Lower VDSL Sync Speeds

Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › Lower VDSL Sync Speeds

Spaghetti

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#226086 19-Dec-2017 19:11

I recently moved to MyRepublic from Flip, and I am getting lower sync speeds. Used to get around 24/4, now get 17/1 down/up.

When you change ISP's would this cause the VDSL DLM to do a re-calibration? I'm wondering if this caused it.

Or would it be the new modem I am using (used an NF4V before, now using Technicolor 789ac v2)?

Trying to figure out if its the modem, or I should just wait another 10 days for the DLM profile to sort itself out.

Thanks!

hio77

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Lizard Networks

#1922132 19-Dec-2017 19:32

Please post line stats.

Lines can reset the dlm process between provider moves, but this is uncommon these days.

Different modems WILL have different experiences in sync speed... This can be marginal or very noticable.

In your case, I'm skeptical about the drop from 4mbit up down to 1mbit. 24 down to 17 i could argue as being ddDLM moving from 6dB to 12dB or a large psd drop.

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Spaghetti

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#1922138 19-Dec-2017 19:45

THanks for the reply hio77,

I did notice quite a difference in speeds on Flip when going from a Netgear DM200 VDSL modem to the NF4V (provided by Slingshot), so thought it possible its the modem. However, I thought MyRepublic would provide the best modem for their service in order to keep customers happy.

This device doesnt seem to have much in the way of stats, heres the info from the broadband page.

Maximum Line rate

1.14 Mbps 17.05 Mbps

Line Rate

1.08 Mbps 17.02 Mbps

Output Power

7 dBm 14.6 dBm

Line Attenuation

10.9 dB 24.4,N/A,N/A dB

Noise Margin

6.9 dB 5.7 dB

Is that what you were after?

hio77

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#1922140 19-Dec-2017 19:52

Do you still have the old modem? possible to plug it in and test?

The fact that you are only reading the First two bands tells me one of two things

possibly a filter installed incorrectly
your actually negotiating at ADSL2+

What modem have they provided you? mrp seem to supply quite a range.

It's hard for a RSP to provide a modem chipset that works in ALL situations, your line seems slightly long.

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Spaghetti

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#1922356 20-Dec-2017 09:22

Well, I rebooted the Technicolor, and got slightly improved speed, 21/1.4

Connected the NF4V and got the same sync rates 21/1.4 so went back to Technicolor.

I'm guess that I just have to wait for the DLM to do its thing.

hio77

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#1922365 20-Dec-2017 09:26

Please post stats from the nf4v. It's my favorite for detail.

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Spaghetti

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#1922381 20-Dec-2017 10:13

Here you go, hopefully includes enough detail:

Device Info

Manufacturer: NetComm Wireless

Product Class: NF4V

Serial Number:

Build Timestamp: 201607111450

Software Version: NF4V_Slingshot-R5B020.EN

Bootloader (CFE) Version: 1.0.38-114.170

DSL PHY and Driver Version: A2pv6F039k.d25b

VDSL PROFILE: 17a

Wireless Driver Version: 6.30.163.23.cpe4.12L

Voice Service Version: V2.4

Uptime: 0D 0H 4M 25S

This information reflects the current status of your WAN connection.

B0 Traffic Type: PTM

B0 Line Rate - Upstream (Kbps): 1475

B0 Line Rate - Downstream (Kbps): 20563

B1 Traffic Type: Inactive

B1 Line Rate - Upstream (Kbps): 0

B1 Line Rate - Downstream (Kbps): 0

LAN IPv4 Address: 10.1.2.3

LAN MAC Address:

Default Gateway:

Primary DNS Server: 0.0.0.0

Secondary DNS Server: 0.0.0.0

LAN IPv6 Address:

Default IPv6 Gateway: ppp1.1

Date/Time: Sat Nov 19 00:04:17 2011

Synchronized Time: 0:0:2:26

Number of Synchronizations: 1

Mode: VDSL2 Annex B

Traffic Type: PTM

Status: Up

Link Power State: L0

Copper Loop(kft): 0.0

Downstream Upstream

Line Coding(Trellis): On On

SNR Margin (0.1 dB): 71 58

Attenuation (0.1 dB): 276 0

Output Power (0.1 dBm): 125 53

Attainable Rate (Kbps): 21690 1632

Path 0 Path 1

Downstream Upstream Downstream Upstream

Rate (Kbps): 20563 1475 0 0

B (# of bytes in Mux Data Frame): 243 90 0 0

M (# of Mux Data Frames in an RS codeword): 1 2 0 0

T (# of Mux Data Frames in an OH sub-frame): 61 6 0 0

R (# of redundancy bytes in the RS codeword): 10 16 0 0

S (# of data symbols over which the RS code word spans): 0.3774 3.9245 0.0000 0.0000

L (# of bits transmitted in each data symbol): 5384 424 0 0

D (interleaver depth): 53 63 0 0

I (interleaver block size in bytes): 254 26 0 0

N (RS codeword size): 254 208 0 0

Delay (msec): 5 7 0 0

INP (DMT symbol): 0.00 1.00 0.00 0.00

OH Frames: 25094 9725 0 0

OH Frame Errors: 2 1 0 0

RS Words: 1520236 147806 0 0

RS Correctable Errors: 55 4090 0 0

RS Uncorrectable Errors: 15 0 0 0

HEC Errors: 4 0 0 0

OCD Errors: 0 0 0 0

LCD Errors: 0 0 0 0

Total Cells: 5733758 0 0 0

Data Cells: 816 0 0 0

Bit Errors: 0 0 0 0

Total ES: 1 1

Total SES: 0 0

Total UAS: 46 46

hio77

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#1922385 20-Dec-2017 10:20

Ok, so definitely negotiating VDSL.

All i can put this down to is possibility a change of dslam, but last i checked for VDSL Flip and MRP use chorus's gear so wouldn't be the case.

I'd ask your RSP to file a nonselfservice, raising exactly what your previous stats are and asking Chorus to check the network end.

Past that, As mentioned before. Double check filters etc.

#include <std_disclaimer>

Any comments made are personal opinion and do not reflect directly on the position my current or past employers may have.