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4-WIRE LEASED LINE 2400 BPS AND 4800 BPS
DATA SET AND LINE PROPAGATION
(INCLUDES ACKNO'M..EDGMENT MESSAGE)
6 BIT--73MS
(2400
BPS), 0 MS (4800 BPS)
8 BIT--79MS (2400 BPS), 0 MS (4800 BPS)
300
39 CHAR SET
180
"\
'\
-
-
--
i\.
1\
\ \
~
\
~
\
47/52 CHAR SET
-
~
" 1\.\
t"
\
\
~
N
63 CHAR SET
)-\
-
- - - -
"
~
'\
285
270
255
240
225
210
195
165
150
135
120
105
90
.,'\
,
,
\.
\
~-
---
"-
' "
\
1\
'\~
"
\
\
\
\
\
\
\
"
. ,
'
\\
I
----
-,
r\
\
r' 1
"
"
'f
8 BIT
(4800
BPS)*
8 BIT
(4800
BPS)*
6 BIT
(2400
BPS)
8
BIT
(2400
BPS)
15
30
45
60
75
90
CHARACTERS PER LINE
lOS
120
135 144
*USE THROUGHPUT FORMULA (FIGURE 7) TO
CALCULATE 6 BIT THROUGHPUT RATE.
Figure 14. IBM 2780 Printer Approximate Throughput Rate -- Four-Wire Leased Line (See NOTE in Figure 7)
message to compensate for the time involved in the
skipping or overflow operation. (See "ESC (Escape)"
under "End-To-End Control Characters" in the
"Data":'Link and End-To-End Control Characters"
section of this manual.
Carriage-Control Tape
I
The carriage-control tape (see Figure 23) has 12
columnar positions indicated by vertical lines. These
22
positions are called carriage-control channels.
Channels 1 through 8 are used when skipping within
the form, and channel 12 is used when overflowing
from form to form. Channels 9, 10, and 11 are
not used.
Holes can be punched in each channel throughout the
length of the tape. A maximum of 132 lines can be
used to control a form, although for convenience the
control tape is slightly longer. Round pre-punched
holes in the center of the tape are engaged by the
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