# bert

#### Syntax

bert pattern pattern interval time [ unframed ]

no bert

#### Release Information

Command introduced before JunosE Release 7.1.0.

#### Description

Enables bit error rate tests using the specified pattern on T3 interfaces on channelized and unchannelized T3 modules. The no version stops the test that is running.

| Note: The BERT patterns supported can vary depending on the line module and I/O module assembly you are using.

#### Options

- pattern—One of the following test patterns:
  - 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-O153—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...
- time—Duration of the test in the range 1–1440 minutes
- unframed—(available for E1 and T1 interfaces only) if specified, the test bit pattern occupies all bits on the link, overwriting the framing bits; if not specified, the test bit pattern occupies only the payload bits

#### Mode

Controller Configuration