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The Maintenance/Test Circuit Pack (TN771D)
Issue 4 May 2002 9-15 555-233-123
Use the following procedures to exit standalone mode:
1. Remove the 258A Adapter from the Amphenol connector.
2. If the TN771 was installed for this procedure, remove it. Otherwise, reseat
the TN771.
3. Be sure that alarm origination is re-enabled on the Maintenance-Related
System Parameters form if it was disabled there (if it was disabled at login,
it is automatically re-enabled at logoff).
Using Standalone Mode in Packet Bus Fault
Isolation and Correction
When the TN771 is in standalone mode, three commands can be used at the
terminal:
■
ds displays the current state of the Packet Bus leads.
■
dsa toggles auto-report mode on and off. In auto-report mode, the state of
the Packet Bus leads are displayed and the terminal beeps whenever a
change occurs.
■
? displays the available commands.
Figure 9-2 presents an example of a standalone mode display. In the display, an
‘S’ indicates a shorted lead, an ‘O’ indicates an open lead, and a blank indicates
no fault.
Figure 9-2. Example Standalone Mode Display
The information within a standalone mode display is used in the Packet Bus Fault
Correction procedures that follow. The TN771 display indicates the specific leads
on the backplane to examine for bent or damaged pins.
Figure 9-3 on page 9-16
shows the location of the packet bus leads on the backplane as viewed from the
front of the carrier, while
Figure 9-4 on page 9-17 shows the same slot as viewed
from the back of the carrier.
NOTE:
This information is available only from the standalone mode and with an
on-site connected terminal. This information is not available from the
Manager I, and, thus, it is not available remotely. This is not a concern,
inasmuch as this information cannot be used effectively if testing is not on
site.
L L L L L L L L L L H H H H H H H H H H S S S L
P 0 1 2 3 4 5 6 7 8 P 0 1 2 3 4 5 6 7 8 S F B F
_ ____________________________________________________________________________________________________
S S O
Command: