ADC H4TU-C-319 List 1 Line Unit Manuel D’Utilisation

UAS Count

Unavailable Seconds—The number of seconds during which the DS1 input signal was absent over 
a 24-hour period.

Frame and Code Type

ESF

Type of DS1 framing used on the input stream (SF, ESF, or UNFR).

B8ZS

Type of DS1 line coding used (B8ZS or AMI). 

HDSL4 Errors

ES Count

Errored Seconds—The number of 1-second intervals that contained at least one CRC or LOSW 
error. This value is a running total of the last 24 Hours.

SES Count

Severely Errored Seconds—The number of 1-second intervals that contain at least 50 CRC errors 
or one or more LOSW defects. (An LOSW defect occurs when at least three consecutive HDSL 
frames contain one or more frame bit errors.) This value is a running total of the last 24 hours.

UAS Count

Unavailable Seconds—The number of seconds the HDSL4 loop is unavailable. This occurs after 
10 contiguous HDSL SES and is retired after 10 contiguous non-SES seconds. This value is a 
running total of the last 24 hours. 

ID 

Circuit identification number.

INSL

Insertion Loss—The signal loss value for a 196 kHz signal over the cable pair.

LA

Loop Attenuation—Indicates the attenuation of the Overlapped Pulse Amplitude Modulation 
(OPAM) transmission pulse from the distant end. Proper HDSL4 loop operation requires that this 
value be less than 34 dB. This value differs from the insertion loss value of a conventional 196 kHz 
signal.

LPF

Line Power Feed—Indicates the HDSL4 line power is on.

M

Margin—The signal-to-noise ratio at all HDSL4 ports, relative to a 10

 Bit Error Rate.

PL (or HG)

PL displays when the loopback was initiated by a command embedded in the DS1 data path 
payload (PL). HG displays when the loopback was initiated from a HDSL Generic (HG) front panel 
or by a maintenance terminal loopback command.

PRM

The sum of the Performance Report Messaging-Near End (PRM-NE) and Performance Report 
Messaging-Far End (PRM-FE) counts.

System Status

The presence or absence of an alarm condition is indicated on the lower right corner of all screens. 
System: OK indicates that there are no alarms present; System: Alarm indicates the presence of an 
alarm. Refer to 

.