ABB EDS500 Series Function Manual page 46

DSL Interfaces
Example of the display of DSL interfaces
L i n k u p t i m e i s 0 d a y s 2 3 : 4 4 : 5 7 ( 4 t r a n s i t i o n ( s ) t o u p )
S i g n a l q u a l i t y : 2 6 d B
L i n e l o s s r a t i o : 0 d B
Display
DSL interface 1 is up
line protocol is up
(took 0 days 00:01:02)
Interface speed
Link uptime
4 transition(s) to up
Signal quality
Lineloss ratio
Table 21: Comments on the example of the display of DSL interfaces
Commands to show information and frame statistics of DSL interfaces
< s h o w i n t e r f a c e { b a c k u p - g r o u p 1 | c h a n n e l 0 | c o n s o l e 0 |
c o n s o l e 1 | d s l 1 | d s l 2 | f a s t e t h e r n e t 0 | t u n n e l 0 } >
< s h o w i n t e r f a c e { c h a n n e l 0 | d s l 1 | d s l 2 | f a s t e t h e r n e t 0 |
t u n n e l 0 } f r a m e - c o u n t e r s >
< c l e a r i n t e r f a c e c h a n n e l 0 c o u n t e r s >
2.15.7.2 Interferences and Cable Faults
The signal quality allows conclusions about interferences and cable faults. Even though the
values have a measuring error of 1-2 dB, if both sides of a DSL line show vastly different
values for signal quality then this may point to one-sided disturbances from other signals or
discontiunities in impedance of the line (e.g. due to cable faults).
The following figures which effects (one-sided) interferences and cable faults may have:
1 In this example, transmission without interference leads to a signal quality of 11 dB on
both sides.
SQ: 11 dB
Figure 10: Transmission line without references
2 If another service is transmitted in the same cable but on different wires then this may
potentially cause interference and reduced signal quality on both sides.
46
Description
Interface dsl1 is operating.
Connection to remote location.
Establishing the link took 1 minute and 2 sec-
onds.
Shows the data rate, here 1024 kbps.
Shows for how long the link has been estab-
lished
Shows that since the system powered up, this
DSL line has been negotiated 4 times suc-
cessfully (and has correspondingly been inter-
rupted three times).
Shows the value of the signal quality, refer to
Chapter 2.15.6, "Signal Quality, Line Length
and Data Rate".
Shows the attenuation of the copper line in
dB. A value of 0 dB allows the conclusion that
there is only short distance between the two
stations of the point-to-point connection.
Two-wire copper line
Functions
SQ: 11 dB
1KGT151021 V000 1