Issue 1, Section 150-231-164
Revision 04
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TABLE 9. GLOSSARY OF HIGAIN TERMS
Term
Definition
MARGINS
Indicates the excess signal to noise ratio, at either the HRU-412 or HLU 231 List
6D HDSL ports, relative to a 10
-7
Bit Error Rate. 1st value is current margin, 2nd
value is minimum margin since (C)leared last, 3rd 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 attenuations 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 32 dB.
PPM
Indicates the relative offset of the crystal oscillator in the HRU-412 from the
HLU-231 List 6D 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 Hour ES
(Errored Seconds)
The number of 1 second intervals that contained at least 1 CRC error. This
value is a running total of the last 24 Hours.
HDSL 24 Hour 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
DS1 input.
DS1 UAS Count
The number of seconds during which the DS1 input signal was absent (125 or
more consecutive “0”).
Frame type
Type of DS1 framing used on the input stream (SF, ESF, Unframed or No
Activity).
Code type
Type of DS1 line coding used (AMI, B8ZS, AMI : ZBTSI or B8ZS : ZBTSI). The
latter two conditions indicate the code type that is being received when the
HiGain system is set to its ZBTS mode. In either the AMI or B8ZS DS1 code
mode, the Code type displays the selected code as opposed to the code type
that is actually being received, which is what is displayed when set to AUTO
code mode.
HLU/Ver w.x-y
“w.x” = software version number of the HLU-231 List 6D. “y” = list # of HLU-231
List 6D.
HRU/Ver a.b-c
“a.b” = software version number of the HRU-412. “c” = list # of HRU-412.
