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

Tear down

Hint The GPON-SN on the sticker is not the same as you get from Get GPON serial number!

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!

Get GPON serial number

Connect via SSH (as admin):

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

ssh -o HostKeyAlgorithms=+ssh-rsa admin@192.168.0.1

Hint 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.

Serial

Follow the procedure in tear down to open the case, then connect a USB-TTL adapter to the pin header:

Hint Some USB-TTL adapters label Tx and Rx pins the other way around; try to swap them if the connection doesn’t work.

Baudrate: 115200 8n1