IBM 5280 Manual page 217

5285 COMMUNICATIONS MAP
AUTO ANSWER COUPLER
PAGE
1 OF 13
ENTRY POINTS
FROM
I
ENTER THIS MAP
-------+----------------------
MAP
I
ENTRY PAGE STEP
NUMBER
I
POINT NUMBER NUMBER
-------+----------------------
3010
I
A 1 001
001
(ENTRY POINT A)
USE THIS MAP TO FIND PROBLEMS IN
THE LOCAL 38LS INTEGRATED MODEM OR
LOCAL AUTO ANSWER TYPE COUPLER
(CBS) BY USING ANOTHER TELEPHONE.
Before continuing, verify that
the connections from the modem
to the
couple~
are correct (see
color code chart on the right).
Ensure that the test switch (if
present) on the CBS type coupler
is in the normnl position.
When measuring EIA levels,
select the 60 Vdc scale on the
CE meter to prevent meter
damage.
Place the
+/-
DC switch on the
CE meter to the
+
DC position.
The meter lead connections will
be indicated by the MAP
questions so that the expected
signal will deflect the meter in
a positive direction.
Place the telephone(s) on hook.
Some telephones have a Talk/Data
(Step 001 continues)
Copyright IBM Corp 1980
MAP 3012-1
EXIT POINTS
EXIT THIS MAP
I
TO
---------------+--------------
PAGE STEP
I
MAP ENTRY
NUMBER NUMBER
I
NUMBER rOINf
---------------+--------------
3 009 0600 A
6
039
0600 A
7 055 0600
A
9 067 0600 A
11
092 0600
A
10
079
0600
A
11 087 0600 A
4 026 0600 A
7 050 0600 A
***
LINE NAMES AND COLOR CODES.
***
Lines are listed from
left-to-right as they appear when
looking at the coupler.
'Switch Hook'
=
Red
'Signal Ground'
=
Gray
'Data Modem Ready'
=
Yellow
'Coupler Cut Through'
=
Brown
'Off Hook'
=
Blue
'Ring Indicate'
=
Violet
'Data Tip'
=
White
'Datfi Ring'
=
Black
NOTES:
'+ EIA levels' are +3 to +25 Vdc
when measured to 'Signal Ground'.
'- EIA levels' are -3 to -25 Vdc
when measured to 'Signal Ground'.
All above coupler connections
except 'Data Tip' and 'Data Ring'
have active levels which are at
'+
EIA levels.'
EC840S74 PEC839787
MAP 3012-1