Sending BERT Patterns

The router can send BERT patterns from different layers in the interface stack. For a list of the modules that support bit error rate tests (BERTs), see ERX Module Guide, Appendix A, Module Protocol Support.

To send BERT patterns:

1. Select a controller.
2. Configure a specific layer in the interface to generate BERT patterns.

   For information about BERT patterns, see References.

path ds1|e1 bert

• Use to enable bit error rate tests using the specified pattern at the T1/E1 over SONET/SDH VT layer.
• Unlike other configuration commands, path ds1|e1 bert is not stored in NVRAM.
• Specify one of the following options:
  • 2^11—Pseudorandom test pattern, 2047 bits in length
  • 2^15—Pseudorandom test pattern, 32,767 bits in length
  • 2^20-O153—Pseudorandom test pattern, 1,048,575 bits in length
• Specify the duration of the test in the range 1–1440 minutes.
• Optionally, specify the unframed keyword to overwrite the framing bits.
• Example

  host1(config-controll)#path 12 ds1 1/3/4 bert pattern 2^11 interval 10 unframed

• Use the no version to stop the test that is running.
• See path ds1|e1 bert.

path ds3 bert

• Use to enable bit error rate tests using the specified pattern at the T3 layer.
• Unlike other configuration commands, path ds3 bert is not stored in NVRAM.
• Specify one of the following options:
  • 0s—Repetitive test pattern of all zeros, 00000...
  • 1s—Repetitive test pattern of all ones, 11111...
  • 2^9—Pseudorandom test pattern, 511 bits in length
  • 2^11—Pseudorandom test pattern, 2047 bits in length
  • 2^15—Pseudorandom test pattern, 32,767 bits in length
  • 2^20—Pseudorandom test pattern, 1,048,575 bits in length
  • 2^20-QRSS—Pseudorandom QRSS test pattern, 1,048,575 bits in length
  • 2^23—Pseudorandom test pattern, 8,388,607 bits in length
  • alt-0-1—Repetitive alternating test pattern of zeros and ones, 01010101...
• Specify the duration of the test in the range 1–1440 minutes.
• Example

  host1(config-controll)#path 12 ds3 2 bert pattern Os interval 10

• Use the no version to stop the test that is running.
• See path ds3 bert.

path ds3 t1 bert

• Use to enable bit error rate tests using the specified pattern at the T1 over T3 layer.
• Unlike other configuration commands, path ds3 t1 bert is not stored in NVRAM.
• Specify one of the following options:
  • 2^11—Pseudorandom test pattern, 2047 bits in length
  • 2^15—Pseudorandom test pattern, 32,767 bits in length
  • 2^20-O153—Pseudorandom test pattern, 1,048,575 bits in length
• Specify the duration of the test in the range 1–1440 minutes.
• Optionally, specify the unframed keyword to overwrite the framing bits.
• Example

  host1(config-controll)#path 12 ds3 2 t1 14 bert pattern 2^11 interval 10 unframed

• Use the no version to stop the test that is running.
• See path ds3 t1 bert.

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