On Jul 24 17:35, 1997, Kenneth Burgess of 1:2216/77 wrote:
->>On 07-22-97  14:57 Dennis Was discussing problem with Rick<-
RC->> Sounds very much like a flow control problem.  Make sure your modem and 
RC->> yo
->> comm program are both configured for software (RTS/CTS) flow control.
KB>                                          ^^^^^^^^^^^^^^^^^^
KB>     I believe what you are reffering to here is (Xon/Xoff) flow control.
No, I meant what I said but I didn't say what I meant!  I meant to say 
_hardware_ (RTS/CTS) flow control.
RC->> You can generally receive data with no flow control enabled (because 
->> the CPU is so much faster than the modem, the PC never has to tell the 
->> modem to "wait 
KB>     Although most often true, not always true. Take for example these 
KB>   system configurations. Although rare there are still some in use today.
KB>   System (1) is a bbs user, system (2) is the bbs being accessed.
KB>   (1) -  2mhz CPU, 33.6k modem. Max buss at 19,200  
KB>   (2) - 33mhz CPU, 33.6k modem. Max buss at max modem through put.
KB>   Modem 1 & 2 can still negotiate a 33.6k link. However cpu #1 can not
KB>   accept data from it's modem at that rate. If modems #1 and #2 are not
KB>   BOTH configured for (Modem-Modem Xon/Xoff) flow control. There is a
KB>   real possibility that buffer overruns WILL occur.
CPU 1 would possibly require flow control in that situation, but with a USR 
modem it will not connect at 33.6 with a 19.2 port rate.  The receiving modem 
would assert modem to modem flow control with the sending modem, regardless 
of the flow control setting used in the PC, assuming an ARQ connection.
Rick
--- MsgedSQ 3.30
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