PairGain 150-1236-54, Руководство пользователя

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Section 150-319-254
Revision 02
Page 17
TABLE 6. GLOSSARY OF HIGAIN TERMS
Term Definition
MARGINS Indicates the excess signal to noise ratio, at either the ELU-319 or ERU-412, relative
to a 10
-7
Bit Error Rate. 1st value is current margin, 2nd value is minimum margin
since (C)leared last, 3rd value is maximum value since cleared, and NA means Not
Available (loops are not synchronized). The normal range of a typical margin is from
6 to 22 dB.
PULSE ATTENUATION Indicates the attenuation of the 2B1Q pulse from the distant end. HiGain operates
with pulse attenuations in excess of 30 dB. This value is related to the cable pair’s
loss at 260 kHz. The pulse attenuation is a more direct indication of the loop
attenuation to the 2B1Q signal than the 260 kHz loss. The normal range of pulse
attenuation is from 1 to 32 dB.
PPM Indicates the relative offset (in parts per million) of the crystal oscillator in the ERU-
412 from the ELU-319’s crystal oscillator. Any value between -64 and +64 is
adequate. Values outside this range indicate out-of- tolerance components or
excessive temperature drift of critical components.
HDSL 24 Hour ES
(Errored Seconds) The number of 1-second intervals that contained at least 1 CRC error. This value is
a running total of the last 24 hours.
HDSL 24 Hour UAS
(Unavailable Seconds) The number of seconds the HDSL loop was out of synchronization.
G.703 BPV Seconds
(ES) The number of seconds during which at least 1 bipolar violation was detected at the
G.703 input.
G.703 UAS Count The number of seconds during which the G.703 input signal was absent (125 or
more consecutive zeroes).
ELU/Ver x.x-yyyy
ERU/ver x.x-yyyy “x.x” = the software version number of the ELU-319 or ERU-412.
“yyyy” = the list number of the ELU-319 or ERU-412.
5. SYSTEM MAINTENANCE MENU SCREENS
5.01 Figure 6 is the Maintenance Terminal MAIN
MENU Screen. Its eight sub-menus provide
many useful provisioning, test and monitoring tools.
Figure 7 shows the ELU-319 SPAN STATUS
Screen.
5.02 Figure 8 shows the SET CLOCK menu.
Both the Time and Date are set with this
menu. Set the hours and minutes, using the military
(24-hour) convention. Setting the seconds is
optional. Enter the date in the sequence and format
shown. The ERU-412 unit can also be set to the
same time and date as the ELU-319 by entering a U
to the “Update Remote” query. All time information
is lost when power is removed. The last date,
however, is retained in NVRAM and reappears when
power is restored.
5.03 Figure 9 shows the SYSTEM SETTINGS
Screen. All 5 user options can be set from
this screen. To change any option, enter its
character key which is shown inside the parenthesis
within each parameter description. This causes the
screen to refresh with the new parameter. After all
parameters have been selected, press E (Exit) then
C (Confirm). The newly selected parameters are
now activated.
5.04 Figure 10 shows the LOOPBACK MENU
Screen for non-Doubler applications.
Loopbacks NLOC, NREM, CLOC and CREM are
available.