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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).
## EEPROM (I2C slave simulated EEPROM)
The Zyxel PMG3000-D20B does not have a physical EEPROM, the Falcon SOC emulates an EEPROM by exposing it on the I2C interface as required by the SFF-8472 specification.
On the I2C interface there will be two memories of 256 bytes each at the addresses `1010000X (A0h)` and `1010001X (A2h)`.
The Zyxel PMG3000-D20B stores the content of the emulated EEPROM1 (A2h) in `/tmp/config/sfp_eeprom1` to restore it after a reboot.
{% include alert.html content="The contents of EEPROM0 (A0h) are not stored anywhere and is regenerated at each boot" alert="Info" icon="svg-info" color="blue" %}
### EEPROM0 layout
| address | size | name | default value | description |
| --------- | -------- | --------------------------------- | ------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------- |
| | | **BASE ID FIELDS (SFF-8472)** | | |
| 0 | 1 | Identifier | `0x03` (SFP) | Type of transceiver |
| 1 | 1 | Ext identifier | `0x04` (MOD_DEF 4) | Additional information about the transceiver |
| 2 | 1 | Connector | `0x01` (SC) | Type of media connector |
| 3-10 | 8 | Transceiver | `0x04 0x40 0x00 0x02 0x12 0x10 0x00 0x80` (1X LX, 1310TX SMF, 1000BASE-LX, 1200 Mbps) | Code for optical compatibility |
| 11 | 1 | Encoding | `0x03` (8B/10B) | High speed serial encoding algorithm |
| 12 | 1 | Signaling Rate, Nominal | `0x0C` (1Gbps) | Nominal signaling rate |
| 13 | 1 | Rate Identifier | `0x00` (Not used) | Type of rate select functionality |
| 14 | 1 | Length (SMF,km) | `0x14` (20 km) | Link length supported for single-mode fiber, units of km |
| 15 | 1 | Length (SMF) | `0xC8` (200 x 100m) | Link length supported for single-mode fiber, units of 100 m |
| 16 | 1 | Length (50 um, OM2) | `0xFF` (No support) | Link length supported for 50 um OM2 fiber, units of 10 m |
| 17 | 1 | Length (62.5 um, OM1) | `0xFF` (No support) | Link length supported for 62.5 um OM1 fiber, units of 10 m |
| 18 | 1 | Length copper cable | `0x00` (No support) | Link length supported for copper or direct attach cable, units of m |
| 19 | 1 | Length (50 um, OM3) | `0xFF` (No support) | Link length supported for 50 um OM3 fiber, units of 10 m |
| 20-35 | 16 | Vendor name | `0x4C 0x61 0x6E 0x74 0x69 0x71 0x20 0x20 0x20 0x20 0x20 0x20 0x20 0x20 0x20 0x20` (Lantiq) | SFP vendor name (ASCII) |
| 36 | 1 | Transceiver | `0x00` (No support) | Code for optical compatibility |
| 37-39 | 3 | Vendor OUI | `0x00 0x1C 0xAD` | SFP vendor IEEE company ID |
| 40-55 | 16 | Vendor PN | `0x50 0x61 0x72 0x74 0x20 0x4E 0x75 0x6D 0x62 0x65 0x72 0x20 0x20 0x20 0x20 0x20` (Part Number) | Part number provided by SFP vendor (ASCII) |
| 56-59 | 4 | Vendor rev | `0x30 0x30 0x30 0x30` (0000) | Revision level for part number provided by vendor (ASCII) |
| 60-61 | 2 | Wavelength | `0x05 0x1E` (1310nm TX) | Laser wavelength |
| 62 | 1 | Fibre Channel Speed 2 | `0xFF` (No support) | Transceiver's Fibre Channel speed capabilities |
| 63 | 1 | CC_BASE | | Check code for Base ID Fields (addresses 0 to 62) |
| | | **EXTENDED ID FIELDS (SFF-8472)** | | |
| 64-65 | 2 | Options | `0x00 0x1A` (TX DISABLE, TX FAULT, RX LOS) | Indicates which optional transceiver signals are implemented |
