Maintenance
150-319-205-05, Issue 5
24
January 26, 2000
ELU-319 List 5E and List 6E
Span Status Fields, Alarms, and Loopbacks
Table 13
lists the Span Status fields and descriptions.
Table 14 on page 25
lists all possible alarms and their
descriptions.
Table 14 on page 25
lists all possible loopbacks and their descriptions.
Table 13.
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 18 on page 41
.
Loopback
Indicates Off condition or identifies specific active loopback.
Power Level
Indicates the HDSL line voltage in its Low (-140 V) or High (±112 V) state.
Margin
Indicates the excess signal-to-noise ratio, at either the ELU or ERU, relative to a 10
-7
Bit Error Rate.
First value is current margin, second value is minimum margin since last cleared, and third value
is maximum value since last cleared. NA means Not Available. Minimum and maximum margin are
cleared and updated every time the Span Status screen is cleared and every day when the system
clock passes 12:00 p.m. midnight.
Pulse Attenuation (ATTN)
Indicates the attenuation of the 2B1Q pulse from the distant end. The value is related to the 260 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 260 kHz loss. The normal HiGain ATTN operation range is from
0 to 28 dB.
Insertion Loss (INS LOSS)
Indicates the difference in the amount of power received before and after something is inserted
into the circuit (another telephone instrument) or a call is connected. Usually expressed in
decibel/kilometer.
PPM Offset
Indicates the relative offset of the crystal oscillator in the ELU from the ERU or EDU crystal
oscillator. Any value between -100 and +100 is adequate.
24-Hour ES
The number of 1-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 G.703 input over
a 24-hour period.
24-Hour UAS Count
The number of seconds during which the G.703 input signal was absent (125 or more
consecutive 0’s) over a 24-hour period.
(HG)
HG = HiGain. The loopback was initiated by a HiGain front-panel or maintenance terminal loopback
command.
The Status Menu displays a four-character code that identifies the signal being transmitted
or received (where xxx is LLOS, RLOS, LAIS, or RAIS).
RCV (xxxx) - Signal received (xxxx) at the E1 input to either the ELU or ERU.
XMT (xxxx) - Signal transmitted (xxxx) at the E1 output of either the ELU or ERU.