ADC HiGain HLU-200 User Manual page 45

150-200-114-03, Issue 03
Term
MARGINS
PULSE ATTENUATION
PPM
HDSL 24 Hour ES
(Errored Seconds)
HDSL 24 Hour UAS
(Unavailable Seconds)
DS1 BPV Seconds (ES)
DS1 UAS Count
Frame type
Code type
HLU/Ver w.x-y
HRU/Ver a.b-c
HDU1/Ver s.t-u
HDU2/Ver f.g-h
HLU-200 List 1D
Table 18. Glossary of HiGain Terms
Indicates the excess signal to noise ratio, at the HRU, HDU, or HLU HDSL ports,
-7
relative to a 10 BER. 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 dB
to 6 dB.
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 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 dB to 28 dB.
Indicates the relative offset of the crystal oscillator in the HRU-412 from the
HLU-200 List 1D crystal oscillator. Any value between -100 and +100 is adequate.
Values outside this range indicate out of tolerance components or excessive
temperature drift in critical components.
The number of 1 second intervals that contained at least 1 CRC error. This value is
a running total of the last 24 Hours.
The number of seconds the HDSL loop was out of sync.
The number of seconds in which at least 1 BPV was detected at the HRU DS1 input.
The number of seconds during which the HRU DS1 input signal was absent (125 or
more consecutive 0).
Type of DS1 framing used on the HRU input stream (SF, ESF, Unframed or No
Activity).
Type of DS1 line coding (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.
"w.x" = software version number of the HLU "y" = list # of HLU
"a.b" = software version number of the HRU "c" = list # of HRU
"s.t." = the software version number of the HDU #1 "u" = List number of the HDU
#1.
"f.g." = the software version number of the HDU #2. "h" = List number of the HDU
#2.
November 22, 1996
Definition
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