Monitoring System Activity and Performance
LTPH-TP-1047-01, Issue 1
12
March 12, 2001
H2TU-R-402 List 5E
3
To initiate a loopdown of all active loopbacks, press the
to select LPDN, then press
or
. When prompted with the message:
Are
you
sure
(Y/N)?
, press
to initiate the loopdown or
to
cancel.
Table 4.
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
for a summary of the HiGain loopback codes and
activation methods.
Alarm type
Indicates type of alarm.
Armed mode
Indicates system is in an armed state for an intelligent repeater 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 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.
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
HiGain 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 alarms (BER, MARG, LOS, AIS, AIS-CI, RAI, RAI-CI, LA) is indicated
on the lower right corner of all screens.
SPACEBAR
ENTER
N
Y
N
