CopperOptics 150-1312-02 Посібник - Сторінка 12
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Revision 02
Term
MARGINS
PULSE ATTENUATION
PPM
HDSL 24 Hour ES (Errored
Seconds)
HDSL 24 Hour UAS
(Unavailable Seconds)
Copyright © 1996, PairGain Technologies, Inc. PairGain is a registered trademark, CopperOptics and PG-Flex are trademarks
of PairGain Technologies, Inc.
Page 12
TABLE 4. GLOSSARY OF PG-FLEX HDSL TERMS
Indicates the excess signal to noise ratio, at either the COT or RT,
relative to a 10
minimum margin since last cleared, mx is the maximum value since
cleared, and N/A means Not Available. The normal range of a typical
margin is from 22 to 6 dB.
Indicates the attenuation of the 2B1Q pulse from the distant end. PG-
Flex 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 to
32 dB.
Indicates the relative offset of the crystal oscillator in the RT Line
Unit from the COT Line Unit'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.
The number of 1-second intervals that contained at least one CRC
error. This value is a running total of the last 24 Hours.
The number of seconds the HDSL loop was out of synchronization.
Definition
-7
Bit Error Rate. mn is the current margin, cr is the