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echo: hs_modems
to: DAN BRIDGES
from: DAVE MUSCATO
date: 1997-05-24 11:37:00
subject: LAP-M Figures

DB>I think with the help of the docs in USRST419.xxx I understand
DB>this display better. Observations:
DB>However if you apply this to the displayed figures above, then
DB>1,003,3742 octets / 128 = 7,842 128+7 data frames. Assigning 100
DB>frames for the connection leaves 2,970 frames unaccounted for.
DB>344 Blers at 6 frames affected/sent/lost per Bler = 2,064 frames.
DB>Still leaves about 900 frames unaccounted for. Any ideas?
Since you understand how to translate the ATI6 info (I don't), before
resetting the modem, ATI11 will provide additional call specific info.
You might also try any of ATY8, ATY7 and/or ATY11 (Y11 returns frequency
and level info).
I have a Courier external V.all/X2 and have only been able to get the Y7
command to provide info when issued in command mode otherwise; the modem
responds with error.
ATY7 info returns as:
Signal Quality  = B9E1
Signal Level    = 4D48
Amplitude Error = 0028
Phase Error     = 7FCC
Gain Hits       = 0000
Timing Offset   = C570
Carrier Offset  = FEF6
OK
I've going round and round with USR since February trying to get a/any
acceptable suggestion or a guess as to why I am frequently having signal
quality problems when connected to a V.34+ Sportster on my IP's system
(running MBBS, 71 lines/30 w/Sportsters).
After relating stats from the ATI6 below one tech was adamant to the
point of rudeness that the problem was unequivocally in my phone line
but she was stifled to explain why these problems do not appear on any
other connections I make.
After talking to the sysop yesterday he finally tells me that the
Sportsters he has (all) have bad chips in them (ROM I ASSume) and that
USR is sending him replacement chips.
Happen about  85% of all (Internet) calls and cps drops down to 12-15 ??
If you can derive from this diag any info which might shed some light on
the problem I'd appreciate it if you'd reply, here or if more convenient
fastlane@mclv.net
Thanks
ati6
USRobotics Courier V.Everything Link Diagnostics...
Chars sent                16125      Chars Received            21124
Chars lost                    0
Octets sent               16125      Octets Received           21124
Blocks sent                 638      Blocks Received             739
Blocks resent              1954
Retrains Requested            0      Retrains Granted              0
Line Reversals                0      Blers                     19330
Link Timeouts               119      Link Naks                   128
Data Compression       NONE
Equalization           Long
Fallback               Enabled
Protocol               LAPM 128/15
Speed                  28800/28800
Last Call              00:53:37
Disconnect Reason is Escape code
OK
ati11
USRobotics Courier V.Everything Link Diagnostics...
Modulation               V.34+
Carrier Freq    ( Hz )   1959/1959
Symbol Rate              3429/3429
Trellis Code             64S-4D/64S-4D
Nonlinear Encoding       ON/ON
Precoding                ON/ON
Shaping                  OFF/ON
Preemphasis Index        7/8
Recv/Xmit Level (-dBm)   23.0/11.6
SNR             ( dB )   565.4
Near Echo Loss  ( dB )   0.0
Far Echo Loss   ( dB )   33.9
Roundtrip Delay (msec)   5
Timing Offset   ( ppm)   -4256
Carrier Offset  ( ppm)   10
RX Upshifts              0
RX Downshifts            0
TX Speedshifts           0
x2 Status                Remote modem is not x2
 -- SRP 2.00 #1621: Today The President Will Make A Major A Dress (?)
--- PCBoard (R) v15.4 (OS/2) 10 Beta
---------------
* Origin: ABSOLUT(e)LY TEMPORARY, Las Vegas, NV +1-702-254-8601 (1:209/232)

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