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+---
+title: Zyxel PM7300-T0
+has_children: false
+layout: default
+parent: Zyxel
+---
+
+# Hardware Specifications
+
+|              |                                        |
+| ------------ | -------------------------------------- |
+| Vendor/Brand | Zyxel                                  |
+| Model        | PM7300-T0                              |
+| Chipset      | MediaTek/EcoNet EN7580                 |
+| Flash        | 128 MiB SPI NAND (Macronix MXIC35LF1G) |
+| RAM          | 256 MiB                                |
+| 10GBaseT     | ✅ 1 ×                      |
+| Optics       | SC/APC                                 |
+| IP address   | 192.168.0.1/24                         |
+| Web Gui      | ✅ port 80/443                         |
+| SSH          | ✅ port 22                             |
+| Telnet       | ✅ port 23                             |
+| FTP          | ✅ port 21                             |
+| Serial       | ✅ (TTL 3.3V @ 115200,8n1)             |
+| Form Factor  | ONT                                    |
+
+{% include image.html file="zyxel-pm7300/ports.jpg" alt="Zyxel PM7300-T0 ports" caption="Zyxel PM7300-T0 ports" %}
+
+
+## Tear down
+
+{% include image.html file="zyxel-pm7300/bottom.jpg" alt="Zyxel PM7300-T0 bottom" caption="Zyxel PM7300-T0 bottom" %}
+
+{% include alert.html content="The GPON-SN on the sticker is not the same as you get from [Get GPON serial number](#get-gpon-serial-number)!" alert="Hint" icon="svg-info" color="grey" %}
+
+Unscrew the screws beneath the two encircled rubber feet.
+Then slide a plastic spudger/pry/case opening tool around to separate the top half from the bottom half of the case.
+Pay attention that the board does not fall out when the case splits!
+
+{% include image.html file="zyxel-pm7300/board_top.jpg" alt="Zyxel PM7300-T0 board" caption="Zyxel PM7300-T0 board" %}
+{% include image.html file="zyxel-pm7300/board_bottom.jpg" alt="Zyxel PM7300-T0 board (bottom side)" caption="Zyxel PM7300-T0 board (bottom side)" %}
+
+
+## Get GPON serial number
+
+Connect via SSH (as admin):
+
+```console
+ZySH> sys atsh
+Firmware Version       : V5.42(ABYY.1.3)C0
+Bootbase Version       : V1.44 | 04/12/2023  9:18:33
+Vendor Name            : Zyxel Communications Corp.
+Product Model          : PM7300-T0
+Serial Number          : S230YNNNNNNNN
+GPON Serial Number     : ZYXE8CAXXXXX
+...
+```
+
+Alternatively, the command `ATSH` in the zloader bootloader can be used.
+
+## SSH
+
+```sh
+ssh -o HostKeyAlgorithms=+ssh-rsa admin@192.168.0.1
+```
+
+{% include alert.html content="The device only presents SSH host keys using SHA1 which is not accepted anymore since OpenSSH 8.8. If the connection fails add `-o HostKeyAlgorithms=+ssh-rsa`. Other SSH clients may behave similarly." alert="Hint" icon="svg-info" color="grey" %}
+
+
+## Serial
+
+Follow the procedure in [tear down](#tear-down) to open the case, then connect a USB-TTL adapter to the pin header:
+
+{% include image.html file="zyxel-pm7300/UART.jpg" alt="Zyxel PM7300-T0 UART pins" %}
+
+{% include alert.html content="Some USB-TTL adapters label Tx and Rx pins the other way around; try to swap them if the connection doesn't work." alert="Hint" icon="svg-warning" color="yellow" %}
+
+**Baudrate:** 115200 8n1
diff --git a/_ont_xgs/ont-zyxel.md b/_ont_xgs/ont-zyxel.md
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+---
+title: Zyxel
+has_children: true
+layout: default
+---
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