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5.3 Wrap Test
5.3.1 Modelll Wrap Test
• EIA
• V.35
• DDS Adapter
• 1200-bps Integrated Modem
• X.21
The modem wrap test can be initiated by one of two IML
functions (normal IML, ALT2 IML). For the wrappable
modem, the normal IML and the ALT2 IML can initiate
the wrap test. For the nonwrappable modem, the ALT2
IML is used. A modem is considered wrappable if its
circuitry allows it to be wrapped from the DTE.
5.3.1.1 Nonnal IML (wrappable modem)
If the modem is wrappable, the customer should configure
the system diskette as "wrappable modem installed." After
configuration, each time a normal IML is performed, a
modem wrap will be atteJl1pted by the IML tests. (For the
DDS adapter, only the adapter and the communication
cables are tested.) If the wrap test fails, the 8 4 2 1 indica-
tors will display a flashing 0111 code. Additional informa-
tion may also be displayed in the 8 4 2 1 indicators and/or
at the display attached to location AO, depending on the
level of the diskette code. When the 3274 does display an
additional code, the 0111 code
will
blink for 5 seconds
alternately with the other code which will be displayed
continuously for 3 seconds.
The description in this chapter deals only with the codes
indicated at the display. Use the chart below to convert to
3274 codes.
Codes at Display AO
011l - 013
0111 -- 021 or 002
0111-0160rOOl
0110 -
OOS
0110 --- 009
Codes at 8 4 2 I Indicators
0111 - 1101
0111 - 0010
0111 - 0001
0110 -- 0101
0110 - 1001
An indication of 013,021 (X.21 Switched) means "general
modem wrap failure." An indication of 016 means
"modem failed to set clear to send." The EIA cable Test/
Operate switch should be left in the Operate position if the
modem is wrappable. If, during a normal IML, a failure
indica tion of 0110 005 or 0110 009 appears on the display,
the adapter has failed.
If
the wrap test failed, see Note in
paragraph 5.3 .1.2.
5.3.1.2 ALT2 IML (wrappable/nonwrappable modem)
Pressing the IML pushbutton while holding the ALT switch
in position 2 will initiate the wrap test for wrappable and
nonwrappable modems. (For the DDS, X.21 , EIA and
V.35 with nonwrappable IllfH\cms. and Loop adapters,
only the adapter and the COlllJllunication cable are tested.)
The cable Test/Operate switch" should be set to Test. The
cable should also be left plul2l' ,,; into the modem (clocking
is supplied by the modem). I
j
t
he wrap test fails, the only
indication will be a flashing 0111 on the operator panel
operational indicators. The modem wrap test takes approx-
imately 1 minute to complete.
If the modem wrap test is successful, a test is initiated to
check for Carrier Detect by setting the Test/Operate switch
*
to Operate (does not apply to X.2I Switched or loop).
If Carrier Detect is not present, the operational indicators
(8 4 2 1) will display 1000. This indication will remain
until Carrier Detect is detected, at which time the lights will
change to 1111.
Note: If the wrap test fails:
a. If 1200-bps Integrated Modem, check card
G2
switches
for proper settings (see Figures C-l through C-6).
b. Check that the modem power and communication cable
connectors are secure and that the modem is in the nor-
mal operating mode.
c. Change cards A 1 G2, H2.
d. Check that the modem feature options
ill
the modem are
activated for DTE control modem wrap function.
e. Check the internal I/O cable
ill
board positioll Yl, and
the external I/O communication cable for defects. See
line flow Figures
5-3
through 5-5.
f.
Check voltages using MAP A120, entry poillt F.
g. See the procedure for running the wrap test without
the attached modem (paragraph 5.3.2).
5.3.2 Wrap Test without Attached Modelll (X.21
and EIA or V.35 without Clock)
This procedure can be used to further isolate the problem
to the CCA/HPCA or to the modem when the modem wrap
test has failed. In this procedure the modem is not attached
and the internal clock signal in the CCA/HPCA is used in
place of the modem clock signal. A successful wrap test
indicates that the problem is associated with the modem,
and a failing wrap test indicates that the problem is associ-
ated with the CCA/HPCA.
1. Turn off the 3274.
2. Set communication cable Test/Operate switch to Test.
3. Disconnect the cOlllmunication cable frolll the modem.
4. Place jumpers on the 01 A-AI board as follows:
EIA
H2MI0 to G2D09
G2G12 to G2J04
V.35
H2M10 to G2D09
G2F07 to G2J04
G2G 13 to G2G08
X.2i
**
G2G07 to G2J04
H2P06 to G2D09
G2G08 to G2G13
Move card G2 jumper from F to E. See Figure C-I7. _
*Loop and 1200-bps Integrated Modem does not have communica-
tion cable with a Test/Operate switch.
**Card PN 5864683 or future part number.
Chapter 5. Communications Reference Data
5-13
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