AT&T 3B2 Off-Line Diagnostic Manual page 474

Phase Descriptions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Phase #19
~
EPORTS - External
see
Interrupts
Phase Name:
Type:
Function:
Tests:
EPORTS - External SCC Interrupts (int2)
Interactive
This phase checks the external looping cable from one port to another on the
EPORTS board.
SCCO
I
I
I
I
I
SCC1
: ________ .J I
____________ .J
SCC2
I I
I I
I I
I I
SCC3
I I I
I ________ .J
I I
____________ .J
All eight port channels are tested for the following interrupts in this phase:
parity error
framing error
CTS changed
DCD dropped
Tests 1 through 4 - check transmission of interrupts from SCCO Channel A
(Port 0) to SCC1 Channel B (Port 3):
Test 1 - parity error.
Test 2 - framing error.
Test 3 - CTS change.
Test 4 - DCD dropped.
Tests 5 through 8 - check transmission of interrupts from SCC1 Channel B
(Port 3) to SCCO Channel A (Port 0):
Test 5 - parity error.
Test 6 - framing error.
Test 7 - CTS change.
Test 8 - DCD dropped.
Tests 9 through 12 - check transmission of interrupts from SCC1 Channel A
(Port 2) to SCCO Channel B (Port 1):
Test 9 - parity error.
Test 10 - framing error.
Test 11 - CTS change.
Test 12 - DCD dropped.
9-30 OFF-LINE DIAGNOSTIC MANUAL