AT&T Pub 83401

[Dwight Hunnicutt]

All-

Anybody know where to find AT&T Pub 83401?  Global and AT&T don't have
it...I'm looking for a place to purchase to document. 

Thanks,
Dwight

attn: TIES users

[Dwight Hunnicutt]

Any TIES users / ITU Sector Members have access to this document on the ITU
website?

http://www.itu.int/itudoc/itu-t/com15/dcontr/01-04/dc-feb01/029.html

[COM15-D029] Centillium Communications, Texas Instruments, ADC
Telecommunications, Ikanos Communications(Q4/15): G.voice: Potential
Mechanisms to Transport Channelized Voice Signaling and Data Across the ADSL
STM-TC

Thanks

Dwight


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SBC BSP 802-001-180MP

[Dwight Hunnicutt]

Anyone know where to obtain a copy of SBC BSP 802-001-180MP (their grounding
and bonding spec)? thanks

Dwight


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RE: AT&T 54014

[Dwight Hunnicutt]

> Anyone know if AT&T's website has AT&T 54014 (ACCUNET T45) available?
> Global doesn't seem to have it. thanks
> 
> Dwight
> 

Wiltron 9361B

[Dwight Hunnicutt]

Test folks-

Anyone out there have a Wiltron 9361B signaling test set?  Does the manual
include calibration instructions?  We have a unit with no manual, and wonder
if it's worth having it calibrated.  It comes in handy when doing dial-pulse
compatibility testing. Thanks

Dwight


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RE: Probe Kit

[Dwight Hunnicutt]

Darrell-

You can pick up a set online for $560...I haven't found equipment houses
that rent it, since it's a low-dollar item...they just tell you to buy a set
from EMCO:

http://www.emctest.com/emchtm/7405.cfm?model=7405

Dwight

-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: Wednesday, May 16, 2001 3:47 PM
To: Darrell Locke; 'EMC forum' (E-mail)
Subject: Re: Probe Kit



The set only costs about $750 with the preamp, per my recollection (maybe a
few years old).  About $300 w/o the amp.  And they aren't individually
calibrated, they are troubleshooting tools.  You could easily build your
own.

--
>From: Darrell Locke 
>To: "'EMC forum' (E-mail)" 
>Subject: Probe Kit
>Date: Wed, May 16, 2001, 3:51 PM
>

>
> To All,
>
> Does anyone know where in the US I can rent an EMCO 7405 Probe Set.  I
have
> been trying many rental companies ( such as Telogy), and they either don't
> stock them or are out.
>
> Much appeciated,
>
> Darrell Locke
> Advanced Input Devices
>
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RE: NEBS secondary protectors

[Dwight Hunnicutt]

Jim! are you out there??  Grace us with your wisdom...

-Original Message-
From: Don House [mailto:dho...@excelsus-tech.com]
Sent: Wednesday, May 02, 2001 10:47 AM
To: dwight.hunnic...@vina-tech.com
Subject: RE: NEBS secondary protectors


Check with Jim Wiese at ADTRAN.  He knows ALOT about this subject.

Don

Don Robert House
Sr. Member Technical Staff
Excelsus Technologies, Inc.
2875 Loker Avenue East
Carlsbad, CA 92008-6626
(760)918-2552 Office
(760)476-1519 FAX -Original Message-
From: Dwight Hunnicutt [mailto:dwight.hunnic...@vina-tech.com]
Sent: Wednesday, May 02, 2001 9:58 AM
To: Emc-Pstc@Ieee. Org (E-mail)
Cc: Nebs@World. Std. Com (E-mail)
Subject: NEBS secondary protectors


NEBS folks-

Anyone know of external secondary protectors that can be installed outside
of one's product to pass GR-1089 lightning and power cross testing?  That
is, if we don't have room on our boards for the fuse/sidactor circuitry, I
understand a company can specify a certain protector be installed with the
product to meet the requirement.  Any experience doing this?  thanks

Dwight

NEBS secondary protectors

[Dwight Hunnicutt]

NEBS folks-

Anyone know of external secondary protectors that can be installed outside
of one's product to pass GR-1089 lightning and power cross testing?  That
is, if we don't have room on our boards for the fuse/sidactor circuitry, I
understand a company can specify a certain protector be installed with the
product to meet the requirement.  Any experience doing this?  thanks

Dwight

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SDSL vs. FCC

[Dwight Hunnicutt]

SDSL folks-

Certainly there will be a day where FCC has published rules for SDSL, HDSL,
ADSL, and any other xDSL, but does it behoove a manufacturer to bother with
the whole testing/approval/FCC waiver process at this point?  For
manufacturers the already have xDSL products on the market, will they be
required to go through FCC Registration once the rules are published? 

