[comp.dcom.modems] Getting 1200-1300 cps with TB+

chris@utgard.uucp (Chris Anderson) (01/12/91)

Hello,

I realize that this has been hashed over before, but now *I*
need to know the answer!  Any help you could give would be 
appreciated.

I have a TB+ on a Plexus P-95 that is getting about 760cps
throughput with HDB uucp.  I'd like to be getting in the 
1200-1400 range.  The load on the system is very light, so
I'm fairly sure that the setup of the modem is at fault.

Here is my Systems file entry:

	xxxxxx	Any ACUTB 19200 ####### ogin:--ogin: yyyyy sword: zzz
	xxxxxx	Any ACU24 19200 ####### ogin:--ogin: yyyyy sword: zzz

Here's my Devices file:

	ACU24		tty0 - 19200 tb2400
	ACUTB		tty0 - 19200 tbfast

And here's my Dialers file:

	tbfast	=W-,	"" ATZ OK ATS50=255S7=60S111=30X3DTW\T CONNECT\sFAST
	tb2400	=W-,	"" ATZ OK ATS50=3S7=60S111=30X3DTW\T CONNECT\s2400

Obviously, I'm locking the interface at 19200 and manually setting
the registers for non-PEP transfers.

Anyway, here's my register settings:

$ cu -s 19200 -l /dev/tty0
Connected
at&n
E1 F1 M1 Q0 P V1 X1     Version BA3.00
S00=001 S01=000 S02=043 S03=013 S04=010 S05=008 S06=002 S07=040 S08=002 S09=006
S10=007 S11=070 S12=050 
S45=000 S47=004 S48=000 S49=000
S50=000 S51=005 S52=002 S53=000 S54=003 S55=000 S56=017 S57=019 S58=002 S59=000
S60=000 S61=200 S62=003 S63=001 S64=000 S65=000 S66=001 S67=000 S68=255 
S90=000 S91=000 S92=000 S95=000 
S100=000 S101=000 S102=000 S104=000 
S110=000 S111=255 S112=001 
S121=000 
N0:
N1:
N2:
N3:
N4:
N5:
N6:
N7:
N8:
N9:
OK
~[utgard].

Disconnected

Can anybody tell me what I'm doing wrong?  Email please, I'll
summarize if there's interest.  Thanks in advance.

Chris
-- 
+---------------------------------------------------------------+
|  Chris Anderson, QMA, Inc.      utgard!chris@csusac.csus.edu  |
|      My employer doesn't listen to me... why should you?      |
+---------------------------------------------------------------+

larry@nstar.rn.com (Larry Snyder) (01/16/91)

chris@utgard.uucp (Chris Anderson) writes:

>I have a TB+ on a Plexus P-95 that is getting about 760cps
>throughput with HDB uucp.  I'd like to be getting in the 
>1200-1400 range.  The load on the system is very light, so

Does the Plexus support hardware flow control?

Can the Plexus support 19200 without the loss of characters?

-- 
   Larry Snyder, NSTAR Public Access Unix 219-289-0282 (HST/PEP/V.32/v.42bis)
                        regional UUCP mapping coordinator 
  {larry@nstar.rn.com, ..!uunet!nstar!larry, larry%nstar@iuvax.cs.indiana.edu}

syd@DSI.COM (Syd Weinstein) (01/16/91)

larry@nstar.rn.com (Larry Snyder) writes:
>chris@utgard.uucp (Chris Anderson) writes:
>>I have a TB+ on a Plexus P-95 that is getting about 760cps
>>throughput with HDB uucp.  I'd like to be getting in the 
>>1200-1400 range.  The load on the system is very light, so

>Does the Plexus support hardware flow control?
Yup, quite well, on the ACP.

>Can the Plexus support 19200 without the loss of characters?
Yup, in fact I ran tb+'s on P/60 (ICP, a slower version) at
19200 quite well, and even local tubes at 38400.

Some things to consider...  1.  Make sure that uucp is set to
do rts/cts flow control (this will take a shell script
wrapper, as by default it doesn't) (actually, due to the
short block size and the large buffers available in the ACP,
and the buffers in the modems, it works ok anyway)

Run at 19200 (note at 19200, the ACP only does about 1300-1400 cps
anyway (the characters are not quite back to back sometimes)

Run only a couple of these per ACP and mix other loads on each ACP.
(An acp can do up to 16 ports)

Make sure you are running patch 4 on the acp's to get the best
throughput (1.7 patch 4 or 1.8, no patches needed)
-- 
=====================================================================
Sydney S. Weinstein, CDP, CCP                   Elm Coordinator
Datacomp Systems, Inc.                          Voice: (215) 947-9900
syd@DSI.COM or dsinc!syd                        FAX:   (215) 938-0235