150-388-151-01, Revision 01
Provisioning
HLU-388 List 5A
September 15, 1999
19
lists the Span Status fields and descriptions.
describe alarm and loopback
messages displayed on the Span Status screens.
Table 6.
Span Status Fields and Descriptions
Span Status 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
Loopback
Indicates Off condition or identifies specific active loopback. See
Power Level
Indicates the HDSL line voltage in its Low (-140 Vdc) or High (±112 Vdc) state.
Margin
Indicates the excess signal-to-noise ratio at all HDSL ports relative to a 10
-7
Bit Error Rate.
•
First value is the current margin.
•
Second value is the minimum margin since last cleared.
•
Third value is the maximum margin since last cleared.
•
N/A means that the margin is 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 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 loops at the HDSL line rate of 196 kHz. It is
generated by multiplying the pulse attenuation by 1.25. Normal range is 0 to 35 dB.
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 over a 24-hour period.
24-Hour ES Count
The number of seconds in which at least one error was detected on the DS1 input over a 24-hour
period. Errors included are: DS1 Frame, BPV, and ESF CRC errors.
24-Hour UAS Count
The number of seconds during which the DS1 input signal was absent (175 ±75 consecutive
zeroes) 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 indicate
the code type that is being received when HiGain line coding is set to ZBTSI mode. When set to
AMI or B8ZS, the HLU displays the selected code rather than the code type that is actually being
received.
The Span Status screens shown on the previous page display a four-character code under the
Alarms entry. These codes are described in
The following codes are reported with a RCV or XMT prefix that indicates the signal is being
transmitted or received: LLOS, RLOS, LAIS, or RAIS.
RCV (xxxx) - Signal received (xxxx) at the T1 input to either the HLU or HRU.
XMT (xxxx) - Signal transmitted (xxxx) at the T1 output of either the HLU or HRU.
