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Author Topic: PTM standard  (Read 415 times)

Weaver

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PTM standard
« on: May 19, 2020, 01:09:35 AM »

I have just gone blank. I canít remember where the PTM protocol is defined, where the standards document is? Can anyone help me out?

I remember something about EFM, but what about G.992.3, G.992.5 and G.993.2 which uses PTM ? What do those specs reference?
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burakkucat

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Re: PTM standard
« Reply #1 on: May 19, 2020, 03:07:40 PM »

PTM -- Packet Transfer Mode.

Used by VDSL, VDSL2 and G.Fast services (ITU-T G.993.1, G.993.2 & G.997.2). Not ADSL2 and ADSL2+ services (ITU-T G.992.3 & G.992.5).

Perhaps the ITU-T SG15 Technical paper (12/2011) may provide some help?

EFM? Are you thinking of Ethernet in the First Mile?  :-\
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ejs

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Re: PTM standard
« Reply #2 on: May 19, 2020, 08:49:25 PM »

PTM is defined in Annex K of G.992.3 (ADSL2), which refers to G.993.1 (VDSL1).

I have seen PTM referred to as EFM, presumably an acronym for Ethernet Frames Mode.
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burakkucat

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Re: PTM standard
« Reply #3 on: May 19, 2020, 09:22:52 PM »

PTM is defined in Annex K of G.992.3 (ADSL2), which refers to G.993.1 (VDSL1).

Ah, that's where it's hiding. (Must try to remember.)

Quote
I have seen PTM referred to as EFM, presumably an acronym for Ethernet Frames Mode.

Thank you. That makes sense.  :)
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mofa2020

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Re: PTM standard
« Reply #4 on: May 19, 2020, 10:04:20 PM »

PTM is defined in Annex K of G.992.3 (ADSL2), which refers to G.993.1 (VDSL1).

is it somehow related to this line when getting line stats from telnet? linkEncapsulationUsed=G.993.2_Annex_K_PTM and my line is VDSL2.
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burakkucat

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Re: PTM standard
« Reply #5 on: May 19, 2020, 10:32:36 PM »

is it somehow related to this line when getting line stats from telnet? linkEncapsulationUsed=G.993.2_Annex_K_PTM and my line is VDSL2.

Yes, that is correct.
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Weaver

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Re: PTM standard
« Reply #6 on: May 19, 2020, 11:26:20 PM »

Somehow I had downloaded a G.992.3 document that was missing that annex, and then later after an enormous amount of hassle, I found what I needed separately. Thanks to all.
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