Revision 01
December 22, 1997
150-319-142-01
40
PairGain Engineering - Plant Series
HLU-319 List 4B
H
I
G
AIN
T
ERMS
lists common HiGain terms.
Table 6.
HiGain Terms
Term
Definition
Margins
Indicates the excess signal-to-noise ratio, at either the
HRU-412 List 8B or HLU 319 List 4B 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 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 196 kHz cable
pairs 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 1 to 32 dB.
PPM
Indicates the relative offset of the crystal oscillator in the
HRU-412 List 8B from the HLU-319 List 4B 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 one second intervals containing at least one
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 (Errored
Seconds)
The number of seconds where least one 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 0s).
Frame Type
Type of T1 framing input stream (SF, ESF, Unframed or No
Activity).
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