Specifications

4 Message Reference
100
Description
This message is used to collect performance statistics for a given Line Interface Unit
(LIU). A module requesting LIU statistics information is required to complete the
version parameter of the message, request a response, and set all additional
parameter values to zero.
The confirmation message contains a non-zero status in the event of an error. The
statistics can either be read and left unchanged, or read and reset in a single operation
depending on the setting of the status field in the request message.
Parameters
The LIU_MSG_R_STATE message includes the following parameters:
duration
The duration (in seconds) since the statistics were last reset.
bit_errors
A count of the actual number of bit errors detected by the framer device for the LIU.
The precise meaning of this parameter varies depending on the operating mode of the
framer:
— For E1 operating modes, it is the number of errors detected in the frame alignment
word.
— For T1 interfaces operating in D3/D4 frame format, it is the number of framing bit
errors.
— For T1 interfaces operating in ESF format, it is the number of CRC6 errors.
Note: In general, the user should use the errored_seconds and severely_errored_seconds
parameters instead since these parameters provide normalized values that have the same
meaning for all modes of operation.
code_violations
A count of all the line code violations detected on the interface.
frame_slips
A count of the number of frame slips that have occurred on the interface.
oos_transitions
A count of the number of transitions from the in synchronization state to the out of
synchronization state.
errored_seconds
The number of seconds since the statistics were last reset during which the interface
contained errors. An errored second is any second during which the interface is out of
synchronization, or there are frame slips or bit errors.
If the liu frame format is configured as either D4 or E1, with CRC generation disabled,
then line code violations are also included in the errored second count..
severely_errored_seconds
The number of severely errored seconds since the statistics were last reset. A severely
errored second is a second during which the interface is out of synchronization or the
bit error rate exceeds 1 in 1,000.