8
Section 61246026L6-5, Issue 2
61246026L6-5B
1
LOSS is typically several dB less than the insertion loss measured at 200 kHz. The LOSS measurement is a better indication of the
loop’s attenuation of the 2B1Q signal than the insertion loss measured at a single frequency. Adtran HDSL can operate on cables with
an excess of 30 dB LOSS.
2
The first number is for the current 15-minute period and the second is the current 24-hour period (Loop 1 and Loop 2 numbers are
displayed).
From the Current System Status screen, type “Z” to
reset the current performance registers to zero on
both the Current System Status and Performance
History screens. A prompt will require user
confirmation to execute the zero register function.
Figures 8 and 8A consolidate current information for
the HDSL, DSX-1, and DS1 interfaces. A key to the
information provided is found in the center of the
screen. Arrows indicate the key applies to both the
HTU-C and HTU-R.
LOSS ................. Pulse Attenuation Measurement
1
SYNC ................ HDSL Loop 1 and Loop 2 Sync
Status
ES 15M/24H ..... Errored Seconds
2
SES 15M/24H ... Severely Errored Seconds
2
UAS 15M/24H .. Unavailable Seconds
2
An indication of Pair Reversal (if present) is given
at the bottom of the first key column. Status and
configuration information for the DS1 and DSX-1
signals is located in the center of the screen near the
bottom.
FRAME ...... T1 Framing Format selected
CODE ......... T1 Line Code selected
LBO ............ Line Build-Out selected (for DSX-1);
Customer Signal of 0 or -15 dB (for DS1)
NIU ............. Network Interface Unit enabled
BPV ............ Bipolar Violations detected
(DSX-1 and DS1)
ES ............... Errored Seconds (DSX-1 and DS1)
SES ............. Severely Errored Seconds
(DSX-1 and DS1)
UAS ............ Unavailable Seconds (DSX-1 and DS1)
Alarms ........ Lists current alarm condition status
A measure of signal quality for each HDSL loop is
displayed in graphic form on the bottom of the
screen. The measure is from 0 (poor signal quality)
to 9 (excellent signal quality). Guidelines for
interpreting the indicators are given below.
0 ........ Noise margin is
≤
0 dB (
≈
10
-7
BER)
1-8 .... Margin measurement above 10
-7
BER in dB
9 ........ Margin is
≥
9 dB (excellent quality) above 10
-7
BER
The HDSL Loopback and Self-Test Option Screens,
illustrated in Figures 10 and 11, may be used to
evoke or terminate loopbacks and self-tests. These
screens also display the status of current loopback
conditions.
The Provisioning Screen, illustrated in Figure 12,
displays current provisioning settings but does not
provide a means for changing the system
configuration. Provisioning changes are only allowed
at the CO end of the circuit.
The Troubleshooting Display, illustrated in Figure
13, is a graphic depiction of an HDSL circuit. The
unit reviews red, yellow, and blue alarm conditions
in the circuit to automatically predict where a fault
is located. Once a fault location is suspected, the
corresponding portion of the circuit on the screen is
highlighted, and a message describing the failure
will appear.
The Alarm History Screen, illustrated in Figure 14,
provides detailed information on the alarm history
of the HDSL and T1 spans. Information provided
includes alarm location, type, first and last
time/date, current status, and count.
The Set Time/Date/Circuit ID menu screen,
illustrated in Figure 15, provides additional
provisioning options. Enter the time parameters as
military time (for example, enter 3:15 p.m. as
“15:15:00”). Enter the date parameters in mm/dd/yy
format. Enter the Circuit ID as a 25-character
alphanumeric string.
Note: If the HTU-R is connected to a HTU-C
that is being controlled by a HFAC unit, the
time, date, and circuit ID should be set via
the HTU-R terminal screen to match the
corresponding data on the network end.
