Technicolor TG789vac v2

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Technicolor TG789vac v2

This is the Technicolor TG789vac v2 shipped by many ISPs in Italy, Australia and the UK. It supports both ADSL2+/VDSL2 broadband connections and FTTH connections with a RJ-45 WAN port. Provides two FXS ports for VoIP-to-POTS telephony gateway features as well as one USB 2.0 port.

As said previously this unit is being shipped by different ISPs, such as:

  • TIM (Italy)
  • Tiscali (Italy)
  • Fastweb (Italy)
  • UNO (UK)
  • iiNet (Australia)
  • Internode (Australia)

Limited to version 15.05.1 (see notes).

Model Version SoC CPU Speed RAM NAND Flash WLAN Hardware WLAN2.4 WLAN5.0 100M ports Gbit ports Modem USB
TG789vac v2 Broadcom BCM63168 2x 400 MHz 256 MB 128 MB Broadcom BCM4360 b/g/n a/n/ac - 5 VDSL2 1x 2.0
Architecture MIPS
Vendor Broadcom
Bootloader ?
System-On-Chip Broadcom BCM63168VKFEBG
CPU/Speed 400 MHz
Flash Chip Micron MT29F1G08ABAEA
Flash Specs 128 MB
RAM Chip Samsung K4B2G1646F-BCK0
RAM Specs DDR3, 256 MB
Wireless 2.4Ghz Broadcom BCM4360, b/g/n, 2×2
Wireless 5Ghz Broadcom BCM4360, a/n/ac, 3×3
Ethernet 5x 10/100/1000 BASE-TX Ethernet Interface (1x WAN, 4x LAN)
Switch Broadcom BCM53124S
xDSL ADSL1/2/2+ (G.992.1/3/5) Annexes A, B, L, M
VDSL2 (G.993.2)
USB 1x 2.0
Serial ?
Power External, 12 V 2 A
Front tg789vac_v2.jpg
Back tg789vac_v2_backside.jpg
Left side tg789vac_v2_leftside.jpg
Right side tg789vac_v2_rightside.jpg
Bottom tg789vac_v2_bottom.jpg


Top tg789vac_v2_pcb-up.jpg
Bottom tg789vac_v2_pcb-down.jpg
CPU tg789vac_v2_cpu.jpg
Ethernet Switch tg789vac_v2_switch.jpg
WLAN Hardware tg789vac_v2_5-ghz-circuitry.jpg
Product Label tg789vac_v2_product-label.jpg

Remove the two rubber feets on the bottom, remove the screws underneath those then remove the top casing (it requires a bit of force).

port.serial general information about the serial port, serial port cable, etc.

How to connect to the Serial Port of this specific device:

A serial port header is available on the motherboard right next to the CPU. Unfortunately, the serial console doesn't seem to accept any input. Cables can be easily soldered to the PCB to access the serial port:

The serial console uses a baud rate of 115200 bps, 8N1.

port.jtag general information about the JTAG port, JTAG cable, etc.

How to connect to the JTAG Port of this specific device:
Insert photo of PCB with markings for JTAG port



OEM firmware images can be found here

The OEM firmwares are OpenWrt-based (OpenWrt 15.05.1 “Chaos Calmer”).
It is possible to obtain root access and install LuCI. More info here.
PCB photos were provided by bubez under a CC BY-NC-SA 2.5 IT license.

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  • Last modified: 2023/04/15 09:13
  • by vmsh0