DCH tests
There are four types of DCH tests.
They are:
• DCH test 100
• DCH test 101
• DCH test 200
• DCH test 201
The DCH tests 100 and 101 are hardware tests, while the 200 and 201 test the DCH
software.
DCH tests 100 and 101
DCH tests 100 and 101 are isolated hardware tests. See Figure 10: DCH tests 100 and 101 on
page 62. Test 100 checks interrupt generation on the DCHI. Test 101 checks the DCHI
loopback capability. If either test fails, either a faulty DCHI or a contention problem is indicated.
A test failure initiates DCH error messages.
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.
Testing DCHI hardware
1. Log in to the overlay system. Then, enter LD 96 by entering the command.
LD 96
2. If the DCHI link is disabled, it must be enabled by entering the commands.
STAT DCH N (responds DSBL)
ENL DCH N(if a problem caused the disabled state, RLS will occur; if the disabled
state is cleared, status will be EST).
RST DCH N
3. Place the DCHI link in the reset state (from either the established or Released state)
by entering the commands.
STAT DCH N (responds either EST or RLS)
RST DCH N
4. Activate the first hardware test by entering the command.
TEST 100 N
5. Activate the second hardware test by entering the command.
DCH tests
ISDN Primary Rate Interface Maintenance November 2011 61
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