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---
title: Zyxel PMG3000-D20B
has_children: false
alias: Ziza OP151S, T&W TW2362H-CDEL
layout: default
parent: Zyxel
---
# Hardware Specifications
| | |
| ----------- | ----------------------------------------------- |
| Vendor | Zyxel |
| Model | PMG3000-D20B |
| Chipset | Lantiq PEB98035 |
| Flash | 8 MB |
| RAM | 64 MB |
| System | OpenWRT |
| HSGMII | Yes |
| Optics | SC/APC |
| IP address | 10.10.1.1 |
| Web Gui | ✅ username `admin` or `guest`, password `1234` or `guest` |
| SSH | ✅ username `admin`, password `admin` |
| Form Factor | miniONT SFP |
{% include image.html file="pmg3000-d20b.png" alt="PMG3000-D20B" caption="PMG3000-D20B" %}
{% include image.html file="op151s.png" alt="Ziza OP151S" caption="Ziza OP151S" %}
Once you access the stick via ssh you will be presented with a second tier login. The credentials to access the zyxel shell are: username: `twmanu` , password: `twmanu`.
From the Zyxel shell you can move to a standard Linux shell using the `linuxshell` command
## Firmware is interchangeable with:
- [Halny HL-GSFP](/ont-halny-hl-gsfp)
- [D-LINK DPN-100-Rev-A2](/ont-d-link-dpn-100-rev-a2)
- [Ziza OP151s](/ont-ziza-op151s)
- [T&W TW2362H-CDEL](/ont-t-w-tw2362h-cdel)
# List of software versions
# List of partitions
| dev | size | erasesize | name |
| ---- | -------- | --------- | -------------- |
| mtd0 | 00060000 | 00010000 | "Boot" |
| mtd1 | 00010000 | 00010000 | "Env" |
| mtd2 | 00390000 | 00010000 | "ImageA" |
| mtd3 | 00390000 | 00010000 | "ImageB" |
| mtd4 | 00060000 | 00010000 | "Config" |
| mtd5 | 00010000 | 00010000 | "SECTION_EGIS" |
| mtd6 | 00250000 | 00010000 | "rootfs" |
| mtd7 | 00020000 | 00010000 | "rootfs_data" |
This stick supports dual boot, as visible from the presence of `ImageA` and `ImageB`, which contain the rootfs.
# List of firmwares and files
## Useful files
- `/var/config/ont.sys` - Used to customize various settings on the stick. If you don't have it you can copy the stock one from /ont.sys
# Useful Commands
{% include alert.html content="All commands start from the twmanu shell." alert="Note" icon="svg-info" color="blue" %}
## Changing the ONT's S/N
{% include alert.html content="The S/N is stored in the ASCII format." alert="Note" icon="svg-info" color="blue" %}
```sh
manufactory
set sn ALCLf0f0f0f0
exit
hal
set sn ALCLf0f0f0f0
```
## Changing the ONT's PLOAM password
{% include alert.html content="The PLOAM password is stored in the ASCII format." alert="Note" icon="svg-info" color="blue" %}
This can be done easily via web ui. If you prefer to do it via the shell use:
```sh
hal
set password PLOAMPASS
```
## Changing the ONT's equipment ID
{% include alert.html content="Model number must not be more than 20 characters long in total." alert="Note" icon="svg-info" color="blue" %}
```sh
manufactory
set equipment id MYEQUIPMENTID
exit
omci
equipment id MYEQUIPMENTID
```
## Changing the ONT's hardware version
```sh
manufactory
set hardware version 3FE49165BFAA01
```
## Changing the software version
Edit the /var/config/ont.sys via vi directly on the stick itself. The file is CRLF terminated, one entry per line.
The entries for the software version are:
```
SW_VER0:0xabcdef
SW_VER1:0xabcedf
```
{% include alert.html content="It's better to enter the software version in hex format, all lowercase precedeed by 0x." alert="Note" icon="svg-info" color="blue" %}
## See link speed
This SFP has HSGMII enabled by default: `link_status=5` for HSGMII 2.5Gbit, `link_status=4` for SGMII 1Gbit:
```
linuxshell
onu lanpsg 0
```
## Checking connection state
To see the connection state use the following command:
```
linuxshell
onu ploamsg
```
`curr_state=5` for O5 state, `curr_state=1` for all other operational states.
## Querying a particular OMCI ME
Query via OMCI ME Class Name
```sh
omci
show me classname OmciClassName (e.g Ont2g)
```
Query via OMCI ME ID
```sh
omci
show me classid OmciClassId (e.g 7)
```
# Low Level Modding
## Creating a new rootfs
The stick has a tricky image packing method, fortunately it has been reverse engineered. A script to help you create a custom rootfs can be found here: [https://github.com/nanomad/zyxel-pmg-3000-mod-kit](https://github.com/nanomad/zyxel-pmg-3000-mod-kit)
## Flashing a new rootfs
{% include alert.html content="All commands start from the twmanu shell." alert="Note" icon="svg-info" color="blue" %}
- Transfer the new mtd on the stick via tftp
```
linuxshell
tftp -gr mtd2.mod.bin TFTP_SERVER_IP
```
- Flash it on the standby partition.
You can use `system` and then `show actimage` to get the current active image. Check `/proc/mtd` for the right mtds. Usually:
- if the currect active image is A the mtd in use is mtd2
- If the current active image is B the mtd in use is mtd3
```
linuxshell
mtd -e /dev/mtd2 write /tmp/mtd2.mod.bin /dev/mtd2
```
- Switch to the new image
```
system
set actimage a
```
- Reboot the ONT
```
system
reboot
```
# Reset Web Gui admin credentials
Sometimes, under certain circumstances, the Web Gui admin credentials might get changed from the default `admin`/`1234` combination.
To restore the default combination you can try following [this method](https://github.com/xvzf/zyxel-gpon-sfp/issues/6#issuecomment-1065864650).
# Known Bugs
- [Not working with Broadcom BCM57810S](https://github.com/xvzf/zyxel-gpon-sfp/issues/10)
- Issue on IPv6 discovery. But we are not sure if is a edge case of a particular ISP or not
- [Some sticks have a custom password](https://github.com/xvzf/zyxel-gpon-sfp/issues/6)
# Miscellaneous Links
- [zyxel gpon- sfp](https://github.com/xvzf/zyxel-gpon-sfp)
- [zyxel pmg-3000 mod kit](https://github.com/nanomad/zyxel-pmg-3000-mod-kit)
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