Документ взят из кэша поисковой машины. Адрес оригинального документа : http://crydee.sai.msu.ru/ftproot/pub/comp/hardware/U.S.Robotics/unofficial/Disconnect-reason.FAQ Дата изменения: Thu Mar 9 16:50:16 1995 Дата индексирования: Mon Dec 24 11:28:24 2007 Кодировка: IBM-866 Поисковые слова: п п п п п п п п п п п

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* Forwarded by Robert Agababyan (2:5020/234)
* Area : RU.USR (Обсуждение модемов и технологий фирмы US Rob)
* From : Robert Agababyan, 2:5020/234 (27 Feb 95 14:02)
* To : All
* Subj : Disconnect reason FAQ
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Hi All!

Most terms used in the display are self-explanatory except for the
following:

Octets:
Compressed data units. If the number of octets is greater than
the number of characters sent, the modems probably used MNP5
compression on an already compressed file, and the result was
expanded data.

Line Reversals:
The number of times HST-mode modems switched the high
and low speed channels.

Blers:
Errors in data and protocol blocks. If there were many block
errors, your receiver may have experienced problems on the line.

Blocks Resent:
These represent blocks the remote modem resent due to
the previous category, Blers.

Link Timeouts:
Protocol detection problems: communications were
severed momentarily, and the modems probably recovered.
This does not indicate the retry timeout.

Link Naks:
Negative acknowledgments (one or more blocks).

Data Compression:
Indicates the type of data compression negotiated
for the call (V42BIS or MNP5) or NONE. A V42BIS
response includes the size of the dictionary and the
maximum string length used, for example, 2048/32.
See Appendix A for more information.

Equalization Long/Short:
Status of S15 bit 0; long if bit 0=0, short
if bit 0=1. Short equalization applies
only to HST modems.

Fallback:
Enabled/Disabled: indicates whether or not the modems
negotiated online fallback during the connection sequence.

Protocol:
indicates the error control protocol negotiated (LAPM,
ST, MNP, NONE) or SYNC for a synchronous call.

Speed:
The last rates at which the receiver/transmitter were operating
before disconnecting.

Disconnect Reason:
Possible reasons the modem hung up are as follows:

A Rootless Tree:
The modem received an invalid V.42 bis (compression)
frame.

Break Timeout:
Incompatible processing of a Break signal occurred.

DISC:
The remote modem sent a V.42 Disconnect frame.

DTR dropped:
The computer or terminal dropped the Data Terminal
Ready signal, terminating the call.

Escape code:
The operator sent the modem the +++ escape code.

Extra Stepup:
The modem received an invalid V.42 bis (compression)
frame.

GSTN (General Switch Telephone Network) Clear Down:
The connection was non-ARQ and DTR was dropped from one side
of the connection, or the DISC frame was corrupted due to
noise.

Illegal Command Code:
The modem received an invalid V.42 bis (compression) frame.

Inactivity timeout:
The modem detected no activity on the line for
the duration specified in Register S19 (default is 0,
timer disabled).

Invalid Codeword:
The modem received an invalid V.42 bis (compression) frame.

Invalid speed:
The modem is set to &N1 or higher, for a fixed
link rate, and the remote modem is not operating at the
same rate.

LD received:
The remote modem sent an MNP error control Link
Disconnect request.

Loop loss disconnect:
The modem detected a loss of current on the
loop connecting it with the telephone company central
office. This usually occurs because the remote modem has
hung up: the central office drops current momentarily
when there is a disconnect at the other end of a call.
Unless Register S38 is set higher than zero, the modem
immediately hangs up at loop loss.

Loss of carrier:
The modem detected loss of the remote modem's
carrier and waited the duration specified in Register
S10 (default is 0.7 seconds).

MNP incompatibility:
The modem is set to &M5 and the remote modem
does not have MNP capability, or there was an MNP
negotiation procedure error.

Retransmit limit:
The modems reached the maximum of twelve attempts
to transfer a data frame without error.

SABME Timeout (Set Asynchronous Balance Mode Extended):
The modems failed this part of V.42 link negotiation.

Unable to Retrain:
After several attempts, disturbances on the phone
line prevented the modems from retraining, and they could
no longer transmit or receive data.

XID Timeout:
The modems failed to negotiate the V.42 Detection
(XID Exchange) phase.

ARA greet you.

№№№ Triangle 555

+++ GoldED 2.43+ :)
+ Origin: ARA Home Node, Mytichshi, Russia (FidoNet: 2:5020/234)
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Hi All!


ARA greet you.

№№№ Triangle 555