path: root/_ont/ont-zyxel-pmg3000-d20b.md

---
title: Zyxel PMG3000-D20B
has_children: false
layout: default
parent: Zyxel
---

# Hardware Specifications

|                  |                                                            |
| ---------------- | ---------------------------------------------------------- |
| Vendor/Brand     | Zyxel                                                      |
| Model            | PMG3000-D20B                                               |
| ODM              | T&W                                                        |
| ODM Product Code | TW2362H-CDEL                                               |
| Chipset          | Lantiq PEB98035                                            |
| Flash            | 8 MB                                                       |
| RAM              | 64 MB                                                      |
| CPU              | MIPS 34Kc interAptiv                                       |
| CPU Clock        | 400MHz                                                     |
| System           | eCoS                                                       |
| 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`                      |
| Telnet           |                                                            |
| Serial           | ✅                                                         |
| Serial baud      | 115200                                                     |
| Serial encoding  | 8-N-1                                                      |
| Form Factor      | miniONT SFP                                                |

{% include image.html file="pmg3000-d20b.png" alt="PMG3000-D20B" caption="PMG3000-D20B" %}
{% include image.html file="tw236h-cdel-th.jpg" alt="PMG3000-D20B Teardown" caption="PMG3000-D20B Teardown" %}
{% include image.html file="tw236h-cdel-th-back.jpg" alt="PMG3000-D20B Teardown" caption="PMG3000-D20B Teardown" %}

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

## Serial

The stick has a TTL 3.3v UART console (configured as 115200 8-N-1) that can be accessed from the top surface. It's near the SFP header. TX, RX and ground pads need to be connected to a USB2TTL adapter supporting 3V3 logic.

{% include image.html file="tw236h-cdel-serial.jpg" alt="PMG3000-D20B Serial Pinout" caption="PMG3000-D20B Serial Pinout" %}

{% 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="Note"  icon="svg-warning" color="yellow" %}

## 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
- V1.00(ABVJ.0)b3s (2020)
- V1.00(ABVJ.0)b3i (2020)
- V2.50(ABVJ.0)b1b (2022)
- V2.50(ABVJ.1)b1d (2023)

## 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.


# Useful files and binaries

## 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

# General Settings and Useful Commands
{% include alert.html content="All commands start from the twmanu shell." alert="Note"  icon="svg-info" color="blue" %}

# GPON ONU status

## Getting the operational status of the ONU
To check the connection status, use the following command:
```
linuxshell
onu ploamsg
```

`curr_state=5` for O5 state, `curr_state=1` for all other operational states.

## Getting Speed LAN Mode
This SFP has HSGMII enabled by default: `link_status=5` for HSGMII 2.5Gbit, `link_status=4` for SGMII 1Gbit:
```
linuxshell
onu lanpsg 0
```

## Setting Speed LAN Mode
{% include alert.html content="This command forces the speed to 2.5 and is instantaneous and permanent, use it only if your hardware supports HSGMII and is compatible (e.g. modified Broadcom 57810s NIC)" alert="Note" icon="svg-warning" color="red" %}
```sh
hal
set speed 2.5g mode full
```

## 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)
```

# GPON/OMCI settings

## Setting ONU GPON Serial Number
{% 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
```
Do not worry if one of the two commands results missing, the change is still applied with just one of them.

## Setting ONU GPON 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 the web UI. To do it via the shell use:
```sh
hal
set password PLOAMPASS
```

## Setting OMCI software version (ME 7)
Edit `/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" %}

## Setting OMCI hardware version (ME 256)
```sh
manufactory
set hardware version 3FE49165BFAA01
```

If the above command is missing you can edit `/var/config/ont.sys` via vi directly on the stick itself. The file is CRLF terminated, one entry per line.
The entry for the hardware version is:
```
ONTG_VER:0x463630303556362e300000000000
```

The hardware version must be encoded in hex format and right padded to 28 characters with 0 (excluding the starting 0x) to avoid any spurious values. 

## Setting OMCI equipment ID (ME 257)
{% include alert.html content="Model number must not be longer than 20 characters in total." alert="Note"  icon="svg-info" color="blue" %}
```sh
manufactory
set equipment id MYEQUIPMENTID
exit
omci
equipment id MYEQUIPMENTID
```

If any of the above commands is missing you can edit `/var/config/ont.sys` via vi directly on the stick itself. The file is CRLF terminated, one entry per line.
The entry for the equipment id is:
```
ONTG_EQID:0x463630303556362E30000000000000000000000
```

The equipment id must be encoded in hex format and right padded to 39 characters with 0 (excluding the starting 0x) to avoid any spurious values. 


