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menuUF-OLT-4 Quick Start Guide

Package Contents

UFiber OLT-4
SC/UPC GPON SFP Transceiver (UF‑GP‑B+)
Mounting Brackets (Qty. 2)
Bracket Screws (Qty. 8)
Mounting Screws (Qty. 4)
Cage Nuts (Qty. 4)
Power Cord
Rubber Feet (Qty. 4)

System Requirements

Installation Requirements

Before You Begin

Designing your first GPON deployment requires specific knowledge and planning. For information on GPON network design and installation, including important considerations and best practices, refer to:

For details on configuring UFiber devices for the first time to allow ONU LAN ports to provide connectivity, refer to: ubnt.link/UFiber-Initial-Configuration

Hardware Overview

System LED


Initializing/Booting Up


Ready for Use

PON LED (Ports 1 - 4)


No Link


GPON Link/Activity

SFP+ LED (Port 1)


No Link


1G Link/Activity


10G Link/Activity



No Link


10/100 Link/Activity


1000 Link/Activity

GPON (Ports (PON 1- 4)

Gigabit Passive Optical Network ports support up to 128 clients on each port.

SFP+ (Port 1)

Hot-swappable SFP+ port supports 1G or 10G connections.


10/100/1000 Ethernet port used for out‑of‑band management. For firmware version 4.1 and newer, it is set to DHCP Client with the fallback IP address,

Note: Previous firmware versions default to a static IP:

Console Port

RJ45 serial console port for Command Line Interface (CLI) management. Use an RJ45-to-DB9, serial console cable, also known as a rollover cable, to connect the Console port to your computer. (If your computer does not have a DB9 port, then you will also need a DB9 adapter.) Then configure the following settings as needed:

  • Baud rate 57600
  • Data bits 8
  • Parity NONE
  • Stop bits 1
  • Flow control NONE

USB Port

Reserved for future use.

Reset Button

There are two methods to reset the device to factory defaults:

  • Runtime reset (recommended) The device should be running after bootup is complete. Press and hold the Reset button for about 10 seconds until the MGMT LED starts flashing and then becomes solidly lit. After a few seconds, the LED will turn off, and the device will automatically reboot.
  • Note: To press the Reset button, insert a straightened paper clip (or similar object) into the hole shown above. Do not use an object that can break and become lodged in the hole.

  • Power-on reset Disconnect power from the device. Press and hold the Reset button while connecting power to the device. Keep holding the button until the MGMT LED starts flashing and then stops flashing after a few seconds.

DC Power Jack

The 24VDC input can connect a redundant or stand-alone DC power source (not included) with minimum power: 56W, 25 to 16V, and 2.5 mm DC power inline connector.

Note: You can use the redundant DC power source as a hot spare; if the internal AC/DC power supply no longer provides power, then the device will switch to the DC power source without interrupting its operation.


Connect the included Power Cord to the Power port.

Hardware Installation


  2. OR

Connecting a PON Module

WARNING: Never look directly into the ends of fiber or modules. The emitted light could cause damage to the eye.

WARNING: Until ready for use, keep modules and fiber patch cables covered using the included protective caps to ensure the connections stay clean.

Note: One GPON SFP transceiver (model UF-GP-B+) is included. Use a compatible PON SFP transceiver with the appropriate fiber optic cabling for each PON port. For information on compatible fiber transceivers, visit: ubnt.link/UFiber-OLT-Modules

Connecting SFP+

Accessing the Configuration Interface

The following instructions apply to firmware version 4.1 and newer.

Note: Previous firmware versions default to a static IP:

  1. Connect an Ethernet cable from the MGMT port on the device to a LAN segment that has an existing DHCP server.

  2. To check the IP address of the device, use one of the following methods:
    • Set up the DHCP server to provide a specific IP address to the device based on its MAC address (on the label).
    • Let the device obtain an IP address and then check the DHCP server to see which IP address was assigned.
  3. Launch your web browser. Enter the appropriate IP address in the address field. Press enter (PC) or return (Mac).
  4. Enter ubnt in the Username and Password fields. Click Login.

Customize settings as needed. For more information, refer to the UFiber resources, which are available at: http://ubnt.link/UFiber-Support




299.80 x 258.95 x 42.55 mm
(11.8 x 10.2 x 1.7")



Without Mount Brackets 1.93 kg (4.25 lb)
With Mount Brackets 2.13 kg (4.70 lb)

Max. Power Consumption

35W (Excluding SFP Transceivers)

Power Method

110 - 240VAC Modular Port

Power Supply

AC/DC Internal 56W DC

Supported Voltage Range

100 - 240VAC; 16-25VDC




MIPS 1004Kc 880 MHz Dual-Core

System Memory

512 MB DDR3, 512 MB NAND



System Status
PON Data Ports Link/Activity
SFP+ Data Ports Link/Activity
RJ45 (MGMT) Port Link/Activity


Data Ports

(1) 1G/10G SFP+ Ports

Management Port (1) RJ45 Ethernet Port
Serial Console Port

(1) RJ45 Serial Port



Operating Temperature

-10 to 45° C (14 to 113° F)

Operating Humidity

10 - 90% Noncondensing



GPON SFP OLT Transceiver

Single Fiber, SM SC/UPC, 20 km,

1490 nm TX/1310 nm RX,

ITU-T G984.2 Class B+