150-451-104-02, Revision 02
Monitoring the HDSL System
HDU-451 List 4
September 18, 1998
21
Table 8.
Span Status Screen Fields
Field
Description
Time
Time of day when the Span Status was last updated.
Date
Date then the Span Status was last updated.
Alarms
Lists any current alarms. See
“View Alarm History” on page 26
Loopback
Indicates Off or identifies active loopback condition.
Margin
Indicates the excess signal to noise ratio at all HDSL ports, relative to a
Bit Error Rate (BER) of 10
-7
:
•
the first value is the current margin
•
the second is the minimum margin since last cleared
•
the third is the maximum margin since last cleared
Pulse ATTN
Indicates the attenuation of the 2B1Q pulse from the distant end. HiGain
operates with pules attenuations up to 28 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.
PPM Offset
Indicates the relative offset of the crystal oscillator in the HDU-451 from
the HLU crystal oscillator. Any value between ±100 is adequate.
24 Hour ES
The number of one second intervals that contained at least one HDSL
CRC error. This value is a running total from the last 24 hours.
24 Hour UAS
The number of seconds the HDSL loop was out of synchronization in
the last 24 hours.
24 Hour BPV
Seconds
The number of seconds in which at least one bipolar violation was
detected on the DS1 input.
24 Hour UAS
Count
The number of seconds during which the DS1 input signal was absent
(125 or more consecutive 0s).
Frame Type
Type of DS1 framing used on the input stream (SF, ESF, Unframed or
No Activity).
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 ZBTSI 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, which it displays when the
DS1 CODE option is set to AUTO.