# Advanced settings

## Resetting Web GUI admin credentials

Under certain circumstances, the Web GUI admin credentials might get changed from the default `admin`/`1234` combination.
To restore the default combination try following [this method](https://github.com/xvzf/zyxel-gpon-sfp/issues/6#issuecomment-1065864650).

## 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, mtd2 is in use
- If the current active image is B, mtd3 is in use
```
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
```

# 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, two memories of 256 bytes each will be available 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 they're 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℃)                   | Value expressed in two's complement                         |
| 2-3     | 2    | Temp Low Alarm                    | `0xCE 0x00` (-50℃)                   | Value expressed in two's complement                         |
| 4-5     | 2    | Temp High Warning                 | `0x55 0x00` (85℃)                    | Value expressed in two's complement                         |
| 6-7     | 2    | Temp Low Warning                  | `0xD8 0x00` (-40℃)                   | Value expressed in two's complement                         |
| 8-9     | 2    | Voltage High Alarm                | `0x8C 0xA0` (3.6V)                   | Value expressed in volt subunits[^subunit]                  |
| 10-11   | 2    | Voltage Low Alarm                 | `0x75 0x30` (3.0V)                   | Value expressed in volt subunits[^subunit]                  |
| 12-13   | 2    | Voltage High Warning              | `0x88 0xB8` (3.5V)                   | Value expressed in volt subunits[^subunit]                  |
| 14-15   | 2    | Voltage Low Warning               | `0x79 0x18` (3.1V)                   | Value expressed in volt subunits[^subunit]                  |
| 16-17   | 2    | Bias High Alarm                   | `0xAF 0xC8` (90mA)                   | Value expressed in milliampere subunits[^subunit]           |
| 18-19   | 2    | Bias Low Alarm                    | `0x00 0x00` (0mA)                    | Value expressed in milliampere subunits[^subunit]           |
| 20-21   | 2    | Bias High Warning                 | `0x88 0xB8` (70mA)                   | Value expressed in milliampere subunits[^subunit]           |
| 22-23   | 2    | Bias Low Warning                  | `0x00 0x00` (0mA)                    | Value expressed in milliampere subunits[^subunit]           |
| 24-25   | 2    | TX Power High Alarm               | `0x7B 0x86` (5dBm)                   | Value expressed in watts subunits[^subunit]                 |
| 26-27   | 2    | TX Power Low Alarm                | `0x27 0x10` (0dBm)                   | Value expressed in watts subunits[^subunit]                 |
| 28-29   | 2    | TX Power High Warning             | `0x6E 0x17` (4dBm)                   | Value expressed in watts subunits[^subunit]                 |
| 30-31   | 2    | TX Power Low Warning              | `0x2B 0xD4` (0.1dBm)                 | Value expressed in watts subunits[^subunit]                 |
| 32-33   | 2    | RX Power High Alarm               | `0x07 0xCB` (-7dBm)                  | Value expressed in watts subunits[^subunit]                 |
| 34-35   | 2    | RX Power Low Alarm                | `0x00 0x0F` (-28dBm)                 | Value expressed in watts subunits[^subunit]                 |
| 36-37   | 2    | RX Power High Warning             | `0x06 0x30` (-8dBm)                  | Value expressed in watts subunits[^subunit]                 |
| 38-39   | 2    | RX Power Low Warning              | `0x00 0x14` (-27dBm)                 | Value expressed in watts subunits[^subunit]                 |
| 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                       | Supported                            | 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                     | Supported                            | 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
- [Works with Broadcom BCM57810S only after solder mod](https://github.com/xvzf/zyxel-gpon-sfp/issues/10)
- Issue on IPv6 discovery. Not certain whether it 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)
- On V2.5 the Lantiq SDK has been updated from 6.4.2 to 7.5.1, breaking upload performance

# 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)
- [Rollback SFP Zyxel con il W3 HUB per risolvere il problema dell'upload cappato](https://forum.fibra.click/d/36541-rollback-sfp-zyxel-con-il-w3-hub-per-risolvere-il-problema-dellupload-cappato)