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- Newsgroups: comp.dcom.modems
- Path: sparky!uunet!elroy.jpl.nasa.gov!sdd.hp.com!wupost!csus.edu!netcomsv!mork!jimb47
- From: jimb47@netcom.com (Jim Budler)
- Subject: Re: PRACT PERIPH 14400FXSA
- Message-ID: <+gqmnsp.jimb47@netcom.com>
- Date: Fri, 31 Jul 92 06:49:15 GMT
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <1113.48.uupcb@uttsbbs.uucp> <1992Jul30.195408.3570@murdoch.acc.Virginia.EDU>
- Lines: 46
-
- In article <1992Jul30.195408.3570@murdoch.acc.Virginia.EDU> sabrom@cebaf9.cebaf.gov (Seth Bromberger) writes:
- >
- >Just found out...
- >Practical Peripherals called me regarding the AT&T19 (RTS/CTS test) command.
- >It turns out that this command is software-activated only, as it expects some
- >sort of response before an internal timeout. If you type AT&T19 in command
- >mode, you will get ERROR since you are not sending the signal and the modem
- >times out waiting for it.
- >
- >This is what PPI told me; I have no way of verifying this, since I don't
- >know what public software (if any) supports this test. If anyone knows
- >about any support for AT&T19, please let me know...
-
- If you have a Mac, the program CableTest is available from the Hayes Forum on
- CIS.
-
- With the PM14400FXSA, and a standard Mac modem cable, the program
- returned the message "modem not responding". With a hardware handshake
- cable it returned the message "This cable supports RTS/CTS handshaking".
-
- I have independent verification that the cable supports hardware
- handshake, that I trust a lot more.
-
- Lock the DTE at 57600 bps, with the modem and the terminal
- program (ZTerm in my case) both configured for hardware handshake.
-
- Connect to a 2400 bps machine.
-
- Use a large block protocol (sz -k)
-
- Upload a large file. (Actually it doesn't have to be very large 10k or
- so, but I did a 100k file)
-
- Watch the retry count. For my 100k file, the retry count was 0.
-
- Handshake had to be working. Kermit, with 92 byte handshaking, might
- have managed the speed difference without handshaking between the modem
- and my computer. The 1k blocks in the protocol I used could not have
- survived flow control not working.
-
- jim
-
- --
- Jim Budler
-
- also jimb@silvlis.com and 72415.1200@compuserve.com
-