Juniper PHYSICAL LAYER - CONFIGURATION GUIDE V11.1.X Configuration Manual page 162

JUNOSe 11.1.x Physical Layer Configuration Guide
idle-character
interface serial
invert data
mru
140
Configuration Tasks
Use to configure the HDLC idle character.
The idle character is sent between HDLC packets.
Specify one of the following idle characters:
flags Sets the idle character to 0x7E
marks Sets the idle character to 0xFF
Example
host1(config-ifs)#idle-character marks
Use the no version to restore the default value, 0x7E (flags).
See idle-character.
Use to specify a serial interface.
Example for unframed E1 interface
host1(config)#interface serial 4/0:1/1/1/1/1
Example for fractional T1/E1 interface
host1(config)#interface serial 4/0:1/1/1/1/1
Example for unchannelized T3 interface
host1(config)#interface serial 4/0:1/1
Example for T3 interface channelized to fractional T1
host1(config)#interface serial 4/0:1/1/10/22
Use the no version to remove the interface.
See interface serial.
Use to enable data stream inversion for the interface.
Enable data stream inversion only if it is turned on at the other end of the line.
Example
host1(config-if)#invert data
Use the no version to disable the feature.
See invert data.