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Posted by Anthony Bellanga on April 14, 2008, 3:21 pm
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Fred Goldstein wrote:
> The April, 1999 LERG (the oldest one I have) shows dozens of steppers
> still in service, though the LERG isn't always updated when a switch
> is replaced. Bell Canada had a heap of them. Most of the ones in
> the US were at small rural telcos. The Sept, 2002 LERG still has 59
> stepper listings, again of uncertain accuracy, almost all in small
> telcos (including a few CenturyTels). One was in Trumansburg, NY --
> John, when did that get replaced? Two were at Cass County Tel, which
> I think was the one that got into a mob money-laundering scandal.
I highly doubt that there were a many SXS switches in Bell Canada in
1999. I was told that Bell Canada was in a "crash program" to change them
all to digital (remotes) before 2000. Similarly, I doubt that there were
REALLY as many SXS switches as 59 in Sept 2002. The LERG might "show"
that many SXSes, but as you said:
"though the LERG isn't always updated when a switch is replaced."
I took a look at an early 2003 LERG, and yes, there are still CLLIs
with SXS for equipment type, listed in LERG7 (that section is the
"inventory" of switches, default-sorted by LATA, also indicating an
abbreviation for equipment type). But those listed CLLIs with SXS also
had a corresponding CLLI entered right after or right before, for that
same location (ratecenter) and ILEC, with a digital (remote) equipment
type. The CLLI itself was of a form indicating digital or remote.
What happened is that the ILEC or their agent entered the new CLLI for
the new digital or remote switch replacing the SXS switch, in LERG7...
but the ILEC or their AOCN agent never got around to removing the older
SXS switch/CLLI from LERG7. An entry of a distinct CLLI in LERG7 is
necessary before one can reference that CLLI in LERG6 (t section of the
LERG listing NPA-NXX office codes and associated data), LERG7SHA
(switch homing arrangements), LERG9 (Tandem homing arrangements), and
other related LERG sections or files.
I think that since then, Telcordia has made several quality edits to
their BIRRDS database to prevent old data from remaining in LERG7
(the switch inventory) if that switch (CLLI) has NO corresponding
associated data or reference in any other LERG files (sections) such as
LERG6, LERG7SHA, LERG9, etc. But years ago, Telcordia had to "manually"
run individual data reports each and every month to find "old hanging
data" of extinct switches still appearing in LERG7 if that switch had no
such related, referenced data in ther parts of the LERG. That monthly
report was known as the "Dead Switch Society" report, and was emailed to
"offending switch holders" for them to justify a reason for retaining
such extinct switch data if it didn't appear in other reports of the
LERG.
BTW, it wasn't just ILECs and SXS or #5XB or old and now replaced 1AESS.
CLECs which no longer exist might have their old switches/CLLIs still
listed in LERG7, but these no longer exist in real life. Hopefully, the
NPA-NXX office codes in LERG6 that the CLEC had have now either been
removed altogether, or else corrected with the new telco and switch.
So, for MOST of those remaining SXS switch CLLIs in LERG7 in 1999-2002,
cross-reference that CLLI and see if it is associated with any NPA-NXX
office code in LERG6.
As I mentioned in my earlier post in this thread (and I too renamed it
since "How's Pat" isn't applicable -- my renamed post is "Switching
History"), Nantes in Quebec is believed to be the VERY LAST SXS switch
in the North American Dial Network, cutover to a Nortel DMS-10 in
June 2002. I can't speak for any remaining legacy SXS switches in the
PUBLIC telephone network (as opposed to PBXes, museums, private
collector networks connected by VoIP, etc), in parts of the world
outside of Country Code +1.
- a/b
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![re: Steppers [Telecom]](/images/header.jpg)
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