Communications Line Flow, Eia - IBM 3274 51C Maintenance Information

Q
;
,~
~
...
CJI
Q
3
3
c
=
g'
o·
a
~
~
~
~
=
()
~
o
~
;-
CJI
~
eCA - With or WIO Clock;
. HPCA
WIO Clock
Card H2
U12
-Data Term Rdy
S10 -Req to Send
502
-Data to Rate Sel
U09
-Sel Standby
505
-Test
S13
.-
-Data Set Rdy
S12 -Clear to Send
....
S04
..
-Carrier Det
U05
....
Ring Ind (Not Usedl
Ull
-Xmit Clk Note 4
Ul0
-Rev
elk Note 4
U04
Xmit Data
U13
:0-
Rev Data
1280-Hz Clock
~
...
...
--.
..
~
Ml0 -0------,------0-
Ground
\
,,-
....
-
See Note 2
I
Line DC Voltage
DC Voltage
Range
Active OV
o
to +O.4V
Inactive +5V +2.4 to +5.SV
Open +1.5V +1 to+2V
Use
H2P08 for ground reference.
Cable Continuity with Wrap Switch in Test
Driver Receiver
EIA Dvr/Rcvr
Card G2
B02
J02
002 G03
B04 J06
B03
G05
-
B05
J07
B13 J09
013 Gl0
B12 J12
012 G13
B07 J04
B08 Jl0
004 G07
Bl0
G04
009
G12
008
008
Names
Data Term Rdy -J02 to Data Set Rdy - J09
Req to Send
*G03 to
Clear to Send *Gl0
. to
Carrier Det
-J12
Xmit Data
-G07 to Rev Data ·G04
Receiver
Xmit~
_ _
-J~to
__
-.l.
RcvClk ·Jl0
·Card No. 14
Figure 5-3. Communications Line Flow, EIA
r---
r---
r - -
r - -
r - -
r - -
r - -
I - -
I - -
H=
a.:
~
~
Board
Conn
Al-Vl
Cable
Pin
C1Ell - 013
C1Bll - 010
C1D13- B12
B1Dll - 007
C1Cll-Dll
C1Dll - 012
B1Bll - DOS
C1A13- B09
A1Dll- 002
C1C13 - Bl1
B1C13 - B06
B1A13 - B04
A1El' - 003
B1El1 - 008
I
See Note 2
Line
DC Voltage
Active
+8V
Inactive -8V
110 Conn
r--
-
~:; ~
20
4
~ '"
~-?<::
23
11 ~~'"
lB
~~)
~~
....
6
...
~
r-~"
5
~
...... 8
~~ ~
22
-
I-~"
15
", 17
r-~
. . . . . .
~:::
2
I- ,
~
..... 3
I- ,
r-~"
7
,.'- -
\
DC Voltage
Range
+3 to +9V
-3 to -9V
Use P2D08 for ground reference.
Notes:
1. Xmit/Rcv Data
Active Voltage.j§
MARK or DATA
Bit ON.
Inactive voltage
or data bit off.
2. Jumper for Wrap
....
....
""
....
\
\
External
Cable
+ Data Term Rdy
+ Req to Send
+ Data Rate Sel
+ Sel Standby
+ Test
+ Data Set Rdy
+ Clear to Send
+ Carrier Det
+ Ring Ind
+ Xmit Clk
+ Rcv Clk
Xmit Data (Note 11
Rcv Data (Note
11
Signal Ground
Internal Cable
PN 5267740
\
\
.-}
Test without
Attached Modem
I From Connector Unit
~_
I
I/O Connector -
(paragraph 5.3.2).
I
-
3. Japan only.
I
I
4. Xmit clock and
"
Rev clock are
not used with
2 3 4
·5 6
7
8
CCA card when
• • • • • • • •
clocking is
0
•
0
• •
0
•
0
--
9
0
•
installed. 14 15 16 17 18 19 20 21 22
• Pins Used
~
:::
~
" ,
...
"
::::
~ ~
r " ,
_
......
....
....
~
~
.::
'"
_
......
~
,
....
" ,
"
,
LJ
Wrap
Switch
Cable with Wrap Switch
PN 1743331 3m (10 h) - Note 3
PN 1743332
6m
(20 ftl - Note 3
PN 1743333 9m (30 ftl - Note 3
PN 1743334 12m (40
ttl -
Note 3
PN 1743531 3m (10
ttl
PN 1743532
6m
(20ft)
PN 1743533 9m (30 ftl
PN 1743534 12m (40
ftl
- -
10 11 12 13
0
•
0 0
•
0 0
23 24 25
\
\
To Modem
Modem
Conn
\
\
\
\
\
\