IBM 3274 51C Maintenance Information page 108

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HPCA
c..rd H2
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U12
510
S02
U09
S05
503
513
512
S04
U05
Ull
.un
.."
"
./
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X21
Card 02 (Nol.
4)
-Data Term Rdv
B02
-ReQ to Send
002
-Data Rale Sel
B04
J06
-Select Standby
B03 GOS
-Test
B05 J13
New Sync
B09
GOO
r -
G07
CLK
A
-Dala Set Rdy
B131 r -G08
DiogCLK
-Clear to Send
013
I I
G02
-Carrier Det
B12
I L
JOS
Ring Ind
012
L
-G13
-Xmit Clk
B07 [-J04
-Rev Clk
B08 Jl0
Xmit Data
- 004 Not. 2
Rev Data
Bl0 G04
Diag Clock (Note 2) (38.400
HZ)
009
'-0-------_
Ground
008
008
-POR
011
I
,
I
\
-
Bo.rd
Conn VI
C1D13
B1Dll
C1E13
A1E13
C1All
C1B13
A1Dll
C1C13
B1C13
A1El1
B1Ell
c..blo
Pin
B12
007
B1J
BOJ
009
Bl0
002
Bll
B06
003
008
Internal Cable
PN 5267740
-
- ---,
-
r ---+
-
~
~
f--
f+-
~
-
3274
I/O Connector
r - -
.... 23
.... 11
... 12
... 13
..
.... 9
.... 10
,-
... 22
-'
....
....
15
17
L.....-
,,"
\
'"
\
./ \
DC Volt_
DC VOn .. ".
Lin. DC Voltavo
Ronge
Line (Noto31 Range
'"
\
---=-~=-rocVOit:ag;-(
\
Active +OV
o
to +.6V
Active
Inactive +SV
+2.4 to +5.5V
Inactive
Open +1.5V +1 to +2V
Use H2 008 for ground reference.
Notes:
=xtendef cable is required to meet international standard.
Jumper without attached modem (paragraph 5.3.21.
3. Do not attempt to measure DC I/O/rages. Use the following procedure:
s. Disconnect communication cable from DSU.
b. Place communication cable T~st/D~rat~ switch in the Operate position.
e Me6sure resist6nCl! as shown in chart below.
• If
resistance
;s
correct. check communication cable for shorts
and
opens.
• If resistance is incorrect, replace card G2.
From
To Resistonco (Approxim ...
1
G2-G04 G2-J05
10K ohms
---G05 --J06
10K ohms
---G09 --JI3
100 to 150 ohms
---Jl0 --G04
100 to ISO ohms
---J04 ---GI3
100 to 150 ohms
4. Card PN
8564683.
or
higher·/~~
part numbu. is used in later'production
machintn for both switched and nonswirched. Thll card should bll jumpered as
shown in Figurtn C·I6 and C·ll.
\
Va-Vb> .3 .3V t06V
Va-Vb< .3 -3V to-6V
External
Cable
~
Control A
Receive B
Receive A
Transmit A
Transmit B
Signal B
Signal A
Indicate A
Indicate B
Signal Ground
\
\
\
\
\
From Control Unit
1/0 Connector
I
I>
I;
I)
l....J
1 2
3 4 5 6 7 8 9 10111213
0 0 . 0 0 0 . 0 • • • • •
0 . 0 . 0 0 0 0 • • 00
141516171819202122232425
, J
Wrap Switch
Modem Cable with Wrap Test - X.21
PN 5718196 10 It 13m)
PN 5718197 20 It
(6m)
PN 571819830 It 19m I
PN 571819940 It 112m1
e
c:::J1I_
e
EKternal
c..bl. Conn
(Switch End)
r -
..... 10
'-
J
..... 11
... 9
..... 4
.... 13
.... 6
.... 2
.... 5
.... 12
..... 8
L.....--
I
I
J
I
I
I
I
i J
To
Cable
Extender
----,
25·Pin Connector • Pins Used
15-Pin Connector •
Pi~s
Used
,---------------
----- - - -
_ _ ...J
\
.
\~
From End'
~
r
D
II
X.21 Cable • Cable Extender
~
PN 5718195 1 It
Hi·Pin Conn
1 Ft.
c..bl.
Extender
Not. 1
Mod.m
Conn. (DSDI
r---
?
"7
,
.,.
...
~
,
:::
..
...
~
' "
7
L.J
>
10
>
3
>11
>
9
>
4
>
13
>
6
>
2
>
5
>
12
>
8
\
I
I
I
I
I
I
I
I
I
I
I
I
I
I
_______ J
ToX.21
Modem
IS-Pin Conn
Figure 5-8. Communications Line Flow, X.2I Switched and Nonswitched-Domestic and World Trade