IBM 5280 Manual page 229

H A
4 S
1
2
COMMUNICATIONS MAP
CBS COUPLER
PAGE 13 OF 13
102
In order to see the delay
expected,
Place the telephone(s) on
hook.
- Connect the CE meter leads TO
THE COUPLER as follows:
Minus to
'Signal
Ground'
<gray)
Plus to 'Coupler Cut Through'
(brown)
Again place a
another
telephone
coupler number.
call
to
from
the
When the coupler telephone
rings, take the telephone off
hook and observe the CE meter
for a +EIA level.
Does 'Coupler Cut Through'
(brown lead) go to a +EIA level
after 1 to 3 seconds of delay?
Y N
103
is in the The problem
coupler.
Have the
call to
customer place a
the telephone
company.
104
105
Place the
hook.
telephone(s) on
Go back to the MDI prompt,
answer 'Y', and follow the
prompts.
The talk/data mode switch is not
wired correctly in the
telephone.
MAP 3012-13
Note: The delay indicates to the
modem that it is being called.
This signals the modem to send
answer tone.
EC840874 PEC839787
MAP 3012-13