LTPH-UM-1109-01, Issue 1

Monitoring System Activity and Performance

 

 

3To initiate a loopdown of all active loopbacks, press the SPACEBAR to select LPDN, then press ENTER or N . When prompted with the message: Are you sure (Y/N)?, press Y to initiate the loopdown or N to cancel.

 

Table 8. 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 16 on page 44 for a summary of the HiGain HDSL2 loopback

 

codes.

Alarm type

Indicates type of alarm.

Armed mode

Indicates system is in an armed state for an intelligent repeater (IR) loopback command.

BERT Status

Provides BERT Generator status, elapsed time, and BERT results.

Code type

Type of DS1 line coding received or sent (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 detected at 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 seconds 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 loop attenuation at 196 kHz and should be kept under 35 dB.

LPF

Line Power Feed—Indicates the HDSL2 line power is on.

M

Margin—The signal-to-noise (SNR) ratio at all HDSL2 ports, relative to a 10-7Bit Error Rate.

MAL

Margin Alarm—Indicates the margin on HDSL2 loop has dropped below the threshold (0 to 15 dB)

 

as set by the operator.

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 HiGain (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 “Using the Performance Screens to View Alarm Data” on page 32 for detailed

 

alarm information.

 

 

H2TU-C-231 List 2

January 9, 2002

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