🚀 go-pugleaf

Deanna,
 The speed that you old modem was reporting is the "Port speed".  This is
the speed at which your computer communicates with the modem.  It is
likely that it was reporting 57,600bps, the maximum speed of your serial
port.

 The new modem appears to be reporting the "Carrier speed".  This is the
actual speed of your connection to MicroServe, and is dependent upon the
quality of phone lines between you and MicroServe's facility.

 On most modems, adding the "W2" parameter to the init string of your
modem will cause it to report Carrier speed instead of Port speed. 

 Since MicroServe's Harrisburg facility does not yet support 56k, the
modem will use the v.34 standard to connect to us, and your maximum speed
would be 33.6k on "perfect" phone lines.  According to reports from other
users in Harrisburg, 26400bps is a good connect speed for that area.  

 Causes of these slower-than-normal connect speeds are poor phone line
quality (on both ends of the connection) and the phone company's use of
SLC-96 (pronounced "slick 96") concentrators.  A Slick allows the phone
company to provide service to a larger number of customers without
installing more physical copper wires from the Central Office. 
Unfortunately, the use of a Slick also degrades the phone quality enough
to limit connect speeds to about 26,400bps.  Many Harrisburg area
telephone customers' phone lines are connected to Slicks, so most people
won't approach 33.6k on a v.34 modem.

-Thomas Rusnock, Network Operations Center


On Wed, 17 Dec 1997 dmills@ducks.microserve.com wrote:

>we just recently upgraded our modem to a 56k, from a 28.8 and i'm noticing a
>strange thing.  we connect from harrisburg and the connection speed is
>always shown, and before this upgrade, we always connected at 57900bps or
>something like that.  now, since the upgrade, our connection speed has
>consistently been at 26400bps.  
>
>i understand that 56k is not supported in harrisburg yet, but why am i
>connecting to a different, lower speed than before?
>
>i am using 234-9137 and have the modem set to connect to the highest speed
>available up to 115200 but not restricted to any speed.  
>deanna mills
>dmills@ducks.microserve.com
>
>
>


------------------------------------------------------------------------------
Tom Rusnock     tomr@admin.microserve.net               

Network Operations Center
MicroServe Information Systems
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