Table of Contents
Advertisement
D
TR MR RS CS
9600
TM ER CD RD
D=Dial line occupied
R=Ringing (R appears in same
position as D.)
S=Connection secured by security
handshake (S appears in same
position as D. S and D may flash
alternately.)
TR=Data Terminal Ready
MR=Data Set Ready
RS=Request to Send
CS=Clear to Send
TD=Transmit Data
9600, 4800, etc. = Data speed
("idle"—meaning the modem is
off-line—or H-01, H-14, etc., may
also be displayed in the data speed
position; see following text.)
TM=Test mode
ER=Error (poor signal quality)
CD=Carrier Detect
RD=Receive Data
Handshake Display
TD
When two modems establish a
connection, they engage in an
exchange known as a handshake.
While a handshake is taking place,
the modem displays several codes
ranging from H-01 to H-28 in the
lower left corner of the EIA status
screen. A handshake typically lasts
for up to 12 seconds and is
accompanied by various audible
tones.
Checksum Screens
By pressing pushbutton 1 while the
EIA status screen is displayed, you
can access two checksum screens,
one for the main checksum and
one for the data pump transmitter
and receiver checksums. These
checksums provide data intended
for use by servicing personnel. The
checksum screens also show the
software revision levels (which are
also shown on the power-on
screen).
7.6.2 O
QUALITY SCREEN. The quality
screen displays the quality of the
received signal carrier as a numeric
value and as a horizontal bar
graph. A low numeric value
indicates good signal quality. The
best possible signal quality is
indicated when the bar graph
extends all the way to the right
edge of the LCD.
CHAPTER 7: Diagnostics
S
S
THER
TATUS
CREENS
141
Hide quick links:
Advertisement
Table of Contents
