---
title: FS.com Generic Compatible XGSPON Stick ONU with MAC SFP+ (XGS-ONU-25-20NI)
has_children: true
layout: default
parent: FS.com
---
# Hardware Specifications
| | |
| ---------------- | -------------------------------------------------------------------------- |
| Vendor/Brand | FS |
| Model | XGS-ONU-25-20NI |
| ODM | CIG |
| ODM Product Code | XG-99S |
| Chipset | Cortina CA8271A |
| Flash | MX35LF1GE4AB 128MB |
| RAM | 128MB |
| CPU | Taroko V0.2 (MIPS) |
| CPU Clock | 500MHz |
| Bootloader | SATURN uboot |
| System | Custom Linux by Cortina (Saturn SDK) based on Kernel 4.4 Saturn-sfpplus-r1 |
| 2.5GBaseX | Yes |
| XGMII/XSGMII | Yes |
| Optics | SC/APC |
| IP address | 192.168.100.1 |
| Web Gui | |
| SSH | No |
| Telnet | ✅ |
| Serial | ✅ |
| Serial baud | 115200 |
| Serial encoding | 8-N-1 |
| Form Factor | miniONT SFP |
{% include image.html file="XGS-ONU-25-20NI/front.jpg" alt="XGS-ONU-25-20NI front plate" caption="XGS-ONU-25-20NI front plate" %}
{% include image.html file="XGS-ONU-25-20NI/internal.jpg" alt="XGS-ONU-25-20NI internal" caption="XGS-ONU-25-20NI internal layout" %}
## Serial
The stick has a TTL 3.3V UART console (configured as 115200 8-N-1) that can be accessed from the SFP connector, but no components are mounted.
The UART can be accessed by any of the following methods.
- Touch the needle to a specific point
- Shorting a specific pad to access from SFP
### Access from PCB
The UART can be accessed by connecting a wire or touching a needle to the following points.
{% include image.html file="XGS-ONU-25-20NI/UART_needle.png" alt="XGS-ONU-25-20NI UART Touch point" caption="XGS-ONU-25-20NI UART Touch point" %}
### Access from SFP
By shorting these two points with solder, you can access the UART from SFP pins 2 and 7.
| USB - TTL Adapter | SFP Connector (Molex, etc) |
| --------------------- | -------------------------- |
| Vcc (3.3V) | pin #15 , #16 |
| TX | pin #7 |
| RX | pin #2 |
| GND | pin #10 |
{% include alert.html content="USB TTL adapter may not work due to insufficient power supply. If possible, obtain 3.3V from the power supply device instead of the USB TTL adapter." alert="Note" icon="svg-info" color="blue" %}
{% include image.html file="XGS-ONU-25-20NI/UART_SFP.png" alt="XGS-ONU-25-20NI UART Short point" caption="XGS-ONU-25-20NI UART Short point" %}
{% include image.html file="XGS-ONU-25-20NI/UART_bridge.png" alt="XGS-ONU-25-20NI UART solder bridge" caption="XGS-ONU-25-20NI UART solder bridge" %}
## Firmware is interchangeable with
The firmware is compatible with the following.
- CIG XG-99S
- CIG XE-99S (10G-EPON mode)
- ECIN EN-XGSFPP-OMAC v1
## List of software versions
Available from `#ONT/system>ontver build` and `#ONT/system/shell>cat /etc/version`.
- R4.4.20.016 (from FS.com docs)
- R4.4.20.018 - 20230426061821
- R4.4.20.022 - 20230612033149
## List of partitions
| dev | size | erasesize | name |
| ------ | -------- | --------- | ----------------- |
| mtd0 | 00040000 | 00020000 | "ssb" |
| mtd1 | 00002000 | 00020000 | "uboot-env" |
| mtd2 | 00002000 | 00020000 | "dtb0" |
| mtd3 | 0003c000 | 00020000 | "kernel0" |
| mtd4 | 00300000 | 00020000 | "rootfs0" |
| mtd5 | 004c0000 | 00020000 | "dtb1" |
| mtd6 | 00300000 | 00020000 | "kernel1" |
| mtd7 | 004c0000 | 00020000 | "rootfs1" |
| mtd8 | 00001000 | 00020000 | "userdata" |
| mtd9 | 00001000 | 00020000 | "mfginfo1" |
| mtd10 | 00001000 | 00020000 | "mfginfo2" |
| mtd11 | 00001000 | 00020000 | "uboot-env2" |
This ONT supports dual boot.
`kernel0` and `rootfs0` respectively contain the kernel and firmware of the first image, `kernel1` and `rootfs1` the kernel and the firmware of the second one.
# Useful files and binaries
## scfg.txt
In the XGS-ONU-25-20NI ONT, the settings are loaded by four `scfg.txt` files.
