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Loop-Back Block Type
Run all block types from 1 through 13
1600 phase-encoded (PE) data block
1600 phase-encoded (PE) data block with 1 track in error
1600 PE density identification (ID)
1600 PE tape mark
1600 PE gap
6250 group-coded recording (GCR) data block
6250 group-coded recording (GCR) data block with 1 track in error
6250 GCR data block with 2 tracks in error
6250 GCR density identification (ID)
6250 GCR automatic read adjust burst
6250 GCR automatic read adjust identification (ID)
6250 GCR tape mark
6250 GCR gap
Diagnostic Test 63 (Digital LoopBack Exerciser)
Parameter A
=
density; parameter B
=
tracks selector.
Digital loop back is performed using a data block in the selected density with the
selected tracks turned off. Tracks selector is in the form of XY where X and Y are
combinations of two tracks to disable. Tracks may be specified as 1 through 9 with 0
indicating no tracks.
Diagnostic Test 64 (Tape Unit Initiated Analog Loop-Back)
Parameter A
=
loop-back block type. This test needs a scratch tape.
Loop-back data or a write pattern is generated by the controller card and passed
through the formatting circuit and the tape. Loop-back block type is defined in Test
62.
The operations are not repeated; therefore, tape failures cause errors when running
this test.
Diagnostic Test 65 (Analog LoopBack Exerciser)
Parameter A = density; parameter B
=
tracks selector. This test needs a scratch
tape.
Analog loop back is performed using a data block in the selected density with the
selected tracks turned off. Tracks selector is in the form of XY where X and Y are
combinations of two tracks to disable. Tracks may be specified as 1 through 9 with
0
indicating no tracks.
The operations are not repeated; therefore, tape failures cause errors when running
this test.
B-10
9348 Service Information
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