Phone / ADSL Notes

Telus (BC and AB) use VCP/VPI 0/33

Newer Telus connections are all using "Pair Gain System (PGS)" somehow allows higher speeds. Looking at: http://www.strowger.com/adsl-pair-gain.html - looks like this is how they push DSLAM outward.

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What does a demarc look like: http://www.bell.ca/support/PrsCSrvPns_Moving_Wiring_Repair.page?sel=5#

New style - http://www.dslreports.com/forum/r22049839-Locks-On-Bell-Boxes

Old style - http://www.dslreports.com/forum/r22056791-Demarcation-point-wiring-questionsconcerns

The lower the line attenuation, the better.

20bB. and below = Outstanding
20dB-30dB. = Excellent
30dB-40dB. = Very Good
40dB-50dB. = Good
50dB-60dB. = Poor and may experience connectivity issues
60dB and above = Bad and will experience connectivity issues

In general, a higher signal to noise ratio will result in less errors.

6dB or below = Bad and will experience no line synchronisation or intermittent synchronisation problems.
7dB-10dB. = Fair but does not leave much room for variances in conditions.
11dB-20dB. = Good with little or no synchronisation problems
20dB-28dB. = Excellent
29dB. or above = Outstanding

http://www.phoneworks.net.au/Residential_Services/adsl_troubleshoot.php

Newest thing in ADSL is PhyR - physical layer retransmission, it replaces the Reed Solomon error correction (and it's huge overhead) with some nifty new thing... by Broadcom - http://www.broadcom.com/collateral/wp/XDSL-WP101-R.pdf

ADSL can adapt to shorted conductors, and even having only a single conductor. Thus, it's possible for voice to cease, but not ADSL. (I've seen it happen!)

ADSL "1" vs ADSL2 Filters: ADSL2 goes up to 2.2MHz (up from 1.xMHz) - most ADSL filters blocked everything after the voice frequencies, so "usually" they work on ADSL2, but not guaranteed. http://www.dslreports.com/forum/r28004927-Difference-between-a-DSL-filter-and-an-ADSL2-filter

- Good graphic for alarm filter. http://www.dslreports.com/forum/r28004927-Difference-between-a-DSL-filter-and-an-ADSL2-filter

SDSL modems can potentially talk to each other without a CO (or DSLAM). ADSL, can't.
https://ask.slashdot.org/story/03/01/30/1739238/using-dsl-modems-for-point-to-point-connections

Wilcom Filter Ports are labeled from top to bottom:

- Line

- ATU-R modem

- Phone

tags: phone, cat3, demarc, demarcation, telephone, dialup, adsl, troubleshoot, notes