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Frequently Asked Questions

1. What equipment is required to get started?

From a simple lab setup to a full deployment, there are required products and accessories for a functioning GPON network. They consists of an: Router, OLT, ONU, GPON SFP Module, SC/UPC to SC/APC single-mode fiber patch cable, PLC Splitter (either a 1:32 ratio or added attenuators), SC/APC to SC/APC single-mode fiber patch cable. For a full topology example, see our Getting Started and accessories article.

2. What is the difference between Active and Passive fiber?

Active fiber requires powered devices at the head end and end point as well as each connection or distribution point in the full path of the fiber.

Passive fiber allows for multiple connections across the same fiber strand using multiple splits with optical splitters such as a PLC splitter which does not use power at the location of the splitter, but requires power at the head end (OLT) and end point (ONU).

3. What is the difference between Class B+ and Class C+ modules?
The UFiber OLT includes a single UF-GP-B+ module in the package. Users can add more GPON SFP modules to populate the other PON ports. The advantage of using a C+ module over a B+ module is the added transmit power of the C+ modules which helps overcome attenuation to ensure there is an acceptable signal level at the ONU. For more details view our Designing a GPON Network article and the GPON Modules product page
4. Can I rate-limit customers using the OLT?
Yes! With firmware version 3.0 and higher each ONU profile has a bandwidth limit option to specify the bandwidth limits for all ONUs assigned to that profile.
5. What third-party ONUs can I connect to the UFiber OLT?
The UFiber ONUs are the only supported ONU that is compatible with the UFiber OLT. Other third-party ONUs will not connect properly to the UFiber OLT.
6. What third-party OLTs can I connect to using the UFiber ONUs?
UFiber ONUs can connect to some third-party OLTs such as Huawei, Fiberhome, and ZTE. More details can be found here.
7. How far can my ONU be from my OLT?
The maximum distance from the OLT to the ONU is 20 km based on the attenuation caused by multiple sources. More details can be found in our Designing a GPON Network article.
8. Can I use ONUs as media converters without an OLT?
No, an ONU must connect to an OLT and can not connect directly to another ONU. There are other solutions to convert copper to fiber such as using a switch with both a copper and SFP ports or a copper to SFP media converter. If PoE out is required the Ubiquiti F-PoE may meet your requirements.
9. Is there a GPON SFP available?
At this time there is no GPON SFP module that can be used directly in a device. For instance, you must use a UF-Loco or UF-Nano G before the end-point device rather than inserting a GPON SFP directly into a SFP port on an EdgeRouter X SFP.
10. What if my signal is less than the recommended -28 dBm?
Unlike airMAX devices, where a poor signal gives lower bandwidth, with UFiber GPON the connection is either on with full bandwidth, or off with no bandwidth. This however, is not a hard cutoff when the signal is over -28 dBm. It is possible that a -30 dBm signal would work at full bandwidth, but we recommend always planning for at least -28 dBm.

Related Articles

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UFiber GPON - Getting Started

UFiber GPON - Accesories

UFiber GPON - Designing a GPON Network

UFiber GPON - Supported Third-Party OLTs

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