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- Newsgroups: comp.dcom.modems
- Path: FreeNet.Carleton.CA!an171
- From: an171@FreeNet.Carleton.CA (Anthony Hill)
- Subject: Re: faster than 28.8
- Message-ID: <DMstCE.E5w@freenet.carleton.ca>
- Sender: an171@freenet5.carleton.ca (Anthony Hill)
- Reply-To: an171@FreeNet.Carleton.CA (Anthony Hill)
- Organization: The National Capital FreeNet
- References: <sumner-2001961038000001@sumner.tiac.net> <4ds0fp$4ap4@news-s01.ny.us.ibm.net> <AD29910A96685C7229@asd-stat13-153.dial.xs4all.nl> <bgrubb-2301960739100001@10.0.2.15> <4e3lbi$r3m@brachio.zrz.TU-Berlin.DE> <eric-2601960120540001@sobt.accessorl.n <4fstqv$1ikm@seminole.gate.net>
- Date: Thu, 15 Feb 1996 03:50:38 GMT
-
-
- doug haire (dhaire@gate.net) writes:
- > Anthony Hill (an171@FreeNet.Carleton.CA) wrote:
- > :
- > : Hate to break it to you, but he may have come accross a perfectly
- > : valid solution as to why he got the results he did. Now, that's not to
- > : say that this in any way reflects the performance of the modem over real
- > : world conditions, but it could explain why his tests results were the way
- > : they were. It also brings up an intersting question of why the Courier
- > : didn't correctly adjust it's Tx Power level like the Supra did.
- >
- > And I say it's bullshit. How about that? Where's the testing over live
- > circuits? When's he going to do this?
-
- And you say HE is avoiding the topic? :> Anyway, I won't make any
- comments about working over real lines, simply that he MAY have found a
- reason why the Courier was slower then the Supra in his test results. If
- you know of a better explanation I'm sure we'd all love to hear it..
-
- > If you believe what he says, go read the db levels with a USR Courier
- > online and then with some other modem then report back here with the results.
- > I don't believe him and I don't believe you.
-
- Actually I have done some experimenting with this. I found that
- on modems on which I could manually adjust the Tx Power level that values
- of -12 to -13dBm worked best, while both USR Courier and USR Sportster on
- the same connection seemed to chose about -11dBm. I never much worried
- about it though since the connect rates and throughput with the USRs was
- always up to par, and besides, there were some other more important
- differences that I've noted with some other modems (eg. USRs would use the
- 3429 symbol rate, while other modems used the 3200 symbol rate for the
- same connection, even though they DID support the 3429 symbol rate). Now,
- why this happens I don't know, it could be that USRs can handle any sort
- of echo better then some other modems and they can benefit from the
- slightly higher tx power level, or it could just be a strange coincedance.
-
- Anthony
- --
- Anthony Hill | an171@FreeNet.Carleton.CA
-