Jump to content

  •  

Photo

How to Spot Sprint 8T8R TDD-LTE RRHs (Samsung)

Samsung STA TDD-LTE TD-LTE 8T8R 2500mhz 2600mhz BRS EBS Band 41

  • Please log in to reply
64 replies to this topic

#41 superbluepsd

superbluepsd

    Member Level: 1x Advanced

  • S4GRU Premier Sponsor
  • PipPip
  • 135 posts
  • Phones/Devices:GS7
  • LocationPortland, Oregon

Posted 29 September 2014 - 03:40 AM

Does an 8T8R installation at a previously completed NV 1.0 site require a new set of hybrid fiber cables to be run from the MMBS up the tower to the 8T8R RRU's?



#42 amcferrin90

amcferrin90

    Member Level: 4G WiMax

  • S4GRU Premier Sponsor
  • PipPipPipPip
  • 1,080 posts
  • Phones/Devices:LG G3 D850
  • LocationUnited States - Columbus, OH

Posted 29 September 2014 - 04:59 AM

Does an 8T8R installation at a previously completed NV 1.0 site require a new set of hybrid fiber cables to be run from the MMBS up the tower to the 8T8R RRU's?

That's a tricky question. Think that depends on how early in NV1.0 that site was built or converted. The site near my house was reworked May 2013 and they did not pull another snake up the pole. However a site in town was upgraded later and had to have additional cabling pulled.

#43 superbluepsd

superbluepsd

    Member Level: 1x Advanced

  • S4GRU Premier Sponsor
  • PipPip
  • 135 posts
  • Phones/Devices:GS7
  • LocationPortland, Oregon

Posted 29 September 2014 - 05:11 AM

That's a tricky question. Think that depends on how early in NV1.0 that site was built or converted. The site near my house was reworked May 2013 and they did not pull another snake up the pole. However a site in town was upgraded later and had to have additional cabling pulled.

Well the sites in my area were mostly NV 1.0 complete between Feb and Aug 2013.   I ask the question because I have recently started to notice an additional panel mounted on the Sprint rack next to the NV 1.0 panels on a few of the sites around here.   I did a quick site visit to a couple sites and saw no new cables from the MMBS.    I need to revist with a pair of binoculars and a DSLR to confirm what this additional panel is.    Hoping for 8T8R!



#44 amcferrin90

amcferrin90

    Member Level: 4G WiMax

  • S4GRU Premier Sponsor
  • PipPipPipPip
  • 1,080 posts
  • Phones/Devices:LG G3 D850
  • LocationUnited States - Columbus, OH

Posted 29 September 2014 - 05:25 AM

Well the sites in my area were mostly NV 1.0 complete between Feb and Aug 2013. I ask the question because I have recently started to notice an additional panel mounted on the Sprint rack next to the NV 1.0 panels on a few of the sites around here. I did a quick site visit to a couple sites and saw no new cables from the MMBS. I need to revist with a pair of binoculars and a DSLR to confirm what this additional panel is. Hoping for 8T8R!

Post a pic here from your phone. There's enough of us here that could tell you unless its on the few sprint towers that they didn't use the bottom rung.

#45 ryry4ya

ryry4ya

    Member Level: 4G WiMax

  • S4GRU Member
  • PipPipPipPip
  • 1,205 posts
  • Phones/Devices:EVO LTE/ One
  • LocationSylvania/Toledo ohio

Posted 29 October 2014 - 09:36 AM

Does anybody know why is there an additional cabinet sometimes for band 41and sometimes they don't put an additional cabinet. ?

#46 awsum gam3r

awsum gam3r

    Member Level: 1x Advanced

  • S4GRU Member
  • PipPip
  • 111 posts
  • Phones/Devices:Galaxy S5 baby
  • Location46808

Posted 30 October 2014 - 02:07 PM

So is there a clearwire BS with 8T8R antennas?


Posted Image B) B) B)


#47 lilotimz

lilotimz

    S4GRU Moderator

  • S4GRU Staff
  • 8,595 posts
  • Phones/Devices:Pixel 5", Nexus 7 (2013) & 9 (2014), GS8, GS7, iPad Air 2
  • LocationSacramento, CA, USA

Posted 30 October 2014 - 02:26 PM

So is there a clearwire BS with 8T8R antennas?


No.

Sent from my Nexus 5 using Tapatalk

#48 ryry4ya

ryry4ya

    Member Level: 4G WiMax

  • S4GRU Member
  • PipPipPipPip
  • 1,205 posts
  • Phones/Devices:EVO LTE/ One
  • LocationSylvania/Toledo ohio

Posted 30 October 2014 - 02:27 PM

Why is there an additional cabinet? The site is not high capacity. There's other sites they have additional cabs.. Why some have it why do some not?

