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Glossary of Terms
Glossary-3
Glossary of Terms
Margins
Indicates the excess signal to noise ratio, at either the COT or RT, relative to a 10
-7
Bit
Error Rate. cr is the current margin, mn is the 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.
Pulse Attenuation 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 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 RT Line Unit from the COT
Line Unit’s crystal oscillator. Any value between -64 and +64 is adequate. Values out-
side this range indicate out of tolerance components or excessive temperature drift of
critical components.
HDSL 24 Hour ES The number of 1-second intervals that contained at least one CRC error. This value is a
running total of errored seconds (ES) for the last 24 Hours.
HDSL 24 Hour
UAS The number of seconds (unavailable seconds) the HDSL loop was out of synchroniza-
tion.