As snipped from a third-party test house quote, can anyone support or deny
the below statement?

Dwight Hunnicutt
VINA Technologies, Inc.



SDSL was not required to be tested to FCC Part 68 requirements last year or
even today.   However, it will be required for SDSL lines any day now.   We
are waiting for FCC to
announce the requirement. If we are doing the Canadian testing for SDSL now,
the additional FCC requirements are much less. Your choice, but keep in
mind, that this will be a
requirement.  Most likely before the testing on your product is completed
for Canada.


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NEBS/telco LED alarm color

[Dwight Hunnicutt]

All-
Our system test guys are concerned that we don't vary our T1 card indicator
LED color to distinguish between minor, major, and critical alarms. I recall
a Bellcore spec that says we have to do this. Can anyone help me track down
the spec reference for this? thanks
Dwight



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ITU-T H.248

[Dwight Hunnicutt]

Anyone know where to obtain a draft copy of the H.248 spec?  The ITU-T
website says "To Be Published" and a "06/00" date, but doesn't say when
it will really be available...

Thanks

D
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T1E1.418-2000

[Dwight Hunnicutt]

Anyone know where to obtain a draft copy of the new HDSL2
Interoperability standard T1E1.418-2000?  I believe the document is
still undergoing final revisions, but a recent draft copy would be a big
help. Thanks...

D
-- 
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  DWIGHT HUNNICUTT   Sr.Compliance Engineer
 
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 510-771-3349  520-244-2721 fax
 www.vina-tech.com
  _

T1.403 tech rpt

[Dwight Hunnicutt]

Anyone know where to obtain a copy of the "T1 Technical Report No. 12,
entitled: 'DS1 ESF data link application guidelines', 1991", as
referenced in footnote 14 on page 18 of ANSI T1.403-1995?  ANSI's
website didn't seem to offer much help...thanks

Dwight
-- 
  _________

  DWIGHT HUNNICUTT   Sr.Compliance Engineer
 
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  _

Re: Y2K glitch

[Dwight Hunnicutt]

gee...no one can take a joke these days...lighten up, Hungarian ATM
wonks...laugh a little every now and then...



"Crabb, John" wrote:
> 
> As the worlds "No. 1" manufacturer of ATMs, and probably the manufacturer
> of the ATM in question, I have received the following information from our
> people in Hungary : -
> "The scanned ATM receipt is NOT REAL, the date on it  had been manually
> altered, but it is not a good joke, it is a serious assault to OTP, and they
> have
> already taken legal actions against an anonymus person, who made this and
> put it on the Internet."
> 
> Possibly we should be more careful about circulating information which
> could be considered defamatory. However, as I always say, "I am not a
> lawyer !" (Safety engineers don't get paid that much !!!)
> 
> Regards,
> John Crabb, Development Excellence (Product Safety) ,
> NCR  Financial Solutions Group Ltd.,  Kingsway West, Dundee, Scotland. DD2
> 3XX
> E-Mail :john.cr...@scotland.ncr.com
> Tel: +44 (0)1382-592289  (direct ). Fax +44 (0)1382-622243.   VoicePlus
> 6-341-2289.
> 
> > -Original Message-
> > From: Ken Javor [SMTP:ken.ja...@emccompliance.com]
> > Sent: 06 January 2000 19:21
> > To:   emc-p...@majordomo.ieee.org
> > Subject:  FW: Y2K glitch
> >
> > Here's a little (real) Y2 K glitch from Hungary.  The attached picture is
> > of
> > an automatic teller machine receipt.  The date is circled in orange, as is
> > a
> > proud disclaimer beneath stating that the OTP Bank's ATMs are Y2K
> > compliant.
> > Enjoy! << File: OTPy2k.jpg >>
>

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impact /probes

[Dwight Hunnicutt]

Mech testers-

Anyone know of sources for the UL1950 Impact Ball (500g, 50mm dia.)?
(I know of one online source, but $150 for a ball?!?  How about a
ball-bearing shop?)