#49 awsum gam3r

awsum gam3r

    Member Level: 1x Advanced

  • S4GRU Member
  • PipPip
  • 111 posts
  • Phones/Devices:Galaxy S5 baby
  • Location46808

Posted 30 October 2014 - 02:29 PM

No.

Sent from my Nexus 5 using Tapatalk

mhm. Okay, thanks. I just wanted to make sure because this one site has only two Base Stations and is putting out Bands 25/26/41. I thought for B41, there was an base station to go with it. But that's awesome anyways! 

Thank you.


Posted Image B) B) B)


#50 lilotimz

lilotimz

    S4GRU Moderator

  • S4GRU Staff
  • 8,595 posts
  • Phones/Devices:Pixel 5", Nexus 7 (2013) & 9 (2014), GS8, GS7, iPad Air 2
  • LocationSacramento, CA, USA

Posted 30 October 2014 - 02:41 PM

mhm. Okay, thanks. I just wanted to make sure because this one site has only two Base Stations and is putting out Bands 25/26/41. I thought for B41, there was an base station to go with it. But that's awesome anyways!
Thank you.


For band 41 it's an uadu (carrier card) addition along with base station modifications. New hybrid cable maybe if the existing hybrid wires don't have enough fiber support and the new antenna and radios up top.

Some sites have two cabinets because of high capacity setups.

Sent from my Nexus 5 using Tapatalk

#51 awsum gam3r

awsum gam3r

    Member Level: 1x Advanced

  • S4GRU Member
  • PipPip
  • 111 posts
  • Phones/Devices:Galaxy S5 baby
  • Location46808

Posted 31 October 2014 - 12:41 PM

n2d108.jpg
Lookin good, I had to be next to the tower to get a decent 2500 signal. It doesn't seem to reach very far. I managed to pulled a 18mb DL on 105 DB

Posted Image B) B) B)


#52 mobileopticsguy

mobileopticsguy

    Member Level: Smoke Signals

  • S4GRU Member
  • 5 posts
  • Phones/Devices:Kyocera Hydros
  • LocationNew York

Posted 31 October 2014 - 01:24 PM

Caught a decent shot of a 2.5 RRH just before the tower crew flew it. I got pulled into a ticket for an outage at the site and noticed the door was open, so I went for a ride to see who was there. I added another photo of the entire assembly as well.

 

Because of the way they had to mount the pole to the t-frame, they couldn't connect the jumpers until it was secured.

 

IMGP5698.JPG

 

IMGP5702.JPG

The RRH-B8 shown in the photo connects to the BBU via a hybrid power/CPRI cable (that plugs into the black port on the left of the box in the photo.).  THe installation manual says the cable has '4 optical fiber cores plus a spare'..  Does anyone know what that translates to in terms of the number of individual fibers in the cable? If its duplex there would be 2x4+2x1=10 fibers.. but that is an oddball number.. they are usually 6 or 12 as I understand it. Another way to ask the question is how many LC connectors are on the other end of the cable? The install manual shows three LC connectors plugging into the BBU, which would be 6 fibers.  Anyone know for sure what the answer is?  Thanks



#53 jeremyandrew

jeremyandrew

    Member Level: 1x Advanced

  • Honored Premier Sponsor
  • PipPip
  • 144 posts
  • Phones/Devices:Samsung GS3 stock/rooted, iPhone 4S
  • LocationErie, Pennsylvania

Posted 31 October 2014 - 01:43 PM

The fiber "cans" have 4 LC connections in them. And a single fiber runs full duplex, TX and RX are different wavelengths and the GBICs are specific to the Radio head or the element they are seated in.

#54 mobileopticsguy

mobileopticsguy

    Member Level: Smoke Signals

  • S4GRU Member
  • 5 posts
  • Phones/Devices:Kyocera Hydros
  • LocationNew York

Posted 31 October 2014 - 03:04 PM

The fiber "cans" have 4 LC connections in them. And a single fiber runs full duplex, TX and RX are different wavelengths and the GBICs are specific to the Radio head or the element they are seated in.

So since LC connectors are two-fiber, there are 8 individual fibers serving the RRU?   And since each fiber is bi-directional, one fiber can carry a CPRI channel, so a total of 8 CPRI channels (max) are carried from the RRU to the BBU? I guess that makes sense if this is a 8T8R unit.

 

More generally, is it as simple as just counting the number of coax jumper ports on the RRU to get the number of fiber links to the BBU? 