For rewriting settings, `/userdata/scfg.txt` and `/tmp/scfg.txt` are used.
- `/config/default_scfg.txt` (read only): Contains the manufacturer's default settings, which are read first at ONT startup and are the lowest priority settings.
- `/config/scfg.txt` (read only): Contains settings set by the firmware creator, which have higher priority than `default_scfg.txt` and will overwrite the settings if there is a conflict.
- `/userdata/scfg.txt` (read/write): Contains settings set by the user or ISP. It has a higher priority than `/config/scfg.txt` and will overwrite the settings if there is a conflict. Can be edited and saved.
- `/tmp/scfg.txt` (temp): It contains dynamically generated settings based on values stored on its custom ROM (mtd9, mtd10). Since they are generated on tmpfs and cannot be saved directly, they are rewritten via the `#ONT> system/misc` command on the ONT.
The settings are overwritten and loaded at startup with the following priority:
***(High)*** `/tmp/scfg.txt` > `/userdata/scfg.txt` > `/config/scfg.txt` > `/config/default_scfg.txt` ***(Low)***
## Misc Command
To configure settings using the MISC command, execute the following command:
```
#ONT> system/misc
#ONT/system/misc>
```
# Usage
## Login and Enable
This stick does not have a web GUI.
To configure it, you must log in via `UART` or `Telnet`.
{% include alert.html content="FS.com Stick XGS-ONU-25-20NI does not have PON S/N on the label. (The S/N field stamped on the label is FS.com internal S/N, not PON S/N). In order to get it, you can either ask an FS.com sales representative or check the boot log from the UART!" alert="Note" icon="svg-info" color="blue" %}
| User | Password (Enable Password) |
| ------------------------ | ----------------------------------------------------------- |
| ONU GPON Serial Number | 8 digit HMAC-MD5 based on Uppercase ONU GPON Serial Number |
You can use the following form to generate login credentials:
{% include cig_password_xgspon.html password_len="8" %}
Or you can follow this external documentation on how to [emulate the ONT in QEMU](https://github.com/YuukiJapanTech/CA8271x), so use it at your own risk.
UART does not ask for a login, it is possible to get a root shell without knowing the password.
## Root procedure
After logging in via `telnet` or `UART`, you will first get the MiniShell with user privileges.
```
ONT>
```
The root MiniShell can be obtained by executing the `enable` command on this MiniShell.
```
ONT> enable
#ONT>
```
You can then switch to the Linux root shell by executing the following command:
```
#ONT> system/shell
#ONT/system/Shell> sh
#
```
# GPON ONU status
## Get the operational status of the ONU
Check the ONU Registration State with the following command:
```
#ONT> traffic/pon/show onu
------------------------- ONU INFO --------------------------
Onu id 65535
sdThreshold: 0
sfThreshold: 0
TO1: 80000
TO2: 1
eqd: 0
Serial Number(vendor code): GPON
Serial Number(sn): abcd1234
Password: 30 31 32 33 34 353 36 37 38 39
Registration ID: 0x44454641554c540000000000000000000000000000000000000000000000000000000000
------------------------- INFO END --------------------------
#ONT>
```
Check the ONU operation state with the following command:
```
#ONT>traffic/pon/show link
----------------- LINK STATE -----------------
Operation State Machine: INIT (O1)
----------------- STATE END -----------------
#ONT>
```
## Get information of the OLT vendor
OLT information can be extracted from the MIB with the following command:
```
#ONT>system/mib/show 131
Table Oltg, Olt-g, total 1 instances
EntityID = 0x0000
VendorId = ""
EquipmentId = ""
Version = 00 00 00 00 00 00 00 00 00 00 00 00 00 00
TimeOfDay = 00 00 00 00 00 00 00 00 00 00 00 00 00 00
#ONT>
```
## Querying a particular OMCI ME
You can browse the MIB with the following command:
```
#ONT> system/mib
#ONT/system/mib>
```
### Show a list of MIBs supported by ONT
```
#ONT/system/mib> show
This command prints out the content of a mib table.
Usage: show CLASSID
CLASSID:
the class ID of the ME, defined in 983.2/984.4, currently
the following MEs are supported:
ClassID Name Desc
256 Ontg Ont-g
etc...
```
### Show a specific MIB
For example, to display MIB 256 (Ont-g):
```
#ONT/system/mib>show 256
Table Ontg, Ont-g, total 1 instances
EntityID = 0x0000
VID = "GPON"
Version = 58 47 2d 39 39 53 00 00 00 00 00 00 00 00
SerialNum = 47 50 4f 4e ab cd 12 34
TraffMgtOpt = 2
AtmCCOpt = 0
BatteryBack = 1
AdminState = 0
OpState = 0
OnuSurvivalTime = 0
Loid = ""
Password = ""
AuthState = 0
OntState = 1
#ONT/system/mib>
```
### Dump of a MIB
Output a dump of mib to `/tmp/mibdump.txt`
```
#ONT/system/mib> dump
MIB is saved to the file /tmp/mibdump.txt.
