Maintenance
4-5
3360-A2-GB20-20
December 1996
HDSL Loop Performance
Use the HDSL Loop Performance branch to view the
signal quality and loop loss messages for each loop on the
local E1 NTU.
Table 4-3
lists these messages.
To display HDSL loop performance,
1. From the top-level menu screen, select Stat.
F1
E1 HDSL NTU
Stat
Test
Cnfig
F2
F3
2. From the Status screen, select HDSL.
F1
Status:
HDSL DevHS STest
F2
F3
HDSL messages appear on Line 2 of the LCD.
The E1 NTU is polled for current status every ten
seconds. If the status has changed from the last
poll, the HDSL screen is updated.
3. Use the scroll keys, to scroll additional HDSL
messages onto the LCD.
F1
HDSL:
Lp1 SigQ=
xx
F2
F3
Table 4-3
HDSL Loop Performance Messages
Message
Description
Lp1 SigQ=
xx
The loop 1 signal quality value (
xx) is 0 to 10. A value of 10 indicates the noise margin is 9 dB or
more above the margin needed to produce a bit error rate of approximately 10
-7
. The values of 2 to
9 indicate noise margins of 1 to 8 dB above this margin. A value of 1 indicates the noise margin is
less than or equal to the margin needed to produce a bit error rate of approximately 10
-7
. A value of
0 indicates the loop is out of synchronization or the noise margin is unavailable.
Lp2 SigQ=
xx
The loop 2 signal quality value (
xx) is 0 to 10. (See the Lp1 SigQ description above.)
Lp1 Loss=
xx
The loop 1 loss value (
xx) is 0 to 40. The value indicates an approximation (+/– 2 dB) of the loss
that the E1 NTU detects at the interface to loop 1. Due to bridge taps on the loop, this value could
be different at each end of the loop. (Values above 40 are invalid.)
Lp2 Loss=
xx
The loop 2 loss value (
xx) is 0 to 40. (See the Lp1 Loss description above.)
