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Card and Service Configuration 6-51
Bit Error Rate Testing Through an MGX-SRM-3T3
The MGX 8850 bus structure supports one BERT session per upper or lower bay, so the switch can
run a maximum of two sessions at once. When you specify the target slot through the CiscoView
application or the CLI, the system determines if a BERT configuration already exists in that bay.
After the system determines that no BERT configuration exists in the applicable bay, the display
presents a menu for the BERT parameters.
The CLI commands (whose functions correspond to CiscoView selections) are:
• cnfbert to configure and start a test
• modbert to inject errors into the BERT bit stream
• dspbert to display the parameters and results of the current test
• delbert to end the current test
Note When a BERT session begins, all connections on a line or port go into alarm and return to
normal when the test ends. Consequently, the test may result in other types of traffic (such as AIS).
During configuration, the displayed parameters or menu items depend first on the card type and
whether the test medium is a physical line or a logical port. Subsequent choices are test type, test
patterns, loopback type, and so on. See the Cisco MGX 8850 Wide Area Edge Switch Command
Reference for details on cnfbert and the other BERT commands. The concatenation of menu to
menu is extensive, so this section contains tables of menu selections based on the card types and the
test type.
The test type can be pattern, loopback, or DDS seek. The choice of test type leads to further menu
displays. Following the tables of menu choices, the remaining sections define the parameters in these
menu choices.
• For AX-FRSM-8T1, MGX-CESM-8T1, and MGX-FRSM-2CT3, see Table 6-5 pattern tests and
Table 6-6 for loopback tests.
• For AX-FRSM-8E1 and MGX-CESM-8E1, see Table 6-7 for pattern tests and Table 6-8 for
loopback tests.
• For MGX-AUSM-8T1, see Table 6-9 for pattern tests and Table 6-10 for loopback tests.
• For MGX-AUSM-8E1, see Table 6-11 for pattern and Table 6-12 loopback tests.
Table 6-5 Pattern Test for AX-FRSM-8T1, MGX-CESM-8T1, and MGX-FRSM-2CT3
Test Medium Medium Type Device to Loop BERT Pattern
Port
Port with N timeslots (can also submit to
the DDS seek test)
v54 all patterns
Port with one 64-Kbps timeslot (can also
submit to the DDS seek test)
latch or v54 all patterns
Port with one 56-Kbps timeslot (can also
submit to the DDS seek test)
noLatch
latch or v54
2
9
or 2
11
all patterns
Line n/a in-band/ESF or
metallic
all patterns