#ONT/system/mib>
```
## Getting Speed LAN Mode
LAN Speed Mode can be verified from the `Status` column displayed by the following command:
```
#ONT>traffic/eth/show pack
build time Apr 26 2023: 06:23:15
-------------------- Line Pack -- PWR 0X0 --
Line Slot 10, NumOfPorts 1, type 49, subtype 75, state 2
-------------------- Configuration -------------------
port | enable | loop | Mode | RL Type | RL Us Rate| RL Ds Rate|
1 Yes No Auto 0 0 0
-------------------- Status -------------------
1) link state: Up, link mode: 2.5G Full
-------------------- Bridge Pack -------------------
Type: 75
State: 2
MAC Table: 0
MAC Aging: 0
MTU: 0
-------------------- Chip Data -------------------
eth Fd: 7
port Mask: 0x0018
type 28
********** DEBUG INFO **********
EmrLogId : 5
EmrAdminEn : 0
EmrbeInited : 1
EmrDumpConn : 0
EmrPwrShedEn : 0x0
EmrConnItemNum : 0
EmrUsDsReverseEn : 1
EmrConnAllVidCheck : 0
EmrMcastGemVlanOpEn : 1
gEmrSaveConnItemEn : 1
gEmrMcastCrossVlanEn : 1
EmrUniExtractPriMatch : 1
EMR_DRV_PACK_DUMP_ITEM_EN : 0
********************************
#ONT>
```
# GPON/OMCI settings
XGS-ONU-25-20NI ONT uses `scfg.txt` file and misc command for configuration.
## Getting/Setting ONU GPON Serial Number
This setting must be changed with the `misc` CLI option and the `eqsn set "<serialnumber>"` command.
For example, if the SN is like `GPONabcd1234` (`47504f4eabcd1234`):
```
#ONT/system/misc> eqsn set "GPONabcd1234"
```
The get command can also be used to retrieve the configured PON S/N.
```
#ONT/system/misc> eqsn get
eqsn: GPONabcd1234
```
## Getting/Setting ONU GPON PLOAM password
This setting must be changed with the `misc` CLI option and the `exeep_w8 "<password>"` command.
For example, if the PLOAM password is like `0123456789`:
```
#ONT/system/misc> exeep_w8 "0123456789"
```
The `exeep_r8` command can also be used to retrieve the configured PLOAM password.
```
#ONT/system/misc> exeep_r8
[00, 000] 44 45 46 41 55 4c 54 00 - 00 00 00 00 00 00 00 00 | DEFAULT......
[10, 016] 00 00 00 00 00 00 00 00 - 00 00 00 00 00 00 00 00 | .............
[20, 032] 00 00 00 00 ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[30, 048] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[40, 064] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[50, 080] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[60, 096] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[70, 112] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[80, 128] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[90, 144] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[a0, 160] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[b0, 176] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[c0, 192] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[d0, 208] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[e0, 224] ff ff ff ff ff ff ff ff - ff ff ff ff ff ff ff ff | .............
[f0, 240] ff ff ff ff ff ff ff ff - ff ff ff ff 15 91 f3 9f | ............k
```
## Getting/Setting ONU GPON LOID
This setting must be changed in `scfg.txt`, using the key `CHAR-ARRAY CFG_ID_LOID`.
To modify LOID username we add the following line to `/userdata/scfg.txt`:
```
CHAR-ARRAY CFG_ID_LOID = { 0xXX,0xXX,0xXX,0xXX, 0xXX,0xXX,0xXX,0xXX, 0xXX,0xXX,0xXX,0xXX, 0xXX,0xXX,0xXX,0xXX, 0xXX,0xXX,0xXX,0xXX, 0xXX,0xXX,0xXX,0xXX };
```
For example, if the LOID is like `0123456`:
```
CHAR-ARRAY CFG_ID_LOID = { 0x30,0x31,0x32,0x33, 0x34,0x35,0x36,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00 };
```
## Getting/Setting ONU GPON LOID password
This setting must be changed with the `misc` CLI option and the `pon_passwd set <password>` command.
For example, if the LOID password is like `0123456789`:
```
#ONT/system/misc> pon_passwd set 0123456789
```
The `get` option can also be used to retrieve the configured LOID password:
```
#ONT/system/misc> pon_passwd get
eqsn: 01234567890000000000
```
## Getting/Setting OMCI hardware version (ME 256)
This setting must be changed with the `misc` CLI option and the `eqvid set "<hwver>"` command.
For example, if the hardware version is like `abc123`:
```
#ONT/system/misc> eqvid set "abc123"
```
The `get` option can also be used to retrieve the configured hardware version.
