PairGain HLU-431, Manual

Page: 53 / 66

Section 150-431-114
Release 01
Page 53
TABLE 19. GLOSSARY OF HIGAIN TERMS
Term Definition
Margins Indicates the excess signal-to-noise ratio, at the HRU-412, HDU-451, or HLU-431, List
1D HDSL ports, relative to a 10
-7
BER. First value is current margin. Second value is
minimum margin since (C)leared last. Third value is maximum value since cleared.
NA means Not Available (loop is not in-sync). The normal range of a typical margin is
from 22 to 6 dB.
Pulse Attenuation Indicates the attenuation of the 2B1Q pulse from the distant end. The HiGain system
operates with pulse attenuation in excess of 30 dB. This value is related to the cable
pair's 196 kHz loss. The pulse attenuation is a more direct indication of the loop
attenuation to the 2B1Q signal than the 196 kHz loss. The normal range of pulse
attenuation is from 1 to 32 dB.
PPM Indicates the relative offset of the crystal oscillator in the HRU-412 from the HLU-431,
List 1D crystal oscillator. Any value between -64 and +64 is adequate. Values outside
this range indicate out-of-tolerance components or excessive temperature drift in critical
components.
HDSL 24 Hours ES
(Errored Seconds) The number of 1-second intervals which contained at least 1 HDSL CRC error. This
value is a running total of the last 24 hours.
HDSL 24 Hours UAS
(Unavailable Seconds) The number of seconds the HDSL loop was out-of-sync.
DS1 BPV Seconds (ES) The number of seconds in which at least 1 BPV was detected on the T1 input.
DS1 UAS Count The number of seconds during which the T1 input signal was absent (125 or more
consecutive “0”).
Frame Type Type of T1 framing used on the input stream (SF, ESF, Unframed or No Activity).
Code Type Type of T1 line coding used (AMI, B8ZS, AMI : ZBTSI or B8ZS : ZBTSI). The latter
two conditions indicate the line code that is being received when the HiGain system is
set to its ZBTSI mode. In either the AMI or the B8ZS conditions, the code type
displays the user-selected code, as opposed to the type of code that is actually being
received. (The user-selected code is displayed when set to Auto mode.)
HLU/Ver w.x-y “w.x” = software version number of the HLU-431, List 1D.
“y” = list number of HLU-431, List 1D.
HRU/Ver a.b-c “a.b” = software version number of the HRU-412. “c” = list number of HRU-412.
HDU1/Ver s.t-u “s.t.” = software version number of the HDU-451 #1.
“u” = list number of the HDU-451 #1.
HDU2/Ver f.g-h “f.g.” = software version number of the HDU-451 #2.
“h” = list number of the HDU-451 #2.