Testing Dch; Dch Tests 100 And - Nortel Meridian Meridian 1 Feature Description And Administration

Testing DCH

DCH tests 100 and 101

This chapter describes the following DCH tests. These tests are supported on
the QPC757, NT6D11AB, NT6D11AD DCHI cards. MSDL card (NT6D80)
tests are shown later in this chapter.
• Test 100: Interrupt generation
• Test 101: Loop-back mode
• Test 200: Interrupt handler
• Test 201: Interrupt handler-to-link interface
DCH tests 100 and 101 are isolated hardware tests. Test 100 checks interrupt
generation on the DCHI card. Test 101 checks the DCHI loop-back
capability. If either test fails, either a faulty DCHI or a contention problem is
indicated. A test failure initiates DCH error messages. See Figure 186.
Tests 100 and 101 must be run in sequential order (tests 200 and 201 may
follow). Established calls stay up, but new calls cannot be placed.
The DCH link must be in the reset state when these tests are run. Reset can be
accomplished when the status of the D-channel is established (EST) or
released (RLS).
To reset:
LD 96
STAT DCH x (responds either EST or RLS)
RST DCH x
If the DCHI is disabled, it must be enabled before reset can be established.
To enable the DCHI:
LD 96
STAT DCH x (responds RST)
ENL DCH x (if a problem caused the disabled state, RLS occurs; if the
disabled state is cleared, status is EST)
To run Test 100 and Test 101 after verifying that the DCH is reset:
TEST 100 x
TEST 101 x
OK appears when test passes successfully.
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