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PPoE or PPoA?
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PPoE or PPoA?
21-12-2011 11:40 PM
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Is one faster than the other? Does one have less overheads?
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Re: PPoE or PPoA?
21-12-2011 11:50 PM
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I believe PPPoA is optimal. PPPoE does work on 21CN though.
Not sure about FTTC.
Not sure about FTTC.
Message 2 of 7
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Re: PPoE or PPoA?
22-12-2011 12:07 AM
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Thanks for the response. Does anybody else have any experience?
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Re: PPoE or PPoA?
22-12-2011 1:38 AM
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Here's the difference....
Don't know about any of that, but found this :-
Don't know about any of that, but found this :-
Quote All ADSL lines use 'ATM' as the encapsulation between your modem and the exchange. The ATM protocol chops all data into 48 byte chunks called 'cells'. To send an Ethernet packet over ATM, you need to chop the Ethernet frame into a string of up to 32 cells. If you send a PPP frame over ATM, the Ethernet framing is removed and only the PPP is sent but it still ends up being 32 cells max per frame.
PPPoE overheads are a little more than PPPoA. I think that the PPPoE requires about 20 - 30 bytes or so more. Because ATM cells are fixed lengths, the difference between PPPoE and PPPoA only matters if the frame that is being sent plus the overhead requires one more cell. For example, if the PPPoA frame is 720 bytes long, it can be sent in 15 cells. But the PPPoE frame would require 16 cells because the extra overhead wouldn't fit into 15.
The PPPoE method ends up requiring perhaps 1-2% extra overhead. If you think you might notice this, change to PPPoA. But unless you peg your line to 100% utilisation for long periods, you really won't notice any difference. The extra PPPoE overhead will just fill up the cells that were empty anyway.
More recently, Telstra has been setting up DSL lines so that the modems always train to 1500 and the shaping is done in the BRAS instead of on the DSL line. I think (and I stand to be corrected here), that this practice eliminates all difference between PPPoE and PPPoA if you've got a 512k or 256k service. (A 1500 service still sees the 1% benefit from PPPoA - if you can sustain 100% load on your 1500 line).
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Re: PPoE or PPoA?
22-12-2011 1:42 AM
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As far as I am aware, PPPoA also allows for multiplexing whilst oE doesn't. Could be mistaken.
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Re: PPoE or PPoA?
22-12-2011 8:47 AM
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Historically (20CN), all UK ISPs used PPPoA except for AOL who used PPPoE.
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Re: PPoE or PPoA?
22-12-2011 11:29 AM
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Quote from: CX23882 Not sure about FTTC.
That only works with PPPoE - No ATM layer in the FTTC architecture.
Plusnet Customer
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Using FTTC since 2011. Currently on 80/20 Unlimited Fibre Extra.
Message 7 of 7
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