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Technicolor TC4400

The TC4400 is a cable modem by Technicolor. It provides Docsis 3.0, Euro-Docsis 3.0 and Docsis 3.1 support.

Technical Specifications

  • (Euro-)Docsis 3.0: 32x8 bonded channels
  • Docsis 3.1: 2x2 OFDM(A) bonded channels
  • ETH chip1: Broadcom BCM3390 (dual core, 1.5 GHz)
  • Switch: Broadcom BCM3390
  • LAN speed: 10/100/1000
  • LAN ports: 2
  • 128MiB Flash
  • 256MiB RAM
  • Built in RF spectrum analyzer
  • Official Data Sheet


Description Address Username Password
Webinterface 1 admin bEn2o#US9s
Webinterface 1 user Techni1789#
Spectrum Analyzer admin password
Webinterface 2 http://(Management IP) admin password


DHCPv6 Solicit issue

With firmware SR70.12.33-180308 or lower, the TC4400 sends a tabstop (ASCII code 0x09) in the DHCPv6 Solicit request. This character can be misinterpreted as an escape sequence and lead to an incorrect processing of the DHCPv6 Solicit request.

In cable networks with IPv6 management like that of Vodafone (Germany), the TC4400 may not activate automatically. The laboratory firmware SR70.12.33-180327 fixes this issue.

Unfortunately, the TC4400 can only be updated via a CMTS. Customers are therefore dependent on their provider or retailer for the update.


eCos operating system for the RT-CM part of the BCM3390 (bootlog)