IBM 5280 Technical Newsletter page 136

867
38 LS-SWITCHED OR SNBU-CABLE
DIAGRAM (continued)
Comm
MPU 38LS
Card Card
Line Name Line Type
e
0
-data term ready Transmit E7B02
07B02
-data set ready Receive
E7B13
07B13
-rate sel Transmit E7B04
07B04
-xmit clk Note 1
E7B07
07B07
-rec clk Note 1
E7B08
07B08
-sal standby Transmit
E7B03
D7B03
-ring ind Receive
E7012
07012
-req to send Transmit
E7002
07002
-clear to send Receive E7013
07013
--carrier det Receive E7B12
07B12
-test control Transmit E7BOS
07BOS
-test ind Receive E7010
07010
+xmit line data Transmit E7004
07004
+rec line data Receive E7B10
07B10
data ring gnd
ES008
-SV Power ESBOS
07B06
E7BOS
+8.SV Power
ESB11
E8B11
08B11
-8.S V Note 3
Power
07007
Notes:
1. This line is not used by the 3SLS card.
38LS
Wrap 38LS
38LS Lines
Level 2 Card
(See Note 2)
Probe Points
•
~
+-
~
~
+-
08B13 +ring indicate
(RI)
J
:=J
J
0700S data tip (OT)
Note 4
07006 data tip (OT)
Note 4
08B03 +off hook (OH))
08002 +data modem
ready (DA)
08009 +coupler cut
through (CCT)
08B10 +switch hook
(SH)
data ring (OR)
2. All D03 board pins are at a +5 V level. All DOS pins are signal ground.
3. On the 3SLS card, -S.5 V is used for United States auto-answer only.
Comm
Comm MPU
MPU
Card
Conn
Card
E5J01
J140
Wrap
Conn
•
G
•
Level
3
E8B13 21 22
+-
E700S
07 09
~
E700S
07 09
+-
E8B03
17 04 ~
E8002
1S 20
~
E8009
OS
OS
+-
E8B10
14 OS
+-
23
21
4. This line goes to the 3SLS transmit level attenuators on the communications MPU card.
present, pin E7D05 is jumpered to pin E7D06 on the communications MPU card.
If the attenuators are not
867
Communications Cable Oiagrams 1S1