| historical upgrade waves left areas stuck without VDSL2 Initial state: CO-ADSL is everywhere. Then my imagining of events:
a1: ADSL to CO-ADSL2+ upgrades within the CO.
a2: CO-ADSL/2+ to IRAD/ADSL2+ hybrid-fiber (1st FTTN) build-outs.
Left mix of: old ADSL, CO-ADSL2+, IRAD/ADSL2+. Then add u-verse TV:
v1 (2007): CO to VRAD/VDSL2 hybrid-fiber (2nd FTTN) build-outs.
v2 (2007): IRAD to VRAD upgrades.
Relative upgrade costs; (excepting a2) still ongoing at low levels today?:
1x: a1, Within CO upgrade to ADLS2+ still cheapest.
10x: a2, But no recent/new build-outs of (obsolete) IRADs?
10x: v1, Highest expense to build-out hybrid-fiber FTTN.
3x: v2, Medium expense to upgrade FTTN IRAD to VRAD.
Neglecting a lot (expansion cycles/clustering, early greenfield FTTN, competition in area, mergers, FTTP, impact of near-by fiber-to-cell-tower...).
Each upgrade occurring only in select areas, leaving areas stuck in the past. Area evaluations influenced by density in CO's service area, average line distances/age, and marketing & demographics predictions of uptake & longevity of new services (esp. TV & triple-play for VDSL2 since 2007).
After an upgrade, an area may be blacklisted against evaluation for future upgrades for a while, until investment is recovered? So last CO-ADLS2+ deployments may have missed initial IRAD build-out wave, or last IRAD build-outs missed initial VRAD upgrade wave? Evaluations not continuous anyway? The more primitive infrastructure or least dense, longest lines have steepest costs to climb, may be evaluated at longest intervals?
Would like FAQ entry about (rumored) how/why past business decisions led to neighborhoods becoming stuck on something less than VDSL2. This thread to solicit inputs/corrections to lead to such. |
 ILpt4UPremium
join:2006-11-12
Lisle, IL
kudos:7
 ·AT&T U-Verse
| A lot of the ADSL2+ IRADs are brand new -- there were not any U-Verse IRADs until the last year or so, and new ones are being turned up regularly, at least in my part of the country
No real knowledge of why the business decision to go IRAD vs VRAD (the cabinets/shelves are identical -- only difference is the Line Cards ADSL2+ vs VDSL2) -- I tend to see IRADs in areas with more businesses -- malls, industrial parks, etc -- I would assume the theory there is the longer reach of ADSL2+ outweighs the higher bandwidth/IPTV support on shorter loops of VDSL2? That and ADSL2+ does not have as stringent of IW requirements -- running Cat 5 thru businesses can be an adventure
That being said, I have seen new IRADs placed in residential areas recently too -- I really have no idea what the theory there is |
| Good info.
Sorry, but looks like I somehow duplicated this topic from earlier in the day: »historical upgrade waves left areas stuck without VDSL2
I've requested mods lock one of them (this one?), to favor the other one, assuming not plausible to merge? |
