Alcatel-Lucent 7750 Configuration Manual page 466

Interfaces
Description This command enables SONET/SDH payload scrambling. Scrambling randomizes the pattern of 1s and 0s
carried in a SONET frame. Rearranging or scrambling the pattern prevents continuous strings of all 1s or all
0s and meets the needs of physical layer protocols that rely on sufficient transitions between 1s and 0s to
maintain clocking.
For ATM, this command enables or disables ATM cell-level payload scrambling/descrambling using x43+1
polynomial as defined in ITU-T I.432.1. Scrambling is enabled by default for the ATM path/channel. Note
that this scrambling is done in addition to SONET/SDH frame scrambling/descrambling, which is always
enabled in the framer.
The no form of this command disables scrambling.
Default no scramble
signal-label
Syntax signal-label value
Context config>port>sonet-sdh>path
Description This command sets the C2 byte value. The purpose of this byte is to communicate the payload type being
encapsulated by SONET framing.
Default 0xcf
Parameters value — Specifies the C2 byte value, expressed as a decimal integer or a value in hex format.
Values
trace-string
Syntax trace-string [trace-string]
no trace-string
Context config>port> sonet-sdh>path
Description This command specifies that a J1-path-trace that identifies the circuit is inserted continuously at source. This
can be checked against the expected value by the receiver. If no trace string is entered then a null string is
used.
The no form of this command resets the string to its default.
Default The default J1 value is Alcatel-Lucent XXX YYY (for example, Alcatel 7750 SR) where XXX is the plat-
form name, such as "7750", and YYY is the product name, such as "SR" or "ESS". The value does not
change when the encap-type changes. The J1 string contains all zeros for a non-provisioned path.
Parameters trace-string — Specifies either a string up to 62 bytes for SONET or 15 bytes for SDH. If the string contains
spaces, enclose it in quotation marks.
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7750 SR Interface Configuration Guide