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Circuit Emulation Service Module for T3 and E3
Bit Error Rate Testing on a T3 or E3 CESM
An active MGX-CESM-T3 or MGX-CESM-E3 can perform a bit error rate test (BERT). Each of
these cards contains its own BERT controller, so BERT sessions can run on any number of these
cards in the system. However, only one user at a time can run BERT on a card. BERT disrupts service
because it requires the tested path to be in loopback mode.
The CLI commands (whose functions correspond to CiscoView selections) appear in the following
list. The correct order of task execution is crucial for obtaining valid results. With the exception of
dspdsx3bert, you must execute the commands in the order they appear in the following list. You can
execute dspdsx3bert before, during, or after a session. Because the order of execution is crucial,
read the command descriptions whether you use the CiscoView application or the CLI.
•
acqdsx3bert determines if another user currently is running a BERT session on the card.
•
startdsx3bert starts a BERT test (after resetting BERT counters).
•
cnfdsx3bert specifies a pattern for the BERT test.
•
moddsx3bert injects multi-rate errors into the BERT bit stream.
•
deldsx3bert ends the current test (and retains the values in the BERT counters). This command
also resets the status of current users that acqdsx3bert detects.
•
dspdsx3bert displays the parameters and results of the current test. You can execute this
command at any time.
See the Cisco MGX 8850 Wide Area Edge Switch Command Reference for command details.
Note
normal when you end the test. Consequently, the test may result in a large number of traps and other
types of traffic (such as AIS).
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Cisco MGX 8850 Installation and Configuration, Release 1.1.00, Part Number 78-6186-02
•
route_priority is the priority of the connection for re-routing. The range is 1–15 and
is meaningful only in relation to the priority of other connections.
•
max_cost is a number establishing the maximum cost of the connection route. The
range is 1–255 and is meaningful only in relation to the cost of other connections.
•
restrict_trunk_type is a number that specifies the type of trunk this connection can
traverse. The numbers are 1 for no restriction, 2 for terrestrial trunk only, and 3 for
satellite trunk only.
•
pcr is the peak cell rate in cells per second (cps). For T3, the maximum is 118980 cps.
For E3, the maximum is 91405 cps.
•
mcr is the minimum cell rate. The range is 1–65535 cells per second.
•
pct_util is the percent utilization in the range 1–100.
When a BERT session begins, all the connections on the line go into alarm and return to
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