Page 898 - 5G Basics - Core Network Aspects

2 Transport aspects

The control parameter lom_persistency is equal to the DPU-MIB configuration parameter
LOM_PERSISTENCY.
NOTE – The persistency allows the transmitting FTU to detect the lom defect condition through the indicator bits,
before the receiving FTU leaves the SHOWTIME state.
12.1.4.3.3 Persistent near-end lor defect

A persistent near-end lor defect shall be declared after lor_persistency milliseconds of continuous near-end
lor defect (see clause 11.3.1.3). The control parameter lor_persistency has valid values from 100 to 2 000 in
steps of 100, with a default value of 200.

The lor_persistency defined for the downstream and upstream are denoted as lor_persistency-ds and
lor_persistency-us, respectively.

The control parameter lor_persistency is equal to the DPU-MIB configuration parameter LOR_PERSISTENCY.
NOTE – The persistency allows the transmitting FTU to detect the lor defect condition through the indicator bits,
before the receiving FTU leaves the SHOWTIME state.

12.1.4.3.4 High_BER event
A high_BER event shall be declared whenever any of the parameters listed in Table 12-6 crosses the listed
threshold. These thresholds are configured through the DPU-MIB.
The control parameter reinit_time_threshold has valid values from 5 to 31 seconds in steps of 1 second,
with a default value of 10.
The reinit-time_threshold defined for the downstream and upstream are denoted as reinit_time_threshold-
ds and reinit_time_threshold-us, respectively.
The control parameter reinit_time_threshold is equal to the DPU-MIB configuration parameter
REINIT_TIME_THRESHOLD.

The control parameter low_ETR_threshold has non-zero valid values from 1 to 30 seconds in steps of
1 second, with a default value of 20 seconds. The valid value 0 indicates that no High_BER event shall be
declared based on ETR being below the ETR_min_eoc.
The low_ETR_threshold defined for the downstream and upstream are denoted as low_ETR_threshold-ds
and low_ETR_threshold-us, respectively.
The control parameter low_ETR_threshold is equal to the DPU-MIB configuration parameter
LOW_ETR_THRESHOLD.

Table 12-6 – Conditions for declaring a high_BER event

Parameter Threshold

Number of contiguous near-end SES (see clause 11.4.4.2) reinit_time_threshold
Number of consecutive seconds the ETR is below the minimum low_ETR_theshold
ETR (ETR_min_eoc) after a successful OLR procedure (only if low_ETR_threshold ≥ 1)

Duration of time interval in seconds with consecutive eoc reinit_time_threshold
command time-outs without a single successful response
(through either eoc or RMC)

NOTE – At the FTU-R, no other conditions shall declare a high_BER event. At the FTU-O, no other near-end conditions shall
declare a near-end high_BER event. Declaration by the FTU-O of a far-end high_BER event (e.g., as indicated by the FTU-R in the
upstream indicator bits) is vendor discretionary.

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