There are frequent conversations about whether using CAT5 or CAT6 data cable for ADSL signals degrades the ADSL signal more than it would be if CW1308 was used.
It seems there is no fit all answer.
An aquaintance of mine was involved with the design of test and measurement equipment during the evaluation and development of the ADSL signalling format. His remit was to provide means to inspect and record the waveform of the ADSL signal at various points along a ciruit route without the test probes affecting the signal. Other people took the waveform data to analyse it.
Some routes were actual exchange to customer pairs through the network and others were simulated in the laboratory or were test cables laid out around the site.
Simulated lines designed for telephony up to 20 kHz ( resistors, capacitors and inductors in a box on the bench ) failed to simulate a line when ADSL was sent through them.
The recovered waveforms from points along the circuit were compared with the waveform injected at the start of the circuit. Both ADSL signal and the data produced from the ADSL signal were recorded.
Replacing a length of cable with a different type of cable did affect the ADSL waveform. In some circumstances there would be an improvement in the "quality" of the ADSL signal while in others the quality would be reduced. The length of the section replaced had a bearing on whether the signal quality was improved or degraded.
A few feet of jumper cable in a street cabinet was seen to have a noticable effect ( visible on the oscilloscope ) on the ADSL signal. The effect was noticable different depending on whether the jumper pair was normal twist, un twisted or over twisted.
CAT5 and CAT6 have very high twist rates. The observations in the street cabinet suggests a short length of cable that has a different twist rate to the rest of the cable route will affect the ADSL waveform. Whether this effect degrades or improves the ADSL signal and / or data rate was not available to my contact.
I conclude that using CAT5 or CAT6 between the NTE 5 and the modem / router may or may not affect the data quality.
From another engineer "" Because the DSLAM adjusts the data rate and ADSL signal to compensate for the line quality there is the possibility that a length of mis-matched cable at the end of the line will influence the operation of the DSLAM such that the data is not affected or possibly improved ""
As I said it is a black art more than a science to get 20Meg of data through a network designed originally for a maximum of 3kHz audio.
It seems there is no fit all answer.
An aquaintance of mine was involved with the design of test and measurement equipment during the evaluation and development of the ADSL signalling format. His remit was to provide means to inspect and record the waveform of the ADSL signal at various points along a ciruit route without the test probes affecting the signal. Other people took the waveform data to analyse it.
Some routes were actual exchange to customer pairs through the network and others were simulated in the laboratory or were test cables laid out around the site.
Simulated lines designed for telephony up to 20 kHz ( resistors, capacitors and inductors in a box on the bench ) failed to simulate a line when ADSL was sent through them.
The recovered waveforms from points along the circuit were compared with the waveform injected at the start of the circuit. Both ADSL signal and the data produced from the ADSL signal were recorded.
Replacing a length of cable with a different type of cable did affect the ADSL waveform. In some circumstances there would be an improvement in the "quality" of the ADSL signal while in others the quality would be reduced. The length of the section replaced had a bearing on whether the signal quality was improved or degraded.
A few feet of jumper cable in a street cabinet was seen to have a noticable effect ( visible on the oscilloscope ) on the ADSL signal. The effect was noticable different depending on whether the jumper pair was normal twist, un twisted or over twisted.
CAT5 and CAT6 have very high twist rates. The observations in the street cabinet suggests a short length of cable that has a different twist rate to the rest of the cable route will affect the ADSL waveform. Whether this effect degrades or improves the ADSL signal and / or data rate was not available to my contact.
It was too much to take when a circuit with an open leg still carried ADSL to the customer in a format that the modem could convert to data
I conclude that using CAT5 or CAT6 between the NTE 5 and the modem / router may or may not affect the data quality.
From another engineer "" Because the DSLAM adjusts the data rate and ADSL signal to compensate for the line quality there is the possibility that a length of mis-matched cable at the end of the line will influence the operation of the DSLAM such that the data is not affected or possibly improved ""
As I said it is a black art more than a science to get 20Meg of data through a network designed originally for a maximum of 3kHz audio.