PairGain HLU-231, Руководство пользователя

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Section 150-231-134
Revision 01
Page 28
TABLE 12. GLOSSARY OF HIGAIN TERMS
Term Definition
MARGINS Indicates the excess signal to noise ratio, at either the HLU or HRU, 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, and NA means Not Available. 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. HiGain 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 from 1 to 32
dB.
PPM Indicates the relative offset of the crystal oscillator in the HRU-412 from the HLU-231’s
crystal oscillator. Any value between -64 and +64 is adequate. Values outside this
range indicate out of tolerance components or excessive temperature drift of 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’s).
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 HiGain is set to its
ZBTS mode. In either the AMI or B8ZS DS1 code mode, it displays the selected code.
In the AUTO mode, it displays the code being received.
Ver W.xL
Ver a.b
“wx” = the software version number of the HLU.
“ab” = the software version number of the HRU.
“y” = the list number of the HLU.
“c” = the list number of the HRU.