OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Base system
  • Assigned To No-one
  • Operating System All
  • Severity Medium
  • Priority Very Low
  • Reported Version openwrt-21.02
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Erik Porsche - 08.10.2021

FS#4071 - Lantiq-VRX200 modem is using wrong line mode

Supply the following if possible:
- Device problem occurs on
- AVM Fritz 7412
- Lantiq-VRX200

- Software versions of OpenWrt/LEDE release, packages, etc.
21.02.0 (r16279-5cc0535800)

- Steps to reproduce
- Flash firmware
- Enter ISP configuration for 1&1 (https://openwrt.org/docs/guide-user/network/wan/isp-configurations)
- Download and use the modem firmware supplied by AVM: 5.9.0.12.1.7 or 5.9.1.4.0.7

Openwrt will be using: Line Mode: G.993.2 (VDSL2 with down- and upstream vectoring)
instead of: Line Mode: G.993.5 (VDSL2 with down- and upstream vectoring)
which is used by the stock fritz box firmware. This results in a speed decrease from possible
Max. Attainable Data Rate (ATTNDR): 133.841 Mb/s (down) to 25.000 Mb/s (down)


moeller0 commented on 08.10.2021 11:12

Mmmh, G.993.5 is the actual vectoring spec and not the standard in use, according to how I read the new code
G.993.2 (VDSL2 with down- and upstream vectoring)
really is OpenWrt's way of saying G 993.5....

The downgrade in Download sync indicates maybe that the DSLAM put your modem into a fall-backprofile? (E.g. in Germany the incumbent Deutsche Telekom, will move links where DSLAM and Modem could not successfully negotiate vectoring into a profile only using the lowest 2.2 MHz of spectrum as that is exempted from Vectoring so that old ADSL modems do not eed to be relaced). Now, that system should automatically renegotiate vectoring and release the spectrum restricted profile once a vectoring capable mode successfully handshakes with the DSLAM, but I heard anecdotal reports, that operator intervention sometimes was required after sme experiments with non-vectoring enabled firmware blobs.

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