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Third Party Modem / Router - Download speeds decimated but upload speed normal

danhawes — Tue, 07 Nov 2023 23:36:11 GMT

I have tried to swap out the BT residential Smart hub 2 with a Zyxel VMG1312-T20B Modem in Bridge mode and a TP-Link AX3000 Router ( also tried using the Zyxel as the Modem + Router to same result ) but when I do my download speed is reduced from ~38Mbps to ~1Mbps yet my upload speed is normal ( 9 Mbps )

Can't tell where I am going wrong here I have a FTTC line and ethernet cabled from router to PC, VLAN ID is set to 101, PPPoE creds is bthomehub@btinternet.com / BT, RJ11 cable going from the master socket 5c to modem

For simplicity sakes I tried disconnecting the TP-Link router and using the Zyxel as both Modem + Router

WAN Interface Settings:

Strangely from the Zyxel Web GUI I can see expected speeds showing up on the DSL input line:

DSL information for good measure:

============================================================================
xDSLFwVersion: FwVer:5.10.6.0_B_A60901 HwVer:T14.F7_0.0
Line State: Up
Modulation: ITU G.993.2(VDSL2), G.998.4(G.INP) DS ONLY
Annex Mode: ANNEX_B
=============================================================================

TPSTC type: 64/65B PTM TC

near-end interleaved channel bit rate: 0 kbps
near-end fast channel bit rate: 39999 kbps
far-end interleaved channel bit rate: 0 kbps
far-end fast channel bit rate: 9994 kbps

near-end FEC error fast: 0
near-end FEC error interleaved: 0
near-end CRC error fast: 0
near-end CRC error interleaved: 0
near-end HEC error fast: 0
near-end HEC error interleaved: 0
far-end FEC error fast: 5
far-end FEC error interleaved: 0
far-end CRC error fast: 1
far-end CRC error interleaved: 0
far-end HEC error fast: 0
far-end HEC error interleaved: 0
DSL uptime :25 min, 31 secs
DSL activetime :0 min, 19 secs

Downstream:
relative capacity occupation: 100%
noise margin downstream: 11.2 dB
output power upstream: 0.9 dbm
attenuation downstream: 8.8 dB

Upstream:
relative capacity occupation: 100%
noise margin upstream: 10.2 dB
output power downstream: 0.8 dbm
attenuation upstream: 0.1 dB

Anything different I could try here setup wise? as soon as I reconnect Smart Hub I get back the usual speeds ( 38 Down / 9 Up )

Re: Third Party Modem / Router - Download speeds decimated but upload speed normal

imjolly — Wed, 08 Nov 2023 08:45:06 GMT

try bthomehub@btbroadband.com

Re: Third Party Modem / Router - Download speeds decimated but upload speed normal

danhawes — Wed, 08 Nov 2023 09:33:31 GMT

Sorry that was a typo, I was using bthomehub@btbroadband.com

Re: Third Party Modem / Router - Download speeds decimated but upload speed normal

TimCurtis — Wed, 08 Nov 2023 15:46:53 GMT

@danhawes

So have you corrected the entry in your router?

Re: Third Party Modem / Router - Download speeds decimated but upload speed normal

imjolly — Wed, 08 Nov 2023 15:59:07 GMT

@danhawes wrote:

Sorry that was a typo, I was using bthomehub@btbroadband.com

your router stats shows bthomehub@btinternet.com not btbroadband .com

Re: Third Party Modem / Router - Download speeds decimated but upload speed normal

danhawes — Mon, 20 Nov 2023 23:02:06 GMT

Sorry In my haste to recreate the settings after a factory reset in order to make this post I mistyped this field.

Originally and currently I have set the username to bthomehub@btbroadband .com