Monitoring System Activity and Performance
152-319-100-02, Revision 02
26
April 21, 2000
H2TU-C-319 List 1 and List 1C
U
SING
THE
P
ERFORMANCE
S
CREENS
TO
V
IEW
P
ERFORMANCE
D
ATA
The Performance screens display:
•
CRC statistics for the HDSL2 or DS1 interface in 31-day, 48-hour, 25-hour, and current history reports.
•
Alarm statistics for the HDSL2 (
) on a
continuous basis.
To access the Performance history screens:
1
Press
to select the Performance screen.
2
Press the
to select either interface (H2TU-C DS1, H2TU-R DS1, H2TU-C HDSL2, or H2TU-R
HDSL2), then press
.
3
Press the
to select the type of statistics (Current, Alarm History, 25 Hour History, 48 Hour
History, or 31 Day History), then press
.
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
for a summary of the HiGain Solitaire loopback
codes and activation methods.
Code type
Type of DS1 line coding used (B8ZS, or AMI).
DS1 ES Count
Errored Seconds—The sum of the ES-L and 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 SES-L and 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.
HG
The loopback was initiated from a HiGain (HG) front panel or by a HiGain maintenance terminal
loopback command.
ID
Circuit identification (ID) number.
LA
Loop Attenuation—indicates the attenuation of the Overlapped Pulse Amplitude Modulation (PAM)
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 Solitaire LA operation
range should be kept under 35 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.
PL
The loopback was initiated by a command embedded in the DS1 data path payload (PL).
PRM
The sum of the PRM-NE and PRM-FE counts.
System Status
The presence or absence of alarms (BER, MARG, LOS, AIS, RAI, LA) is indicated on the lower right
corner of all screens. See
for a list of the front-panel system alarms.
P
SPACEBAR
ENTER
SPACEBAR
ENTER
