US Robotics COURIER - Page 92

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COURIER HIGH SPEED MODEMS
16 During a connection, the modem monitors and stores infor-
mation about link operations. When the call is ended, you
can request a diagnostic summary, as in the following
example.
itli&
USRobotics Courier 14400 HST Dual Standard Link Diagnostics ...
Chars sent
13095
Chars lost
0
Octets sent
5Z38
Blocks sent
&9
B 1 ocks r-esent 0
Retrains Requested
Line Reversals
Link TiHeouts
Data CoHpr-ess ion
U4ZBIS ZEMBl'3Z
Equa 112atl on
Long
Fall back Enabled
Protocol LAPM
Speed
9&001'9&00
Disconnec..;l Rt::!dson is DTR dropped
01{
Char-s Receiued
Octets Received
Blocks Received
Retr-a ins Gr-anted
Biers
Link Haks
1283
513
7
Figure 8.3-Sample Link Diagnostics Screen (A Tl6)
For calls under data compression, the number of characters sent
may be less than the number of octets sent, due to buffering
operations. Line Reversals only applies to HST-mode
operations, when the modems switch the high and low speed
channels. At this time, online fallback is only reported Enabled
in HST mode.
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 MNPS 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.
Queries and Help Screens 8-3