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+---
+date:
+  created: 2025-05-12
+draft: true
+categories:
+  - XGS-PON
+  - ADTRAN
+  - WAS-110
+  - 8311 Firmware
+  - OPNsense
+  - Better Internet Store
+  - YouFibre
+  - Netomnia
+description: Replace an ADTRAN ONT with a WAS-110 preloaded with 8311 firmware on XGS-PON
+slug: replace-adtran-ont-with-was-110
+---
+
+# Replace an ADTRAN SDX ONT with the WAS-110 on XGS-PON
+
+<!-- more -->
+<!-- nocont -->
+
+This guide outlines how to replace an **ADTRAN SDX621i** ONT on an XGS-PON line using a [WAS-110] module pre-flashed with 8311 firmware.
+
+This has been successfully tested by a user on **Netomnia / YouFibre** in the UK, who received a static IP via DHCP using a cloned MAC.
+
+---
+
+## What you need
+
+- A [WAS-110] module, pre-flashed with [8311 firmware](https://github.com/djGrrr/8311-was-110-firmware-builder)
+- Your provisioned **PON Serial Number** (from your ISP)
+- A router or firewall (e.g. OPNsense) with a VLAN-capable WAN interface (e.g. VLAN 911)
+- Optional: ability to clone MAC address (required for static IP from some ISPs)
+
+!!! note "Fiber connector"
+    The original ONT in this case was connected using **SC/APC**, which plugged directly into the WAS-110 — no patch cables or adapters were necessary.
+
+---
+
+## Configuration overview
+
+Once the WAS-110 is inserted into an SFP+ port and connected to the fiber socket:
+
+### 1. Access the 8311 web UI
+
+- Assign your computer a static IP (e.g., `192.168.11.3/24`)
+- Connect to the module directly or via switch
+- Visit: `https://192.168.11.1/cgi-bin/luci/admin/8311/config`
+
+---
+
+## 8311 Configuration
+
+### Masquerade setup
+
+To successfully masquerade on XGS-PON, the original ONT serial number and MAC is mandatory. It, along with other key
+identifiers are available on the bottom label of the ADTRAN SDX621i, shown by the arrows in the following depiction:
+
+![ADTRAN SDX621i label](masquerade-as-the-adtran-sdx621i-with-the-was-110/adtran.webp)
+
+### Configuration tab
+
+| Attribute                  | Value                        | Mandatory  | Notes                                 |
+|---------------------------|------------------------------|------------|---------------------------------------|
+| PON Serial Number (ONT ID)| From original ONT            | ✅         | Found on label of ADTRAN device       |
+| Equipment ID              | `ADTN`                       | ✅         | Matches expected ID for ADTRAN ONTs   |
+| Hardware Version          | `1.2.1b`                     |            |                                       |
+| Sync Circuit Pack Version | `1`                          |            |                                       |
+| Software Version A        | `3.7.4-2306.5`               | ✅         | Confirmed working version             |
+| Software Version B        | `3.7.4-2306.5`               | ✅         | Matches A                             |
+| MIB File                  | `/etc/mibs/prx300_1U.ini`    | ✅         | Note: use `1U`, not `1V`, for VEIP    |
+| MAC Address               | Cloned from original ONT     | ✅         | Required for static IP on some ISPs   |
+
+---
+
+## Real-world example
+
+A UK-based user successfully replaced their **ADTRAN SDX621i** on **YouFibre (Netomnia)** using a WAS-110 from the [Better Internet Store].
+
+### Observations:
+
+> PLOAM state reached **O5.1 (Associated)**, but no WAN IP was received until:
+>
+> - `Fix VLANs` was disabled
+> - OPNsense was rebooted
+>
+> The 8311 UI became unreachable after assigning it to the WAN VLAN — a static route attempt was unsuccessful. For ongoing access, it's best to configure the ONT before attaching it to your WAN.
+
+---
+
+## Performance
+
+Reported speeds were slightly improved:
+
+> On a 1 Gbps symmetric connection, speed tests showed a 50 Mbps improvement. More importantly, space was freed in the network cabinet by removing the external ONT.
+
+---
+
+## Resources
+
+- [WAS-110 Documentation](../xgs-pon/ont/bfw-solutions/was-110.md)
+- [Troubleshooting fake O5](../guides/troubleshoot-connectivity-issues-with-the-was-110.md#fake-o5)
+- [8311 Firmware Builder on GitHub](https://github.com/djGrrr/8311-was-110-firmware-builder)
+
+---
+
+## Thanks
+
+Thanks to [Better Internet Store](https://www.betterinternet.ltd) for supplying the pre-flashed module and to the 8311 community for collective testing efforts.
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