler
Performance - first priority, costing/time - second.
Environment: Rooms still under renovation, so there are still dust
around,
but termination work needs to go ahead.
Thanks in advance
Adam
Hi Adam,
First and foremost just two strands of fiber per floor are not going to
cut it. I do not know the sizes of the floors, but it sounds like a large
enough structure to me. Especially considering that you made cost a second
priority, I would pull 12 strands or at the very least 6 to each floor.
You won't know how to thank yourself enough just couple years from now
when different departments and tenants will start competing for that fiber
capacity. Given enough budget, you cannot go wrong with some extra
capacity.
Pull a separate cable to every floor. It makes administration easier and
provides for greater reliability as well as performance, your #1 priority.
Looks like fusion splicing with factory-made pigtails is the way to go
because of the high performance concern as well as the dust from the
construction. If that stretches your budget too far, you can compromise:
fusion splice all closets but MDF, and then seal the MDF off of the dust
and do terminations there. Multimode terminations are piece of cake, not
matter what termination technology you use, so you can save yourself
$10-$15 per fiber by not buying the pigtail for the MDF end, depending on
your local prices.
Good luck!
|
If you really don't want to do splicing and termination's on each floor,
you can make custom lengths of cable for each floor, pre terminated
on one end. Pull in from each floor closet to the MDF. This often
gives you better quality termination's, as the termination equipment is
only setup in the MDF. Only costs you some additional labor as
you have to measure and make each length of cable. Since this
presumably a straight vertical run, measurements should be easy.
--Dale |
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jtodd5 dot 1
Guest
|
| Posted:
Thu Feb 03, 2005 11:56 pm Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
Dale Farmer wrote:
| Quote: |
"Dmitri(Cabling-Design.com)" wrote:
adam97 wrote:
Appreciate anyone can advise which termination is better - Direct
termination or Splicing termination for scenario below.
Where can I find the comparison information such as advantage and
disadvantages, signal loss ?
Building: new, 20 floors
Each floor: 2 pair of fiber optic terminations
End termination: collapse at data center at 15 floor
Cable type: multimode 50/125um
Connector: SC coupler
Performance - first priority, costing/time - second.
Environment: Rooms still under renovation, so there are still dust
around,
but termination work needs to go ahead.
Thanks in advance
Adam
Hi Adam,
First and foremost just two strands of fiber per floor are not going to
cut it. I do not know the sizes of the floors, but it sounds like a large
enough structure to me. Especially considering that you made cost a second
priority, I would pull 12 strands or at the very least 6 to each floor.
You won't know how to thank yourself enough just couple years from now
when different departments and tenants will start competing for that fiber
capacity. Given enough budget, you cannot go wrong with some extra
capacity.
Pull a separate cable to every floor. It makes administration easier and
provides for greater reliability as well as performance, your #1 priority.
Looks like fusion splicing with factory-made pigtails is the way to go
because of the high performance concern as well as the dust from the
construction. If that stretches your budget too far, you can compromise:
fusion splice all closets but MDF, and then seal the MDF off of the dust
and do terminations there. Multimode terminations are piece of cake, not
matter what termination technology you use, so you can save yourself
$10-$15 per fiber by not buying the pigtail for the MDF end, depending on
your local prices.
Good luck!
If you really don't want to do splicing and termination's on each floor,
you can make custom lengths of cable for each floor, pre terminated
on one end. Pull in from each floor closet to the MDF. This often
gives you better quality termination's, as the termination equipment is
only setup in the MDF. Only costs you some additional labor as
you have to measure and make each length of cable. Since this
presumably a straight vertical run, measurements should be easy.
--Dale
|
Also, a number of manufactures have preconnectorized cable available. You
just tell them what length and what type of cable, and it come all prepared
, including the pulling sock to protect the connectors during installation. |
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Justin Time
Guest
|
| Posted:
Fri Feb 04, 2005 8:19 pm Post subject:
Re: Direct Termination or Splicing Termination ? |
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|
There have been several suggestions given already, but one other option
to consider would be to use air blown fiber. Once the tubing
infrastructure is in place, you can change fiber counts and even types
quickly and fairly inexpensively.
It has been a couple of years since I looked into it, but if I remember
correctly, one method will allow up to 6 individual strands in a 4 mm
tube while the other will allow a 24 strand bundle in a 7 mm tube.
Neither system is as low cost as a standard fiber installation, but
then you don't have the flexibility of adding fiber or changing from
multi to single mode at a later date with a hard count fiber cable.
Airblown fiber is normally terminated with a fusion spliced pigtail. |
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Al Dykes
Guest
|
| Posted:
Fri Feb 04, 2005 9:01 pm Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
In article <1107530394.489551.83550@c13g2000cwb.googlegroups.com>,
Justin Time <a_user2000@yahoo.com> wrote:
| Quote: | There have been several suggestions given already, but one other option
to consider would be to use air blown fiber. Once the tubing
infrastructure is in place, you can change fiber counts and even types
quickly and fairly inexpensively.