| 66 | 1 | Signaling Rate, max | `0x00` (No specified) | Upper signaling rate margin, units of % |
| 67 | 1 | Signaling Rate, min | `0x00` (No specified) | Lower signaling rate margin, units of % |
| 68-83 | 16 | Vendor SN | `0x6E 0x6F 0x20 0x73 0x65 0x72 0x69 0x61 0x6C 0x20 0x6E 0x75 0x6D 0x62 0x65 0x72` (no serial number) | Serial number provided by vendor (ASCII) |
| 84-91 | 8 | Date code | `0x31 0x33 0x30 0x31 0x30 0x31 0x20 0x20` (130101) | Vendor's manufacturing date code |
| 92 | 1 | Diagnostic Monitoring Type | `0x6C` (Digital diagnostic, Internally calibrated, Received average power type, address change) | Indicates which type of diagnostic monitoring is implemented |
| 93 | 1 | Enhanced Options | `0xF0` (Alarm/warning flags, soft TX_DISABLE control, soft TX_FAULT monitoring, soft RX_LOS monitoring) | Indicates which optional enhanced features are implemented |
| 94 | 1 | SFF-8472 Compliance | `0x05` (Rev 11.0 of SFF-8472) | Indicates which revision of SFF-8472 the transceiver complies with |
| 95 | 1 | CC_EXT | | Check code for the Extended ID Fields (addresses 64 to 94) |
| | | **VENDOR SPECIFIC FIELDS** | | |
| 96-127 | 32 | Vendor data | `0x20 0x20 0x20...` (Not used) | Vendor specifc data (ASCII) |
| 128-255 | 128 | Reserved | `0x00 0x00 0x00...` | Reserved |
### EEPROM1 layout
| address | size | name | default value | description |
| --------- | -------- | --------------------------------- | ------------------------------------------------------------------------------------------- | ------------------------------------------------------------------- |
| | | **DIAGNOSTIC AND CONTROL FIELDS** | | |
| 0-1 | 2 | Temp High Alarm | `0x64 0x00` (100℃) | |
| 2-3 | 2 | Temp Low Alarm | `0xCE 0x00` (-50℃) | |
| 4-5 | 2 | Temp High Warning | `0x55 0x00` (85℃) | |
| 6-7 | 2 | Temp Low Warning | `0xD8 0x00` (-40℃) | |
| 8-9 | 2 | Voltage High Alarm | `0x8C 0xA0` (3.6V) | |
| 10-11 | 2 | Voltage Low Alarm | `0x75 0x30` (3.0V) | |
| 12-13 | 2 | Voltage High Warning | `0x88 0xB8` (3.5V) | |
| 14-15 | 2 | Voltage Low Warning | `0x79 0x18` (3.1V) | |
| 16-17 | 2 | Bias High Alarm | `0xAF 0xC8` (90mA) | |
| 18-19 | 2 | Bias Low Alarm | `0x00 0x00` (0mA) | |
| 20-21 | 2 | Bias High Warning | `0x88 0xB8` (70mA) | |
| 22-23 | 2 | Bias Low Warning | `0x00 0x00` (0mA) | |
| 24-25 | 2 | TX Power High Alarm | `0x7B 0x86` (5dBm) | Value expressed in watts subunits |
| 26-27 | 2 | TX Power Low Alarm | `0x27 0x10` (0dBm) | Value expressed in watts subunits |
| 28-29 | 2 | TX Power High Warning | `0x6E 0x17` (4dBm) | Value expressed in watts subunits |
| 30-31 | 2 | TX Power Low Warning | `0x2B 0xD4` (0.1dBm) | Value expressed in watts subunits |
| 32-33 | 2 | RX Power High Alarm | `0x07 0xCB` (-7dBm) | Value expressed in watts subunits |
| 34-35 | 2 | RX Power Low Alarm | `0x00 0x0F` (-28dBm) | Value expressed in watts subunits |
| 36-37 | 2 | RX Power High Warning | `0x06 0x30` (-8dBm) | Value expressed in watts subunits |
| 38-39 | 2 | RX Power Low Warning | `0x00 0x14` (-27dBm) | Value expressed in watts subunits |
| 40-55 | 16 | Reserved | `0x00 0x00 0x00...` | Contains the mac address of the SFP, it could also be empty |
