Hardware Specifications
| Vendor/Brand | Adtran |
| Model | SDX 621i |
| Part Number | 1287844F1 |
| Chipset | |
| Flash | |
| RAM | |
| System | |
| Standard | XGS-PON (ITU-T G.9807.1) |
| Management | OMCI (ITU-T G.988) |
| Ethernet | 1x 1GbE RJ-45 |
| 2.5GBaseT | No |
| Optics | SC/APC |
| IP address | |
| Web Gui | |
| SSH | |
| Telnet | |
| Serial | |
| Serial baud | |
| Serial encoding | |
| Form Factor | ONT |
| Weight | 1.15 lbs (~520 g) |
| Dimensions | 10" x 6.25" x 2.75" (254 x 159 x 70 mm) |
The SDX 621i is the 1GbE variant of the Adtran 621 family of XGS-PON single family unit (SFU) ONTs. It supports remote activation/deactivation, remote firmware upgrades/downgrades and remote OMCI management.