explain GPON-ONU-34-20BI vs. GPON-SFP-ONT-MAC-I

Reference for the part number change:
https://www.fs.com/products_support.html?isPica=false&categories_id=5389&third_categories_id=5607&products_model=GPON-SFP-ONT-MAC-I&style_id=15&files_id=d7725#BdUwdHTqSoLB0PxqjFzcp16Unfb

"This is solely a product part number change announcement -
functionality remains completely unaffected when using the new part
numbers."

This is not fully true, however, as other modules are sold as
GPON-SFP-ONT-MAC-I, as confirmed by discussion with fs.com account
manager. Also compare the configuration guides:

https://resource.fs.com/mall/resource/gpon-sfp-ont-mac-i-configuration-guide.pdf
(same as GPON-ONU-34-20BI--only name is changed)
https://resource.fs.com/mall/resource/gpon-sfp-ont-mac-i-configuration-guide-20260306145537.pdf
(something entirely different)

As of very recently, the part equivalent to GPON-ONU-34-20BI is no
longer sold.

Author: bugfood

_ont/ont-fs-com-gpon-onu-stick-with-mac.md

@@ -1,7 +1,7 @@
 ---
 title: FS.com GPON ONU Stick with MAC (GPON-ONU-34-20BI)
 has_children: true
-alias: SourcePhotonics SPS-34-24T-HP-TDFO
+alias: FS.com GPON-SFP-ONT-MAC-I (SKU 133619), SourcePhotonics SPS-34-24T-HP-TDFO
 parent: FS.com
 layout: default
 ---
@@ -38,8 +38,11 @@ layout: default
 
 ## Possible clones
 
+- FS.com GPON-SFP-ONT-MAC-I (SKU 133619)
 - SourcePhotonics SPS-34-24T-HP-TDFO
 
+{% include alert.html content="The GPON-SFP-ONT-MAC-I is sold as multiple SKUs; the 133619 SKU is identical to the GPON-ONU-34-20BI, but other SKUs are not the same hardware. The 133619 SKU is now no longer sold." alert="Warning" icon="svg-warning" color="yellow" %}
+
 ## Firmware is interchangeable with:
 
 - [Huawei MA5671A](/ont-huawei-ma5671a)
@@ -533,7 +536,7 @@ The FS stick stores the content of the emulated EEPROM in U-Boot env variables t
 
 # Miscellaneous Links
 
-- [FS.com](https://www.fs.com/it/products/133619.html)
+- [FS.com (no longer available)](https://www.fs.com/it/products/133619.html)
 - [General setting of lantiq](https://forum.fibra.click/d/23881-ma5671a-e-vodafone-25-gbps/64)
 - [Usage GPON module SFP in Spain](https://forum.mikrotik.com/viewtopic.php?t=116364&start=300)
 - [SourcePhotonics SPS-34-24T-HP-TDFO Datasheet](https://www.sourcephotonics.com/wp-content/uploads/2017/08/DS-8085-02_SPS-34-24T-HP-TDFO.pdf)