Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 385

scramble
Syntax [no] scramble
Context config>port>sonet-sdh>path
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.
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
platform 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.
7750 SR OS Interface Configuration Guide
Values 1 — 254 or 0x01 — 0xfe
Interface Configuration
Page 385