On (12 Apr 96) Rod Speed wrote to Keith Richardson...



PE> Or would you expect V32bis modems to always connect at 14400?



RS> Certainly not at 7200, thats extremely low. I would expect that if the

RS> line at your end or mine was marginal, we would occasionally see a 12000

RS> connect and in fact I did with one particular line with the City BBS which

RS> I called daily for mail for a long time. He is on one of the most decrepit

RS> exchanges in Sydney apparently and doesnt have his lines in a rotary

RS> group, and you could see one line being a bit down performance wise. It

RS> always connected fine, sometimes at 12000 and normally did manage to fall

RS> forward up to 14400 thru the session. Occasionally it connected at 14400

RS> and fell back to 12000 for a bit and back up to 14400 too.



KR> thats odd,



 RS> Nope.



KR> the city is on the same exchange as me, and it was upgraded

KR> a bit over 3 years ago, about the time that i moved in.



 RS> That time I was talking about was before that.



the implication of the phrase "he is one one of the most decrepit ...."

                                  ^^

is that the information is current.



KR> i always seem to get about the same results with pauls

KR> board, it used to be around 1610 cps, now it is around

KR> 1660 cps, so the 456 exchange wouldn't seem to be a problem.



 RS> Thats after the upgrade tho. And you cant use just the first

 RS> three digits to determine the exchange technology anyway.



in some cases tru, but berowra is a compact and isolated community, with

the exchange roughly on the east west axis. the city is approx 1 km

north of it, i am 1 km south, so, unless they have two exchanges in the

same building, we share the same technology.



KR> the city's lines though seem to have their own

KR> personalities, i don't know if it is the modems, the

KR> lines, or the various systems that comprise the board.



 RS> It appears to be atleast the lines coz its been visible thru modem

 RS> changes. The 'various systems that comprise the board' cant affect

 RS> the line speed stuff, just the thruput which I wasnt discussing.



the lines are the most probable cause.



 RS> Even quite geriatric exchanges arent necessarily a problem speed

 RS> wise with V32bis, in fact you get a bit more bandwidth with some

 RS> of the crossbar exchanges than you do with digital exchanges. That

 RS> primarily affects calls on the same exchange tho.



certainly motorola fast talk 2 modems dont work well on the digital pabx

at work where they are ok on outside lines.



                        Keith





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