#55 lilotimz

lilotimz

    S4GRU Moderator

  • S4GRU Staff
  • 8,595 posts
  • Phones/Devices:Pixel 5", Nexus 7 (2013) & 9 (2014), GS8, GS7, iPad Air 2
  • LocationSacramento, CA, USA

Posted 31 October 2014 - 03:08 PM

The RRH-B8 shown in the photo connects to the BBU via a hybrid power/CPRI cable (that plugs into the black port on the left of the box in the photo.).  THe installation manual says the cable has '4 optical fiber cores plus a spare'..  Does anyone know what that translates to in terms of the number of individual fibers in the cable? If its duplex there would be 2x4+2x1=10 fibers.. but that is an oddball number.. they are usually 6 or 12 as I understand it. Another way to ask the question is how many LC connectors are on the other end of the cable? The install manual shows three LC connectors plugging into the BBU, which would be 6 fibers.  Anyone know for sure what the answer is?  Thanks

 

kEvbSVT.jpg



#56 jeremyandrew

jeremyandrew

    Member Level: 1x Advanced

  • Honored Premier Sponsor
  • PipPip
  • 144 posts
  • Phones/Devices:Samsung GS3 stock/rooted, iPhone 4S
  • LocationErie, Pennsylvania

Posted 01 November 2014 - 05:24 AM

So since LC connectors are two-fiber, there are 8 individual fibers serving the RRU? And since each fiber is bi-directional, one fiber can carry a CPRI channel, so a total of 8 CPRI channels (max) are carried from the RRU to the BBU? I guess that makes sense if this is a 8T8R unit.

More generally, is it as simple as just counting the number of coax jumper ports on the RRU to get the number of fiber links to the BBU?


LC connectors are not "two fiber", each LC connector supports a single piece of glass. This design is odd in the fact that it uses a single fiber for TX/RX. I have stress tested the Single-mode fibers in a hybrid cable and they do just fine at 1Gbps throughput.

1 fiber from each RRH goes to each of the 3 channel cards, that is of course assuming an 8T8R configuration.

#57 mobileopticsguy

mobileopticsguy

    Member Level: Smoke Signals

  • S4GRU Member
  • 5 posts
  • Phones/Devices:Kyocera Hydros
  • LocationNew York

Posted 01 November 2014 - 08:03 AM

JeremyA -  Thanks for clarifying how that system works for me.

 

FWIW LC connectors do come in simplex and duplex flavors; I know duplex is more common for fronthaul so I assumed that's what this system used.

clip_image027_0000.jpg

Bi-directional (simplex) links will have higher loss due to the wavelength filter required, which limits the maximum distance vs. 2-fiber systems.



#58 techfranz

techfranz

    Member Level: 1x Advanced

  • S4GRU Member
  • PipPip
  • 149 posts
  • Phones/Devices:Sprint LG G4
  • LocationLancaster PA

Posted 23 August 2015 - 03:38 PM

Certainly is not an ideal condition, but yes they can be put into what some call a ground mount radio unit type setup. Essentially the way most setups were done before network vision decided to pop em up top and get all that distance out of the way.


Sent from my iPad using Tapatalk HD

Ok, a radio burns out and needs replaced...am I correct in how this goer?

Old Way -Technician drives to the Cell Site and never leaves the ground to replace the Cellular Radio.

New Way -Technician must climb the tower to replace the radio.

 

Will Maintenance be more expensive with the radios so close to the antennas high off the ground?

Also makes a nice "cabley" mess up top of the tower.



#59 payturr

payturr

    Member Level: eHRPD

  • S4GRU Premier Sponsor
  • PipPipPip
  • 611 posts
  • Phones/Devices:iPhone 6s
  • LocationNYC

Posted 23 August 2015 - 04:10 PM

Ok, a radio burns out and needs replaced...am I correct in how this goer?

Old Way -Technician drives to the Cell Site and never leaves the ground to replace the Cellular Radio.

New Way -Technician must climb the tower to replace the radio.

 

Will Maintenance be more expensive with the radios so close to the antennas high off the ground?

Also makes a nice "cabley" mess up top of the tower.

There was never an old way; Sprint started using RRUs in Network Vision, before that it was amplifiers on the coax lines.

 

RRUs are only ground mounted in cases where they don't replace the legacy panels. They hang RRUs when they get the permits to replace the panels with NV ones. Putting the RRUs behind the panel is the smart thing to do because the signal loss from the coax is lowered significantly.


*insert logical argument here*


#60 techfranz

techfranz

    Member Level: 1x Advanced

  • S4GRU Member
  • PipPip
  • 149 posts
  • Phones/Devices:Sprint LG G4
  • LocationLancaster PA

Posted 23 August 2015 - 04:23 PM

There was never an old way; Sprint started using RRUs in Network Vision, before that it was amplifiers on the coax lines.

RRUs are only ground mounted in cases where they don't replace the legacy panels. They hang RRUs when they get the permits to replace the panels with NV ones. Putting the RRUs behind the panel is the smart thing to do because the signal loss from the coax is lowered significantly.

I understand from your comment, before network vision the actual radio was in a cabinet on the ground and the amplifier was where the RRU is now on top of the tower behind the antenna panel?

Sent from my LGLS991 using Tapatalk





Also tagged with one or more of these keywords: Samsung, STA, TDD-LTE, TD-LTE, 8T8R, 2500mhz, 2600mhz, BRS, EBS, Band 41

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users