IBM 3274 User Manual page 99

Does this 3274 have the Digital Data Service (DDS)
adapter or X.21 feature?
Y N
007
I
004
Return the Test/Operate switch to Operate.
Are all four 8 4 2 1 indicators now lit?
Y N
006
I
005
A communication problem exists between the 3274
and the host system (no Carrier Detect from the
modem).
Request assistance from your communication service
personnel. When the problem is resolved, all four
indicators will light.
Wait until all four indicators are lit and steady for 1
minute; then continue.
Perform a normal IML. Request the host system operator
to restore this 3274 to the active list, and resume
operation. If the problem recurs, request appropriate
serVIce.
Return the Test/Operate switch to Operate, and perform a
normalIML.
Request the host system operator to restore this 3274 to the
active list, and resume operation. If the problem recurs,
request assistance from your communication network
specialist.
2-24