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Kind Readers, This update will take you into July. The surprise is one that *just* surfaced. But first... A word (or two) of about the fine adminstrators of HWG!!! If you have not explored the resouces that they have selflessly put on the Resources and Utilities areas, shame on you!!! CMP Publications thinks enough of those resources that they link them fully five times from their TechWeb site. I spent a couple of weeks going through the Resources area last fall when I joined, Utilities did not exist. A written "pat on the back" that is well deserved!!!
I have told you of the troubles with the technologies. Older phone lines have load coils and bridge taps that block or degrade the signal. The first *trashes* ADSL by blocking it and the second cause signal "reflection" in the line. Another surfaced during trials. Many residences have wiring that, while perfectly fine by building codes of the past, does some very anamolous things to technologies in this family, particularly ADSL. A brief reminder that I have already told you of the crosstalk problems of some xDSL forms. I did forget the SDSL (Symmetric...) member that is mainly for persistent connection in a networked environment, especially in WANs (Wide Area Networks) where the connection is not meant to disconnect. Remember that my T1 discussion wherein many of the telcos, RBOCs (Regional Bell Operating Companies) and LECs (Local Exchange Carriers) now use the HDSL technology to implement T1 on two copper pairs. Well, that is where the advance was. First, let tell you that more vendors are *onboard.* Such names as TI (Texas Instruments), long famed for their DSP (Digital Signal Processing) technologies and patents, Fujitsu Communications and various partnerships abound. Many of the vendors have covered their *butts* by implementing both the CAP (Carrierless Amplitude Phase Modulation) and DMT (Discrete Multi-Tone Modulation) methods to become "full solution" providers. This despite the fact that the ANSI study committee has recommended the DMT method since earlier this year. Okay!!! Earlier this year at the same time that many of the companies involved were submitting papers on DMT and CAP to ANSI; another company, Adtran, Inc., *quietly* submitted a paper on a new technology, HDSL2. Now, a supporting paper has been submitted jointly by ADC Telecommunications, PairGain Technologies and Level One Communications. This is GREAT!!!
Now see what is so exciting about the maturation of this technology??? Equipment will not be available until 1998, but the advent of it has been the reason that the telcos have taken *pause* in their implementation of other xDSL technologies. Just too compelling to think of two wires for high speed access in a time of rapidly dwindling resources. Just take a look at the number of new area codes in the last few years. The resellers are just "getting on board" because it was just too vague in the past. The demand is there and the margins are high, something any business person wants. They are finding it a market they cannot ignore! Talent in the implementation is the biggest stumbling block they have. will get you 260+ articles from CMP if you search all publications; and those links to HWG!! Are two other vendors and the last does not tell of HDSL2 since no equipment yet exists for them to sell! Well, here you are! You are now into July; and if you have been kind or adventurous enough to read my posts, you know more than most of the world. Heck, you know more than most of the professionals that are not directly in the telcom industry, and that last bit scoops many of them. Hope you enjoyed!!! Comments???
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Revised: 07/09/98 Copyright © 1997, 1998