Hi all,
I have encountered very strange behavior of one of my
SDSL links, namely very stable and good copper line to my customer
( 600 ohms - running 768 kbs) with good noise and attenuation figures
started to be very unstable - by simply floating.
I had Pipeline connecting for 10 sec and disconnecting again..
I run extensive line tests, exchange some copper between
me and CO and finally I went to customer to check the modem.
Modem is OK - I run test with modem connected in my operations
center - perfect, stable connection.
After all it looks like some other similar signal
is interrupting the transmission frequently causing
Pipeline to go Up and Down. But how I can trace this
signal ? From my experience I know that ISDN on the same copper or
close can do this. I ask my telco to measure the line again but form
their
perspective everything is fine. Noise figures are the same as before,
impedance and
isolation readings are excellent, but modem is not running. How can I
isolate the
problem ?
regards
rafal szmidt
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