Also, how about a source for the UL1950:
Test Pin (Fig. 20)
Telecom Test Probe (Fig. 16)

thanks
D
-- 
  _

  DWIGHT HUNNICUTT   Sr.Compliance Engineer
 
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GR-505

[Dwight Hunnicutt]

GR-303 experts:

According to GR-303, the GR-505 spec has a section 3.1.1 entitled
"Excessive Origination Protection".  This specifies the maximum ABCD bit
transition rate that a 303-compliant RDT needs to support. It would sure
be nice to know what this number is.

Anyone have the number at their fingertips? thx

D
-- 
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  DWIGHT HUNNICUTT   Sr.Compliance Engineer
 
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 T  E  C  H  N  O  L  O  G  I  E  S
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  _

Re: CISPR 24

[Dwight Hunnicutt]

how about a website to download EN55024?


"Mowbray, John H" wrote:
> 
> Gary
> 
> The IEC maintains a webstore where you can download an electronic copy. You
> need a credit card to order. (http:\\www.iec.ch)
> 
> Another source is Global Engineering Documents in Colorado.  (800) 624-3974.
> 
> Also I believe that ANSI carries the CISPR Documents.
> 
> There are difference between CISPR 24 and EN55024 ... be careful.
> 
> John Mowbray
> 
> > -Original Message-
> > From: Guy Story [SMTP:gst...@iphase.com]
> > Sent: Friday, September 10, 1999 11:19 AM
> > To:   Emc-Pstc (E-mail)
> > Subject:  CISPR 24
> >
> >
> > Hello everyone.  I am looking for a source for a copy of CISPR 24.  A
> > search on the web ahs not yielded much so I think I am not looking in the
> > right places.
> >
> > Guy Story
> > Compliance Technician
> > Interphase Corporation
> > phone: 214.654.5161
> > fax: 214.654.5406
> > gst...@iphase.com
> >
> >
> > -
> > This message is coming from the emc-pstc discussion list.
> > To cancel your subscription, send mail to majord...@ieee.org
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> > roger.volgst...@compaq.com (the list administrators).
> >
>

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E1 performance spec

[Dwight Hunnicutt]

Is there a spec that is the E1 equivalent of US ANSI T1.403 that
specifies the E1 performance stats ( i.e. ESS, SESS, CSS, etc)?  G.823
doesn't have the performance statistics we're looking for...


D
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  DWIGHT HUNNICUTT   Sr.Compliance Engineer
 
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Re: new legal issues

[Dwight Hunnicutt]

Item #2 would set an interesting precendent...just about every
electronic product on the market has some solder...so everything from
the little beeping, blinking toy imported from Asia, to home theatre
equipment, to your desk phone, fax machine, and pager would need a Prop.
65 warning marking? 


Naftali Shani wrote:
> 
> For those on the frontline: has anyone been exposed to any of these legal
> requirements? Would you mind sharing your experience(s)?
> 
> Regards,
> Naftali Shani, Nortel Networks, Dept. 0S46, MS 117/C1/N04
> 21 Richardson Side Road, Kanata, Ontario, Canada  K2K 2C1
> Voice +1.613.765.2505 (ESN 395) Fax +1.613.763.3365 (ESN 393)
> E-mail: nsh...@nortelnetworks.com 
> 
> -Original Message-
> From:   Ray Alderman [SMTP:e...@vita.com] 
> Sent:   Wednesday, August 04, 1999 15:23
> To: v-...@vita.com 
> Subject:new legal issues
> 
> Hello Members:
> I should make you aware of two new legal issues that you may run
> into in the near future:
> 
> 1. Lemelson Medical, Educational, and Research Foundation holds some
> patents on barcode reading processes, and they are asserting those patents
> on USERS of that equipment (ie, users who barcode their products and read
> those codes). So far, they have targeted grocery stores, distributors, and
> now manufacturers in the elctronics industry. They have granted over 100
> licenses, and over 200 companies have payed hundreds of millions of dollars
> to license them. The patents have not been challenged or litigated. If you
> use bar codes on your products and read them, then you may see these folks
> in your future.
> 
> 2. The State of California statue called Proposition 65 requires that
> manufacturers place a warning label on the containers of products (and the
> products themselves) if they contain harmful carcinogens or chemicals,
> including lead. The solder on your circuit boards constitutes a product
> with toxic exposure potential to both customers and employees.
> 
> The state of California has 90 days to prosecute the manufacturer for
> non-compliance. After that time, private lawsuits can then be placed by
> employees or customers. If you ship products into California, you might
> want to heed this information. They like to get money from outside their
> own economy to fund their latest social programs.
> 
> Now you know.
> 
> Regards...Ray Alderman
> 
> ---
> Ray Alderman   PH: 480-951-8866
> Executive Director, VITA   FX: 480-951-0720
> 7825 E. Gelding Dr. #104   email: e...@vita.com
>   or
> Scottsdale, AZ 85260  e...@busandboard.com
> 
>

