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| | Reviewing residential standard TIA-570-B-1, which I assume also applies to non-residential type designs, there is a distance limitation of 150' for Series-6. If the outlet is further than 150' the standard recommends using Series-11, which has a distance limitation of 295' (coincidence?). Who has installed Series-11 in the horizontal direct to an outlet? I'm being told it can be done, but it's not recommended due to the bend radius, plus it costs a bit more. If you have done this, what do you recommend? Convert to Series-6 at an intermediate "CATV room"? Use a larger backbox, what size? Thanks, Derek
Derek Allison, RCDD/OSP, CSI CDT |
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| Any help?
Derek Allison, RCDD/OSP, CSI CDT |
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| | Derek Typically in such a situation, hotels are a prime example, we run RG-11 down the hallways in some fashion and use taps (not splitters) to make drops into the rooms with RG-6. You need to do calculations for loss and use taps that will provide the strongest signal possible to the room outlets.
Richard S. Anderson, RCDD CSI CDT
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| Here is what our Video Services Director has to say about this:
It really depends on the bandpass, if it is a 550 MHz system, 200’ of RG-6 should not be an issue with the loss being about 9 db. It is another story if you are utilizing 2150 MHz (or ever want to upgrade to a satellite type system) resulting in at least 20 db loss in power not to mention the signal quality issues.
Scott Neighbours
Telecom Coordinator
Apogee Telecom
www.apogeenet.net |
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| I design many large residential developements. Here is what I do. If the longest distance is 170' or below I use all RG6. If it is over 170' (170" is pushing to the limit for a passive CATV system)to the farthest outlet I do everything 150' and below in RG6 and everything above 150' with RG11. With RG11 I spec only a 4 11/16" x 4 11/16" x 2 1/2" box. The RG11 still does not make the bend radius, so I instruct them to couple to a 6" pigtail of RG6 at the outlet. This allows the bend radius with minmal additional loss. This is acceptable to our local provider (COX) as they only like to do passive systems. I know this is a little goofy but it works well and solves the problem. Hope this helps!
Ryan Hall, RCDDMorrissey Engineering rhall@morrisseyengineering.com |
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| | Some great responses. Thanks to all for taking the time. It looks as though I'm going to design to home run the majority of the horizontal cables since this is a dormitory type environment. This will allow for future PON if the client desires to go this route. Being that some of the distances are greater than the 150' for Series-6, we'll propose a CATV room or two on the same floor. I'll route a Series-11 from the TR to each of the CATV rooms, split and amplify the signal, then route Series-6 to each WAO. Please let me know if you foresee and issue with this. Thanks, Derek
Derek Allison, RCDD/OSP, CSI CDT |
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| | Another alternative is to use a modified trunk-n-tap system where a housing with taps is located in the TRs. I use the Total-Tap system. Here, you pull all RG-6 homeruns bask to the TR (will all of the TRs homerunning back to the main). This allows you to maintain a structured cabling feel and makes it easier to do the anticipated drop calculations. The only real issue you have with length is the effects of cable slope. However, they even have a tap insert for that. You are basically providing a housing with a series of different value taps to which you terminate your incoming drop cables. Hope this helps! |
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| | Will that work with my horizontal distance being over the 150'? The problem I see is that I'd be well over 150' when routing back to the TR. So to work around it I'd have to designate another area (CATV Rm) on the floor. Here I could split from Series 11 to Series 6, and may have to amplify. Are you saying there is another method where I can homerun back to the TR and it will work just fine even though I'm near 290' in some cases.
Derek Allison, RCDD/OSP, CSI CDT |
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| I would agree the tap method is the best way to go, but only if this is a single client or tenant for the RF services being delivered. If this is an apartment or condo developement, the CATV provider will most likely want a disconnect in the TR or CTR. Using the tap method may only offer one range of services, and the client may only have the option of on/off.
Ryan Hall, RCDDMorrissey Engineering rhall@morrisseyengineering.com |
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