Section 150-431-114
Release 01
Page 29
TABLE 9. GLOSSARY OF HIGAIN TERMS
Term
Definition
Margins
Indicates the excess signal-to-noise ratio, at either the HRU-412 or HLU 319, List 2D
HDSL ports, relative to a 10
-7
Bit Error Rate. 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
pairs’ 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 28 dB, which corresponds to 196 kHz loss range from 35 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 -200 and +200 is acceptable. 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 bipolar violation 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 in the 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.
*
Consult the factory for operations beyond this normal 35 dB loss range.
