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Monitoring System Activity and Performance LTPH-UM-1049-02, Issue 2
36 January 9, 2002 H2TU-C-319 List 4E
Table 14. Monitor Screen Descriptions
Field Description
Active Loopback An active loopback is indicated on the lower third of the Monitor screen. Available loopbacks are
indicated by gray text. See Table 22 on page 56 for a summary of the HiGain HDSL2 generic
loopback codes and activation methods.
Alarm Type Indicates type of alarm.
Armed Mode Indicates system is in an armed state and ready for an intelligent repeater (IR) loopback command.
Code Type Type of DS1 line coding used (B8ZS or AMI).
DS1 ES Count Errored Seconds—The sum of the Errored Seconds-Line (ES-L) and Errored Seconds-Path (ES-P)
counts detected on the DS1 input over a 24-hour period. Errors included are: DS1 frame errors,
BPV, and ESF CRC errors.
DS1 SES Count Severely Errored Seconds—The sum of the DS1 Severely Errored Seconds-Line (SES-L) and
Severely Errored Seconds-Path (SES-P) counts over the last 24 hours.
DS1 UAS Count Unavailable Errored Seconds—The number of seconds during which the DS1 input signal was
absent over a 24-hour period.
Frame Type Type of DS1 framing used on the input stream (SF, ESF, or UNFR).
HDSL2 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.
HDSL2 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.
HDSL2 UAS Count Unavailable Errored Seconds—The number of seconds the HDSL2 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 (ID) number.
LA Loop Attenuation—Indicates the attenuation of the Overlapped Pulse Amplitude Modulation
Transmission with Interlocking Spectra (OPTIS) pulse from the distant end. The value is related to
the 196 kHz loss of the cable pair. The loop attenuation is a more direct indication of the loop
attenuation to the OPTIS signal than is the 196 kHz loss. The normal HiGain HDSL2 LA operation
range is from 0 to 40 dB.
LPF Line Power Feed—Indicates the HDSL2 line power is on.
M Margin—The signal-to-noise ratio at all HDSL2 ports, relative to a 10
-7
Bit Error Rate.
MAL Margin Alarm—Indicates the margin on HDSL2 loop has dropped below the threshold (0 to 15dB)
as set by the operator.
HG (or PL) HG displays when the loopback was initiated from a HiGain (HG) front panel or by a HiGain
maintenance terminal loopback command. PL displays when the loopback was initiated by a
command embedded in the DS1 data path payload (PL).
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 “Using the Performance Screens to View Alarm Data” on page 44.