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Author Topic: Output Power (dBm)  (Read 7338 times)

covlad1987

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Output Power (dBm)
« on: March 13, 2012, 10:20:23 AM »


hi is this normal to have no output power on the download ? the Attenuation (dB):   48.0    26.0 =3.5km

BUT  bt exchange Distance:-   Direct:         1.85 km
    (appx)*   By Road:    2.57 km

 

Downstream   Upstream
Output Power (dBm):   0.0    12.3
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roseway

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Re: Output Power (dBm)
« Reply #1 on: March 13, 2012, 10:37:35 AM »

Just a small correction: 0 dBm doesn't mean zero power, it's actually a power of 1 mW. See http://wiki.kitz.co.uk/index.php?title=Decibels#Decibels_used_as_power_measurement for more explanation.

However in this case it's almost certainly misreporting by the router, because such a low power with your attenuation wouldn't be enough for a connection. Certain types of router seem to be prone to this, perhaps because of some incompatibility with the DSLAM/MSAN.
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  Eric

covlad1987

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Re: Output Power (dBm)
« Reply #2 on: March 13, 2012, 10:47:43 AM »

Just a small correction: 0 dBm doesn't mean zero power, it's actually a power of 1 mW. See http://wiki.kitz.co.uk/index.php?title=Decibels#Decibels_used_as_power_measurement for more explanation.

However in this case it's almost certainly misreporting by the router, because such a low power with your attenuation wouldn't be enough for a connection. Certain types of router seem to be prone to this, perhaps because of some incompatibility with the DSLAM/MSAN.

thankyou for the info 
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renluop

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Re: Output Power (dBm)
« Reply #3 on: March 13, 2012, 01:13:39 PM »

The Thompson 585 I use does not show it either, but if you view the event logs (Connections) shortly after starting the router, it's there.
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c6em

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Re: Output Power (dBm)
« Reply #4 on: March 18, 2012, 04:58:43 PM »


Very common on ADSL2+ connections.
The router reports the download power OK on ADSL1/ADSLmax lines.
....but when the line is switched to ADSL2+ it reports the downstream power as zero.

I will discover in a few weeks whether mine does it as well.
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hacktrix2006

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Re: Output Power (dBm)
« Reply #5 on: May 04, 2017, 02:56:40 AM »

I have noticed this as well with the Tplink Archer V2600 (broadcom chipset) and as well as the TG 582n which is another broadcom chipset.

ADSL1 i get power reading but using ADSL2 or ADSL2+ will show 0db power so i wonder if its now a incompatibility with broadcom chipsets now with some dslam's?

There is also another thing i noticed if i go into ADSL 1 mode i am on fastpath put place the modem to ADSL2/2+ and it promptly put interleave 1 on the line work that one out.
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ejs

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Re: Output Power (dBm)
« Reply #6 on: May 04, 2017, 02:09:57 PM »

I think the misreported as zero issue depends on the type of exchange equipment rather than the modem. I think BTWholesale ADSL2+ equipment with vendor code IFTN tends to give the 0.
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hacktrix2006

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Re: Output Power (dBm)
« Reply #7 on: May 07, 2017, 03:19:04 PM »

Funny enough ejs i am on ADSL 2+ with the same vendor code IFTN.

So one might say there is a bug in the firmware of the IFTN equipment?
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ejs

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Re: Output Power (dBm)
« Reply #8 on: May 07, 2017, 03:36:18 PM »

Perhaps, although I'm not sure there are many stats from non-Broadcom modems available to check.

In any case, I think the IFTN equipment is still better than the TSTC equipment.

Edit: I just spotted some stats from what is presumably a Technicolor 585v8 (Infineon chip), ADSL2, showing the usual 18 dBm DS output power, and showing the IFTN vendor code. So perhaps it is the combination of modem and exchange vendors.
« Last Edit: May 07, 2017, 04:32:57 PM by ejs »
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tickmike

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Re: Output Power (dBm)
« Reply #9 on: May 07, 2017, 10:22:36 PM »

DSLAM/MSAN type:           IFTN:0x71c8 / v0x71c8
Power (dBm):           D= 0.0      U=12.7
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I have a set of 6 fixed IP's From  Eclipse  isp.BT ADSL2(G992.3) line>HG612 as a Modem, Bridge, WAN Not Bound to LAN1 or 2 + Also have FTTP (G.984) No One isp Fixed IP >Dual WAN pfSense (Hardware Firewall and routing).> Two WAN's, Ethernet LAN, DMZ LAN, Zyxel GS1100-24 Switch.
 

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