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Re: TR-NWT-00406 battery range

[Dwight Hunnicutt]

Tom/Jim-

I do have the SBC TP76200MP document (dated 12/30/98), but I was asking
about TR-406.  Anyone familiar with that document? Is the TR-406
requirement equivalent to this SBC TP76200MP requirement?  thanks

D


Tom Lavka wrote:
> 
> FYI...The most recent revision of TP76200MP is December 30, 1998; However, I
> believe the requirements of section 8 remain unchanged from the July rev.
> Check with SBC to be sure.
> Tom Lavka
> Associate Member Technical Staff
> Copper Mountain Networks, Inc.
> 3931 Sorrento Valley Blvd.
> San Diego, CA 92121
> voice: (619)453-8799 ext. 110
> fax: (619)453-9244
> e-mail: tla...@coppermountain.com
> website: www.coppermountain.com
> 
> -Original Message-
> From: JIM WIESE [mailto:jim.wi...@adtran.com]
> Sent: Thursday, July 08, 1999 5:38 AM
> To: TREG Newsgroup; EMC PSTC; n...@world.std.com
> Subject: RE: TR-NWT-00406 battery range
> 
> SBC requires all equipment to meet the requirements of their TP76200MP
> document dated July 1998.   In Section 8, there is a grouping of tests taken
> from ANSI T1.315-1994 that requires proper operation of equipment from
> -42VDC to -56.5 VDC over the expected life of the equipment.  There is a
> short term requirement for proper operation at -40VDC for one minute and at
> -75VDC for 10mS.  There is a battery drop out test in which the equipment
> must recover and not be damaged when the input battery voltage is 0VDC for
> 5mS.  There is also a requirement to determine at what battery voltage the
> equipment will be damaged (if it can be damaged).
> 
> SBC requires this information in the form of a test report.
> 
> Hope this helps,
> Jim
> 
> Jim Wiese
> Compliance Engineer
> ADTRAN, INC.
> 901 Explorer Blvd.
> P.O. Box 14
> Huntsville, AL 35814-4000
> 256-963-8431
> 256-963-8250 fax
> jim.wi...@adtran.com
> 
> > --
> > From: Dwight Hunnicutt[SMTP:dwight.hunnic...@vina-tech.com]
> > Sent: Wednesday, July 07, 1999 7:48 PM
> > To:   TREG Newsgroup; NEBS Newsgroup; EMC PSTC
> > Subject:  TR-NWT-00406 battery range
> >
> > Anyone been required to guarantee that their equipment must operate
> > "for office battery range as per TR-NWT-000406"?
> >
> > I assume this means your equipment will operate in a DC supply range per
> > TR-406.  Anyone know the range?  thanks
> >
> > D
> > --
> > ___
> >   DWIGHT HUNNICUTT
> >   Sr. Compliance Engineer
> >   VINA Technologies, Inc.
> >

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TR-NWT-00406 battery range

[Dwight Hunnicutt]

Anyone been required to guarantee that their equipment must operate 
"for office battery range as per TR-NWT-000406"?

I assume this means your equipment will operate in a DC supply range per
TR-406.  Anyone know the range?  thanks

D
-- 
___
  DWIGHT HUNNICUTT
  Sr. Compliance Engineer
  VINA Technologies, Inc.

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21" rack for Europe

[Dwight Hunnicutt]

In the U.S., 19" and 23" racks are pretty much the standard (and don't
forget the Bellcore hole spacing), yes?  

How about in Europe?  I've heard they use 19" and 21" racks (or their
metric equivalent).  Is one size typical for data applications, and the
other typical to telecom applications?  How about hole spacing?


