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HLU-231 List 7E September 23, 1998 17
Span Status Fields, Alarms, and Loopbacks
Table 7 lists the Span Status fields and descriptions. Table 8 on page 18 lists all possible alarms and loopbacks,
and their descriptions.
Table 7. Span Status Fields and Descriptions
Field Description
Time Time of day when Span Status was checked.
Date Date when Span Status was checked.
Circuit ID Shows the user-defined circuit ID.
Alarms Presence or absence of alarm conditions. See Table 12 on page 35 .
Loopback Indicates Off condition or identifies specific active loopback. See Table 13 on page 40 .
Margin Indicates the excess signal-to-noise ratio, at either the HLU or HRU, relative to a 10
-7
Bit Error
Ratio. The first value is the current margin, the second is the minimum margin, and the third is the
maximum value. NA means “Not Available.” The minimum and maximum margins are cleared and
updated every time the Span Status screen is cleared and every time the system clock passes
12:00 AM midnight.
Pulse Attenuation (ATTN) Indicates the attenuation of the 2B1Q pulse from the distant end. The value is related to the 196 kHz
loss of the cable pair. The pulse attenuation is a more direct indication of the loop attenuation to
the 2B1Q signal than is the 196 kHz loss. The normal HiGain ATTN operation range is from 0 to
28 dB.
Ins Loss Indicates the approximate insertion loss of the various loops at the HDSL line rate of 196 KHz. It
is generated by multiplying the PULSE ATTN by 1.25.
PPM Offset Indicates the relative offset of the crystal oscillator in the HLU from the HRU or HDU crystal
oscillator. Any value between -100 and +100 is adequate.
24-Hour ES The number of one second intervals that contained at least one CRC error. This value is a running
total of the last 24 Hours.
24-Hour UAS The number of seconds the HDSL loop was out of sync.
24-Hour BPV Seconds The number of seconds in which at least one bipolar violation was detected on the DS1 input over
a 24-hour period.
24-Hour UAS Count The number of seconds during which the DS1 input signal was absent (125 or more consecutive
0s) over a 24-hour period.
Frame type Type of DS1 framing used on the input stream (SF or ESF).
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 ZBTS1 mode. In either the
AMI or B8ZS DS1 code mode, it displays the selected code as opposed to the code type that is
actually being received.