Wavecom W 4010 User Manual page 24

F1 SPEED CHECK
F2 BAUD RATE SELECTION
F3 MODE RECALL
F4 FORWARD SEQUENCE
F4+F3 REVERSE SEQUENCE
The POL-ARQ is a duplex system with
two transmission
usually operating at a speed of 100
Baud. The system uses the error-
correcting Sitor-ARQ
only one station is sending data,
the other sends
pattern. If errors
F1 SPEED CHECK
F2 BAUDRATE SELECTOR
F3 MODE RECALL
F4 FORWARD SEQUENCE
F4+F3 REVERSE SEQUENCE
The idle condition
recognized by means of the signal's
regular mark/space
40/60 %). H owever,
condition it is neither possible to
synchronize nor to measure the Baud
rate.
This forward
system uses the same alphabet as
the single-channel
1c2c3c4c5c6c7c1c2c3c4c5c6c7c1c2c3c4c5c6c7c1
Idle 1000001111111110000011111111100000111111111
where c are extra error-correcting bits
A steady idling
correcting bits. Errors are displayed with the underline character "_".
frequencies,
alphabet.
an idle bit-
occur, block
is easily
shift (about
i n idle
error correcting
ARQ system.
cannot be decoded
Measure Baud rate
Configure Baud rate
Retrieves the operating mode
go to next operating mode
go to previous operating mode
r e p e t i t i o n
initiated.
The F2 key can be used to change
If the speed, while the F3 key recalls
the operating
operational menu.
Displays the baud rate
Selects Baud rates manually
Redisplay of the mode as well as re-
synchronization
go to next operating mode
go to previous operating mode
Every second bit is used for error
correction
consist of
correcting code not only corrects
single errors,
bursts, in fact error bursts of up
to 1 second can be corrected.
The code scheme is illustrated as
follows:
since the
( R Q ) c y c l e s
mode POL-ARQ
and the characters
14 bits. The
but also
decoder has no
Page 24
a r e
with
error-
error
error-