Nortel Networks OPTera Metro 3500 - Manual (Page 98)

2-60 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
Note: Although TBOS mapping assignments are set from the head-end
network element, you can retrieve TBOS from any remote network
element.
The other network elements in the monitored span are mapped to TBOS
display positions of the head-end network element. The order in which
network elements are assigned to the TBOS numbers is arbitrary. All display
numbers, including number one, can be assigned at any time.
The TBOS display is retrieved from the TBOS head-end network element
only. If you try to retrieve the TBOS display from another network element,
the display is blank.
Remote alarm LED indicator
The remote alarm LED at the TBOS head-end network element indicates an
alarm at another network element in the TBOS monitored span. The remote
alarm LED does not turn on if an alarm is raised at a network element that has
not been mapped into the TBOS display.
All network elements in a network should be included in the TBOS display
mapping.
TBOS report format
The report generated by opening the TBOS dialog box shows the TBOS
mapping assignments and the current alarm status of all assigned elements in
the monitored span. In the screen, adjacent to each network element (NE), are
columns containing periods (.), asterisks (*), or question marks (?).
• A period indicates normal status.
• The asterisks under the display header row symbols CR, MJ, MN, E1, E2,
E3, E4, and RM, correspond to alarm conditions at each network element.
These represent critical, major, and minor alarms, the first four
environmental alarms in numeric order, and the remote alarm indicator,
respectively.
• Question marks show that the network element has not been found in the
TBOS traffic flow. This can mean:
— the network element is not functioning
— the network element cannot be reached
— the NE name has been changed but not updated in the TBOS display
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Path trace
Path trace is a 64-byte ASCII string transmitted through the J1 byte of the STS
path overhead (POH). The 64-byte format provides the user the ability to input
a 62-byte ASCII character string.