| 56-59 | 4 | RX_PWR(4) Calibration | `0x00 0x00 0x00 0x00` | 4th order RSSI calibration coefficient |
| 60-63 | 4 | RX_PWR(3) Calibration | `0x00 0x00 0x00 0x00` | 3rd order RSSI calibration coefficient |
| 64-67 | 4 | RX_PWR(2) Calibration | `0x00 0x00 0x00 0x00` | 2nd order RSSI calibration coefficient |
| 68-71 | 4 | RX_PWR(1) Calibration | `0x00 0x00 0x00 0x00` | 1st order RSSI calibration coefficient |
| 72-75 | 4 | RX_PWR(0) Calibration | `0x00 0x00 0x00 0x00` | 0th order RSSI calibration coefficient |
| 76-77 | 2 | TX_I(Slope) Calibration | `0x00 0x00` | Slope for Bias calibration |
| 78-79 | 2 | TX_I(Offset) Calibration | `0x00 0x00` | Offset for Bias calibration |
| 80-81 | 2 | TX_PWR(Slope) Calibration | `0x00 0x00` | Slope for TX Power calibration |
| 82-83 | 2 | TX_PWR(Offset) Calibration | `0x00 0x00` | Offset for TX Power calibration |
| 84-85 | 2 | T(Slope) Calibration | `0x00 0x00` | Slope for Temperature calibration |
| 86-87 | 2 | T(Offset) Calibration | `0x00 0x00` | Offset for Temperature calibration, in units of 256ths °C |
| 88-89 | 2 | V(Slope) Calibration | `0x00 0x00` | Slope for VCC calibration |
| 90-91 | 2 | V(Offset) Calibration | `0x00 0x00` | Offset for VCC calibration |
| 92-94 | 3 | Reserved | `0x00 0x00 0x00` | Reserved |
| 95 | 1 | CC_DMI | | Check code for Base Diagnostic Fields (addresses 0 to 94) |
| 96 | 1 | Temperature MSB | | Internally measured module temperature |
| 97 | 1 | Temperature LSB | | |
| 98 | 1 | Vcc MSB | | Internally measured supply voltage in transceiver |
| 99 | 1 | Vcc LSB | | |
| 100 | 1 | TX Bias MSB | | Internally measured TX Bias Current |
| 101 | 1 | TX Bias LSB | | |
| 102 | 1 | TX Power MSB | | Measured TX output power |
| 103 | 1 | TX Power LSB | | |
| 104 | 1 | RX Power MSB | | Measured RX input power |
| 105 | 1 | RX Power LSB | | |
| 106-109 | 4 | Optional Diagnostics | `0x00 0x00 0x00 0x00` (No support) | Monitor Data for Optional Laser temperature and TEC current |
| 110 | 1 | Status/Control | `0x02` (Digital RX LOS) | Optional Status and Control Bits |
| 111 | 1 | Reserved | `0x00` | Reserved |
| 112-113 | 2 | Alarm Flags | `0x01 0x40` | Diagnostic Alarm Flag Status Bits |
| 114 | 1 | Tx Input EQ control | `0x00` (No support) | Tx Input equalization level control |
| 115 | 1 | Rx Out Emphasis control | `0x00` (No support) | Rx Output emphasis level control |
| 116-117 | 2 | Warning Flags | `0x01 0x40` | Diagnostic Warning Flag Status Bits |
| 118-119 | 2 | Ext Status/Control | `0x00 0x00` (No support) | Extended module control and status bytes |
| | | **GENERAL USE FIELDS** | | |
| 120-126 | 7 | Vendor Specific | `0x00 0x00 0x00 0x00 0x00 0x00 0x00` | Vendor specific memory addresses |
| 127 | 1 | Table Select | `0x00` | Optional Page Select |
| | | **USER WRITABLE EEPROM** | | |
| 128-232 | 105 | Reserved | `0x00 0x00 0x00...` | Reserved |
| 233-240 | 8 | GPON SN | Unique in each SFP | GPON Serial Number (ME 256) |
| 241-247 | 7 | Reserved | `0x00 0x00 0x00...` | Reserved |
| 248-255 | 8 | Vendor Control | `0x00 0x00 0x00...` (Not used) | Vendor specific control functions |
{% include alert.html content="For more information, see the SFF-8472 Rev 11.0 specification." alert="Info" icon="svg-info" color="blue" %}
# 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)
|
