PairGain HiGain HDU-451, Руководство пользователя, Страница: 29 / 48

150-451-103-02, Revision 02 Monitoring the HDSL System
HDU-451 List 3 September 18, 1998 21
At this screen you have the following options:
• Type , then press to exit and return to the Main Menu.
• Type , then press to update the information displayed on the
screen.
•
Type , then press to view information for the next available
span.
Table 8 describes the fields of the Span Status screen.
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 27 .
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.