IBM 5280 Manual page 244

D
COMMUNICATIONS MAP
1
AUTO ANS1.JER
PAGE 2 OF 7
004
f'1easure the DC voltage between
A-D8D02
'-Data Indicate' and
A-DoDOS ' GN D' •
Is A-D8D02 '-Data Indicate' at
approximately -3.S Vdc after three
ring pulse trains?
Y N
OOS
Ensure that A-D7B02 '-Data
Terminal Ready' is jumpered to
A":"D7DOS 'GND'.
Re-dial the data station from
another telephone.
With a voltmeter (S Vac
scale), measure A-DSBIO
'Current Detection l' and
A-D8Bl3 'Current Detection 2'.
Are both signals pulsing with
the ring signal?
Y N
443
E F G
MAP 3016-2
A-DSD02 '-Data Indicate' is
connected to a 'Transfer Relay'
point in the line plate. When the
machine is in data mode, A-DSD02
'-Data indicate' is approximately
-3.S Vdc; if not, it is open.
A-DSBIO 'Current Detection l' and
A-D8Bl3 'Current Detection 2'
signal levels:
Without ring current
Off: about 1 Vac.
With ring current
On: voltage increases by about 0.3
Vac.
'Curr~nt D~tect;on
l' signal level
can be different from 'Current
Det ect i on 2'.
ECS40S74 PECS397S7
MAP 3016-2