```
#ONT/system/misc> eqvid get
eqvid: abc123
```
## Getting/Setting OMCI vendor ID (ME 256)
This setting must be changed with the `misc` CLI option and the `vendor set "<vendor>"` command.
For example, if the vendor is like `GPON`:
```
#ONT/system/misc> vendor set "GPON"
```
The `get` option can also be used to retrieve the configured PON S/N vendor field:
```
#ONT/system/misc> vendor get
vendor: GPON
```
In this ONT, the MIB OntG Vendor can be set to a value different from the S/N vendor value:
```
#ONT/system/misc> eqsn get
eqsn: GPONabcd1234
#ONT/system/misc> vendor get
vendor: ZTEG
```
# Advanced settings
See the link below for other MiniShell commands.
- [MiniShell command tree](/xgs/ont-fs-XGS-ONU-25-20NI-cli)
## Transferring files to the stick
Stick's busybox (Linux shell) supports netcat and TFTP, which allow to send and receive files:
```
# tar cf - localfile | nc remotehost-ip 10000
```
```
# tftp -r remotefile.bin -g remotehost-ip
```
## Backup of all partition
To obtain a backup, use the `dd` command to save it on `/tmp`,
or use the `cat` command to transfer it via netcat.
```
# dd if=/dev/mtdX of=/tmp/mtdX.bin
# tftp -l /tmp/mtdX.bin -r remotehost-ip
```
```
# cat /dev/mtdX | nc remotehost-ip 10000
```
When partition writing to the stick, use the flash command set.
(Do not write with the `dd` command because ECC is enabled).
```
# flash_eraseall /dev/mtdX
# flashcp -v targetfile /dev/mtdX
```
## Setting management IP
To change the management IP, set it with the `misc` CLI option and the `admin_ip set <ip>` command.
For example, if the management IP is like `192.168.1.1`:
```
#ONT/system/misc> admin_ip set 192.168.1.1
```
To change the management IP netmask, set it with the `misc` CLI option and the `admin_mask set <netmask>` command.
For example, if the management IP mask is like `255.255.255.0`:
```
#ONT/system/misc> admin_mask set 255.255.255.0
```
# Random notes
## Bricked stick Repair
{% include alert.html content="This is an external file ([mtd dump](https://github.com/YuukiJapanTech/CA8271x)), so use it at your own risk!" alert="Note" icon="svg-info" color="blue" %}
If the stick is bricked, it can be repaired by accessing uboot from the UART.
If stick fails to boot, uboot will enable text input.
```
ERROR: can't get kernel image!
SATURN#
```
Download stick's mtd dump from [mtd dump.](https://github.com/YuukiJapanTech/CA8271x/tree/main/mtd)
Enable NAND with the following command:
```
SATURN# spi_nand probe 0
SPI_NAND ID: 0x12c200
SPI-NAND: MX35LF1GE4AB is found.
MX35LF1GE4AB
spinand_oob_size:0x40
spinand_page_size:0x800
spinand_blk_size:0x20000
spinand_size:0x8000000
SATURN#
```
Receive the file with the `loadb` command.
```
SATURN# loadb 0x80000000
## Ready for binary (kermit) download to 0x80000000 at 115200 bps...
```
Using Tera Term, send the Kernel image (mtd3 or mtd6) by kermit transfer.
{% include image.html file="XGS-ONU-25-20NI/Stick_Rep.png" alt="XGS-ONU-25-20NI Repair" caption="XGS-ONU-25-20NI Repair" %}
Erase NAND and write the transferred kernel.
```
SATURN# spi_nand erase 0x000000600000 0x600000
SATURN# spi_nand erase 0x000003500000 0x600000
SATURN# spi_nand write 0x80000000 0x000000600000 0x600000
SATURN# spi_nand write 0x80000000 0x000003500000 0x600000
```
Receive the file with the `loadb` command.
and Using Tera Term, send the rootfs image (mtd4 or mtd7) by kermit transfer.
```
SATURN# loadb 0x81000000
## Ready for binary (kermit) download to 0x81000000 at 115200 bps...
```
Erase NAND and write the transferred rootfs.
```
SATURN# spi_nand erase 0x000000c00000 0x2800000
SATURN# spi_nand erase 0x000003b00000 0x2800000
SATURN# spi_nand write 0x81000000 0x000000c00000 0x2800000
SATURN# spi_nand write 0x81000000 0x000003b00000 0x2800000
```
When the stick is turned back on, it will boot with the transferred kernel and rootfs.
# Known Bugs
- There is a bug in the `register_id` command in the `misc` CLI option that changes the value of `pon_passwd` (LOID Password) instead of `register_id` (PLOAM).
# Miscellaneous Links
- [GitHub - CA8271x](https://github.com/YuukiJapanTech/CA8271x)