It has been a couple of years since I looked into it, but if I remember
correctly, one method will allow up to 6 individual strands in a 4 mm
tube while the other will allow a 24 strand bundle in a 7 mm tube.
Neither system is as low cost as a standard fiber installation, but
then you don't have the flexibility of adding fiber or changing from
multi to single mode at a later date with a hard count fiber cable.
Airblown fiber is normally terminated with a fusion spliced pigtail.
|
4mm and 7mm ? that's kinda tiny. It's a form factor I'm not familiar
with but I admit I have only voyaristic experience with infrastructure
fiber.
--
a d y k e s @ p a n i x . c o m
Don't blame me. I voted for Gore. |
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adam97
Guest
|
| Posted:
Sun Feb 06, 2005 10:08 pm Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
Thanks for all the advise. I'm new in this.
What level of signal loss should i expect from these various terminations -
diecrt, fusion splicing, mechanical splicing ?
In general, what is the highest acceptable level of signal loss for 1 GE
fibre bacbone ?
Is the bending (more than 45 degree) of the cable really crucial ?
--
Yours Truly,
Adam
Tel:603-5621-7388 Fax:603-5621-6959
"Al Dykes" <adykes@panix.com> wrote in message
news:cu069e$j21$1@panix5.panix.com...
| Quote: | In article <1107530394.489551.83550@c13g2000cwb.googlegroups.com>,
Justin Time <a_user2000@yahoo.com> wrote:
There have been several suggestions given already, but one other option
to consider would be to use air blown fiber. Once the tubing
infrastructure is in place, you can change fiber counts and even types
quickly and fairly inexpensively.
It has been a couple of years since I looked into it, but if I remember
correctly, one method will allow up to 6 individual strands in a 4 mm
tube while the other will allow a 24 strand bundle in a 7 mm tube.
Neither system is as low cost as a standard fiber installation, but
then you don't have the flexibility of adding fiber or changing from
multi to single mode at a later date with a hard count fiber cable.
Airblown fiber is normally terminated with a fusion spliced pigtail.
4mm and 7mm ? that's kinda tiny. It's a form factor I'm not familiar
with but I admit I have only voyaristic experience with infrastructure
fiber.
--
a d y k e s @ p a n i x . c o m
Don't blame me. I voted for Gore. |
|
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Manfred Kwiatkowski
Guest
|
| Posted:
Sun Feb 06, 2005 11:57 pm Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
In article <42064ef8$1_1@news.tm.net.my>,
"adam97" <adam97@streamyx.com> writes:
| Quote: | Thanks for all the advise. I'm new in this.
What level of signal loss should i expect from these various terminations -
diecrt, fusion splicing, mechanical splicing ?
|
Less than to worry about. But I do not know how future proof mechanical
splices are 15 years from now.
| Quote: |
In general, what is the highest acceptable level of signal loss for 1 GE
fibre bacbone ?
|
The standard says 7.5 dB. In practice 10 dB. You will run into
dispersion limitation long before you reach either figure unless
you install your patch cords with sticky fingers. Within a single
building, I have never seen any limitation apply.
| Quote: |
Is the bending (more than 45 degree) of the cable really crucial ?
|
A U-turn around your finger costs 3 dB with single-mode fiber.
So what. Don't do anything to fiber you would not do to copper and
you are fine.
--
Manfred Kwiatkowski kwiatkowski@zrz.tu-berlin.de |
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James Knott
Guest
|
| Posted:
Mon Feb 07, 2005 1:23 am Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
adam97 wrote:
| Quote: | Is the bending (more than 45 degree) of the cable really crucial ?
|
It's not how many degrees you bend the cable, it's the diameter of the bend
that you have to watch. |
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Justin Time
Guest
|
| Posted:
Mon Feb 07, 2005 6:52 pm Post subject:
Re: Direct Termination or Splicing Termination ? |
|
|
Manfred stated:
"adam97" <ada...@streamyx.com> writes:
| Quote: | Thanks for all the advise. I'm new in this.
What level of signal loss should i expect from these various
terminations -
diecrt, fusion splicing, mechanical splicing ?
|
Less than to worry about. But I do not know how future proof mechanical
splices are 15 years from now.
Seeing how 50/125 fiber is being installed, it is doubtful it will be
in use in 15 years. But as far as the longevity that can be expected
out of mechanical splices, it depends. There are mechanical splices
that have been in service on some direct burial cables for over 20
years with no real degradation. And, on the other hand there are
fusion splices that have failed in a matter of weeks all because the
installed failed to do something correctly. |
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