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4. DSL Line Info
Remote Terminal (RT): An RT is a piece of switching/routing equipment that leads back to the CO. They are generally connected by a fiber optic line, but older RTs used T1 lines to connect back to the CO. It's a method of virtually extending the CO equipment out into areas beyond the servicable radius of the CO dslams.
The advertised speed is for the entire transmission. This transmission also includes the protocol information. In the case of SNET they use PPPoE and TCP/IP. Each one of these protocols takes a small chunk of your bandwith. This is why you might only be getting 1200kbps on a 1500kbps line.
It is the default for many routers.
Relative strength of the DSL signal to Noise ratio. 6dB is the lowest dB manufactures specify for modem to be able to synch. In some instances interleaving can help raise the noise margin to an acceptable level. The higher the number the better for this measurement.
6dB or below is bad and will experience no synch or intermittent synch problems
7dB-10dB is fair but does not leave much room for variances in conditions
11dB-20dB is good with no synch problems
20dB-28dB is excellent
29dB or above is outstanding
Measure of how much the signal has degraded between the DSLAM and the modem. Maximum signal loss recommendation is usually about 60dB. The lower the dB the better for this measurement.
20dB and below is outstanding
20dB-30dB is excellent
30dB-40dB is very good
40dB-50dB is good
50dB-60dB is poor and may experience connectivity issues
60dB or above is bad and will experience connectivity issues
CRC Errors (Cyclic Redundancy Check)
CRC is a method of detecting errors in data transmission. A high CRC count in inself is not really cause for alarm. However, any increase in CRCs after your initial connection is established is a problem and usually points to a physical issue somewhere.
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