Jump to content

mobileopticsguy

S4GRU Member
  • Posts

    6
  • Joined

  • Last visited

Profile Information

  • Phones/Devices
    Kyocera Hydros
  • Gender
    Male
  • Location
    New York
  • Here for...
    4G Information
  • Favorite Quotation
    "What, me worry?" - Alred E. Neuman

mobileopticsguy's Achievements

Member Level:  Smoke Signals

Member Level: Smoke Signals (1/12)

1

Reputation

  1. With the GMO, are the RRUs are still connected to the BBU via a fiber optic connection, just a shorter one?
  2. I'm trying to get a handle on the specifics of RRU-BBU connections. Ultimately I care about the number of SFP/SFP+ transceivers an RRU is equipped with. I know the RRU-BBU can be connected via either two-fiber with TX and Rx on different fibers, or single-fiber if bi-directional, so let's use the term 'links' instead of 'number of fibers' to keep things simple. 1. How many 'links' does an RRU need back to the BBU? What determines how many are required? 2. How many transceivers can an RRU handle? I know they aren't all identical, so what is typical, what is the max, etc.? I think based on my research that the answer is very nearly always '1 link per RRH to the BBU'. (One exception I know of is the NSN FlexiRadio RRU which has three optical ports.) A colleague believes the answer is '1 per attached RF transceiver', which means multiple fiber links from one RRU. Who's right? Another question - in a Ground Mount Option build, with the RRU located at the bottom of the tower, is the connection up to the panel copper or fiber? I read here that 'existing cables can be reused' which seems to imply copper in at least some instances. Thanks.
  3. This is an old thread/article but I found it helpful. Does anyone know in a GMO build is the connection between the RRU on the ground and the panel/antenna up the tower done via optical or coaxial RF cable? Thanks
  4. 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. Bi-directional (simplex) links will have higher loss due to the wavelength filter required, which limits the maximum distance vs. 2-fiber systems.
  5. 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?
  6. 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
×
×
  • Create New...