User guide

For a list of supported algorithms, enter a ? after the bert-algorithm statement; for

example:

[edit interfaces ce1-0/0/0 e1-options]

user@host# set bert-algorithm ?

Possible completions:

pseudo-2e11-o152 Pattern is 2^11 -1 (per O.152 standard)

pseudo-2e15-o151 Pattern is 2^15 - 1 (per O.151 standard)

pseudo-2e20-o151 Pattern is 2^20 - 1 (per O.151 standard)

pseudo-2e20-o153 Pattern is 2^20 - 1 (per O.153 standard)

Documentation

Configuring T1 BERT Properties•

• Interface Diagnostics on page 85

• Interface Diagnostics Operational Mode Commands on page 92

Configuring the E1 Frame Checksum

By default, the E1 interface supports a 16-bit checksum. You can configure a 32-bit

checksum, which provides more reliable packet verification. However, some older

equipment might not support 32-bit checksums.

To configure a 32-bit checksum, include the fcs 32 statement at the [edit interfaces

interface-name e1-options] hierarchy level:

[edit interfaces interface-name e1-options]

fcs 32;

To return to the default 16-bit frame checksum, delete the fcs 32 statement from the

configuration:

[edit]

user@host# delete interfaces e1-fpc/pic/port e1-options fcs 32

To explicitly configure a 16-bit checksum, include the fcs 16 statement at the [edit

interfaces interface-name e1-options] hierarchy level:

[edit interfaces interface-name e1-options]

fcs 16;

Documentation

fcs on page 45•

Configuring E1 Framing

By default, E1 interfaces use the G704 framing mode. You can configure the alternative

unframed mode if needed.

To have the interface use the unframed mode, include the framing statement at the [edit

interfaces interface-name e1-options] hierarchy level, specifying the unframed option:

[edit interfaces interface-name e1-options]

framing unframed;

Chapter 2: E1 Interfaces