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bert-algorithm

Syntax

Hierarchy Level

Release Information

Statement introduced before JUNOS Release 7.4.

Description

Configure the pattern to send in the bit stream during a bit error rate test (BERT). Applies to T1, E3, T3, and multichannel DS3 interfaces, the channelized interfaces (DS3, OC12, STM1), and channelized IQ and IQE interfaces (E1, E3 and DS3).

Note: When configuring CE1 interfaces on the 10-port Channelized E1/T1 IQE PIC, bert-algorithm must be set at the [edit interface ce1-fpc/pic/port] hierarchy level. When configuring CT1 interfaces on the 10-port Channelized E1/T1 IQE PIC, bert-algorithm must be set at the [edit interface ct1-fpc/pic/port] hierarchy level.

Options

algorithm—Pattern to send in the bit stream. There are two categories of test patterns: pseudorandom and repetitive. Both patterns conform to CCITT/ITU O.151, O.152, O.153, and O.161 standards. The algorithm can be one of the following patterns:

• all-ones-repeating—Pattern is all ones.
• all-zeros-repeating—Pattern is all zeros.
• alternating-double-ones-zeros—Pattern is alternating pairs of ones and zeros.
• alternating-ones-zeros—Pattern is alternating ones and zeros.
• pseudo-2e3—Pattern is 2³ – 1.
• pseudo-2e4—Pattern is 2⁴ – 1.
• pseudo-2e5—Pattern is 2⁵ – 1.
• pseudo-2e6—Pattern is 2⁶ – 1.
• pseudo-2e7—Pattern is 2⁷ – 1.
• pseudo-2e9-o153—Pattern is 2⁹ – 1, as defined in the O153 standard.
• pseudo-2e10—Pattern is 2¹⁰ – 1.
• pseudo-2e11-o152—Pattern is 2¹¹ – 1, as defined in the O152 standard.
• pseudo-2e15-o151—Pattern is 2¹⁵ – 1, as defined in the O151 standard.
• pseudo-2e17—Pattern is 2¹⁷ – 1.
• pseudo-2e18—Pattern is 2¹⁸ – 1.
• pseudo-2e20-o151—Pattern is 2²⁰ – 1, as defined in the O151 standard.
• pseudo-2e20-o153—Pattern is 2²⁰ – 1, as defined in the O153 standard.
• pseudo-2e21—Pattern is 2²¹ – 1.
• pseudo-2e22—Pattern is 2²² – 1.
• pseudo-2e23-o151—Pattern is 2²³ – 1, as defined in the O151 standard.
• pseudo-2e25—Pattern is 2²⁵ – 1.
• pseudo-2e28—Pattern is 2²⁸ – 1.
• pseudo-2e29—Pattern is 2²⁹ – 1.
• pseudo-2e31—Pattern is 2³¹ – 1.
• pseudo-2e32—Pattern is 2³² – 1.
• repeating-1-in-4—One bit in four is set to 1; the others are set to 0.
• repeating-1-in-8—One bit in eight is set to 1; the others are set to 0.
• repeating-3-in-24—Three bits in twenty four are set to 1; the others are set to 0.

Default: pseudo-2e3

Usage Guidelines

See Interface Diagnostics, Configuring E3 BERT Properties, Configuring T1 BERT Properties, Configuring T3 BERT Properties, and .

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.