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- Newsgroups: comp.dcom.modems
- Path: sparky!uunet!decwrl!csus.edu!netcom.com!wolfgang
- From: wolfgang@netcom.com (Wolfgang Henke)
- Subject: Re: Throughput monitoring.
- Message-ID: <g-ln1xl.wolfgang@netcom.com>
- Date: Thu, 03 Sep 92 04:47:27 GMT
- Organization: Netcom
- References: <1992Sep02.171350.18581@lobo.rmhs.colorado.edu>
- X-Newsreader: Tin 1.1 PL4
- Lines: 47
-
- redder@lobo.rmhs.colorado.edu (Greg Redder) writes:
- :
- : I was asked to help test some new modems we received. They are
- : Microtech modems which are able to run at 14.4. We want to connect one
- : to a Cisco router and the other to a NAT router and PC over a dial-up line.
- : However, we want to be able to monitor the throughput and verify that it
- : is really 14.4. How would one go about doing this? Any suggestions would
- : be appreciated. Please mail to: redder@lobo.rmhs.colorado.edu.
-
- Aside from just watching file transfer speeds which give some indication
- of the DCE connect speed, you could have the escape sequence enabled on
- one of the modems and use some AT monitoring commands. I dont know them
- for a Multitech, but for a Scout, you would use AT*O.
-
- Here is a sample:
-
- +++ <-- escape sequence
- OK <-- now we are in local modem mode
- AT*O <-- now issue monitoring command
- MODEL:SCOUT PLUS <-- all this is printed out while still online
- DTE: 57600 N81
- DCE: 14400 V42B
- RECEIVE LEVEL= -36 DBM
-
- E1 K1 M1 Q0 V1 X4 TONE
- &B0 &C1 &D3 &R2 &T5
- *E1 *F3 *G1 *M2 *N6 *P0 *Q3 *S1 *T1 <-- *Q3 allows the modem full line
- quality control
- S00=001 S04=010 S08=002 S15=255
- S01=000 S05=008 S09=000 S18=000
- S02=043 S06=002 S10=003 S25=000
- S03=013 S07=045 S12=050 S26=000
- OK
- ATO <-- now we go back online
- CONNECT 14400 EC/V42B <-- connect string
-
-
- What do we do when its not connecting at 14,400 bps? Check the signal
- quality with the AT*SQ command. In contrast to a lot of other modems,
- the Scout+ does not print out only one value, but samples the signal
- quality 6 times per second, so that one can detect variations. I have
- found this to be a desirable feature.
-
- --
- _________________________________________________________________________
- Wolfgang Henke wolfgang@henke.sf-bay.org wolfgang@netcom.com
-
-