Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 310

Configuration Commands
rai — Reports resource availability indicator events. When configured, rai events are not raised and
cleared.
looped — Reports looped packets errors.
scramble
Syntax [no] scramble
Context config>port>tdm>ds1>channel-group
config>port>tdm>ds3
config>port>tdm>e1>channel-group
config>port>tdm>e3
Description
This command enables payload scrambling on channel groups.
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
keepalive
Syntax keepalive time-interval [dropcount drop-count]
no keepalive
Context config>port>sonet-sdh>path>ppp
config>port>tdm>ds1>channel-group>cisco-hdlc
config>port>tdm>ds1>channel-group>ppp
config>port>tdm>ds3>ppp
config>port>tdm>e1>ppp
config>port>tdm>e3>ppp
Description This command sets the keepalive interval.
The no form of this command returns the interval to the default value.
Default
10
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Default rai alarms are not issued
Default
looped alarms are not issued
7750 SR OS Interface Configuration Guide