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Practical Examples
E1 / ISDN PRI HDB3 (Rx or Tx) on this wire pair (~1024KHz)
No ADSL and POTS available do not test anything
Possibly DC line voltage when E1 repeaters are used
During the synchronization, a modem sends several pilot tones. On the ARGUS 42, every one or two
seconds, strongly varying frequencies are being shown. Upon sync, the frequency displayed is relatively
stable (variations of a couple of KHz).
The greater the data rate, the greater the output power, and the
shorter the line, the bigger is the frequency of the ADSL signal
metered.
This example shows an unbundled loop w/ ADSL 2+
Example – ISDN PRI Service
Example – ADSL 2+ Annex A (very short line, high data rate)
Example – Pilot Tones Sent By An ADSL2+ Modem
36


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