Table 82: Clock controller commands
Command Action
DIS CC X Disable clock controller.
ENL CC X Enable clock controller.
SSCK X Status of clock controller.
TRCK XXX N Set clock controller tracking where XXX can be: PCK — track
primary clock reference source SCLK — track secondary
clock reference source FRUN — free run mode
NTAK79/NTBK50 power on self-test
When power is applied to the NT
AK79/NTBK50 2.0 Mb PRI circuit card, the card performs a
power-on self-test. The self-tests verify the operation of most of the on-board hardware.
If all the self-tests pass, the upper five LEDs blink simultaneously three times. If any of the self-
tests fail, the LEDs do not blink. Only the OOS LED illuminates. The corresponding error code
is then printed on the TTY.
Self-test error codes
Table 83: Self-test error codes on page 161 lists the self-test failure codes
for the NTAK79/NTBK50 2.0 Mb PRI. These codes can be returned on card power-up in the
form "DTA105 L X" (where X is the failure code), or during a self-test procedure in LD 60 as
"DTI009 L X" (where X is the error code).
Failure codes 1-14 are hardware failures on the NTAK79/NTBK50 card. Codes 15-16 might
be due to carrier span problems or lack of loopback activation at the far end.
Table 83: Self-test error codes
Failure code Associated error
0 Self-test passed.
1 Self-test general failure.
2 LCAs failed to program correctly.
3 8031 code checksum failure.
4 8031 internal RAM failure.
5 8031 external RAM failure.
6 PAD RAM failure.
7 AO7 signaling interface failure.
8 UART (card LAN) failure.
9 CEPT transceiver failure.
System PRI maintenance tools
ISDN Primary Rate Interface Maintenance November 2011 161
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