DEFINITY Enterprise Communications Server Release 6
Maintenance for R6vs/si
555-230-127 Issue 1
August 1997
Maintenance Object Repair Procedures
Page10-372DATA-CHL (Network Control Data Channel)
10
Data Channel Local Loop Back Test (#111)
This test verifies the integrity of the dual port RAM that is shared between the
software and hardware that composes the DATA-CHL. The dual port RAM is
placed in local loop back mode such that data to be s ent by the DATA-CHL is
instead looped back to be received by the DATA-CHL. The loop back is done
within the dual port RAM, that is, the data is never sent ove r the TDM Bus. The
test checks that the data received by the DATA-CHL is the same as the data that
was sent by the DATA-CHL.
This test actually does more than just verify the integrity of the target DATA-CHL.
Because it is the DATA-CON that actually puts the Dual Port RA M in local loop
back mode and loops the data from the Dual Port RAM back into the Dual Port
RAM, the test also verifies the integrity of the DATA-CON.
If this test aborts or fails, it is impossible to determine from this test alone whether
the target DATA-CHL is defective or if the problem lies with the DATA-CON. The
results of running Tests #107 and #108 on the DATA-CHL can be used to
determine whether the target DATA-CHL is defective.
Finally, recall from the description of that DATA-CHLs 1 and 2 share a common
Dual Port RAM (DPR) and TDM Bus interface hardware and DATA-CHLs 3 and 4
share a common DPR and TDM Bus interface hardware. Thus, if this test finds
that DATA-CHL 1 is defective, then DATA-CHL 2 is likely to be defective and vice
versa. Similarly, if this test finds that DATA-CHL 3 is defective, then DATA-CHL 4
is likely to be defective and vice versa.
NOTE:
If an Error Code is encountered that recommends that an CDR Link, System
Printer Link, PMS Log Printer, Wakeup-Log Printer, and/or PMS Link be
busied out, restore each busied-out link to service according to the
PRI-CDR/SEC-CDR (PRI-CDR Link), SYS-PRNT (System Printer Link),
PMS-PRNT/JNL-PRNT (PMS Printer Link), or PMS-LINK (Property
Management System Link) Maintenance documentation, respectiv ely,
before concluding work on the problem.
PASS The target DATA-CHL, DATA-CON, TN777 Network Control circuit pack , TDM
Bus (TDM-BUS), and Tone-Clock circuit pack (TONE-BD, TONE-PT,
TDM-CLK) are functioning. Connections can be established over the target
DATA-CHL.
Table 10-118. TEST #110 Data Channel Crosstalk Test — Continued
Error
Code Test
Result Description/Recommendation
Continued on next page