R3303-HP HSR6800 Routers Interface Command Reference

87
Default command level
2: System level
Parameters
inverted: Enables user data inversion.
normal: Disables user data inversion.
Usage guidelines
To prevent 7e in valid data from being taken for stuffing characters, HDLC inserts a zero after every five
ones in the data stream, then inverts every one bit into a zero and every zero bit into a one. This ensures
that at least one out of every eight bits is a one. When AMI encoding is adopted on an E1 interface, the
use of data inversion can eliminate the presence of multiple consecutive zeros.
On the CE1 interfaces at two ends of an E1 line, use the same data inversion setting.
Examples
# Enable user data inversion on CE1 interface E1 2/0/0.
<Sysname> system-view
[Sysname] controller e1 2/0/0
[Sysname-E1 2/0/0] data-coding inverted
detect-ais
Use detect-ais to enable alarm indication signal (AIS ) test on an interface.
Use undo detect-ais to disable AIS test.
Syntax
detect-ais
undo detect-ais
Default
AIS test is performed.
Views
CE1 interface view
Default command level
2: System level
Examples
# Enable AIS test on E1 2/0/0 interface.
<Sysname> system-view
[Sysname] controller e1 2/0/0
[Sysname-E1 2/0/0] detect-ais
display controller e1
Use display controller e1 to display information about one or all the CE1 interfaces.