-- 
_______
  DWIGHT HUNNICUTT
  Sr. Compliance Engineer
  VINA Technologies, Inc.
  510-771-3349
  520-244-2721 fax
  www.vina-tech.com

HDSL Document needed

[Dwight Hunnicutt]

Anyone know a source for the document "Report 28", a Technical report
prepared by T1.E1.4 Working Group, Digital Subscriber Lines, HDSL, June
1994?

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overvoltage protectors to ground

[Dwight Hunnicutt]

Question regarding "two-legged" vs. "three-legged" overvoltage
protection circuitry: What are the pro & cons of the two? 

Background: Typically, to protect against overvoltages on a telco
interface protection circuit (analog or digital, such as POTS, T1, HDSL,
etc.), one sees either:

1) an MOV/varistor type device across TIP/RING, or
2) two MOV/varistor/gas-tube type devices tied in series across
TIP/RING, with the center connection tied to earth ground.

Of course, there are also typically PTC's or fuses in line for
overcurrent protection.  However, my interest is the pros/cons of the
overvoltage protection topology.

If the interface circuit has no path to earth (typically through
overvoltage protectors), then UL1950/UL1459 allows waiving of the
longitudinal(common) mode overvoltage tests, which makes sense, because
there is no return path for the fault energy.

Since this waiver eliminates about half of the overvoltage testing, why
does one see the "three-legged" topology being used?  Are there some
advantages to shunting energy to earth, rather than just back out the
TIP/RING pair?  Certainly, one has to provide overcurrent protection to
prevent building telco wiring from burning (tested via the MDQ 1-6/10A
fuse), but are there other reasons for preferring a three-legged
approach? What are you missing out on if you elect to use the simpler
topology of just an MOV across TIP/RING?

(To further stir things up, how about if we take into consideration
Bellcore GR-1089-CORE? Does that change things?  I don't believe GR-1089
specifically contains the same waiver as UL1950/UL1459, but certainly
the results are the same, and a test lab should consider waiving for the
same rationale.)

I'm sure many of you have seen both topologies described in application
notes for various interface components, and have had to deal with both.
Any light shed will be appreciated by all.

D
-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


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Re: Excessive smoke

[Dwight Hunnicutt]

Keep in mind that the 28% oxygen index pertains to individual materials
within the equipment (PWB's, etc.), rather than some sort of overall
empirical measurement during the system fire test.

In a nutshell, materials are tested in an oxygen-controlled environment
to see if they will support combustion in a >28% oxygen concentration. 
The idea is that if the materials require >28% oxygen concentration to
combust, the material is considered more fire-resistant, and will
therefore contribute less fuel to the fire.

Dwight 



John Juhasz wrote:
> 
> Good Answer (with respect to the standards noted below).
> 
> However, I would like to expand on this discussion, if I may, with regards
> to
> telecom equipment in a CO (Central Office) environment and meeting Bellcore
> specifications (realize that typically equipment that will go into a CO
> environment will also need to meet UL 19503rd ed.).
> 
> In the case of Bellcore NEBS GR-63, the content of smoke is measured with
> regard to
> 'Oxygen rating index' (should be 28% or greater) during the Fire Resistance
> testing. The previous version of the specification (TR-NWT-63)
> specifically measured all the content of the smoke to determine smoke
> corrosivity.
> Although the current standard (GR-63) is relaxed, the RBOCs (Regional Bell
> Operating Companies - becoming less numerous of late) reserve the right to
> view the video tape of the fire test when considering a product, and if they
> feel that the product is producing too much smoke (regardless of the oxygen
> index) they become concerned.
> They're concerned about bringing down a central office to 'clean' the
> surrounding equipment from the corrosive elements of the smoke.
> 
> So those of you who will also need to meet the Bellcore NEBS requirements
> (telecom equip to be located in a CO) in addition to UL1950 3rd Ed., this
> will be a concern.
> 
> John A. Juhasz
> Product Qualification &
> Compliance Engr.
> 
> Fiber Options, Inc.
> 80 Orville Dr. Suite 102
> Bohemia, NY 11716 USA
> 
> Tel: 516-567-8320 ext. 324
> Fax: 516-567-8322
> 
> -Original Message-
> From: Rich Nute [mailto:ri...@sdd.hp.com]
> Sent: Wednesday, April 21, 1999 2:30 PM
> To: jeff.jenk...@aei.com
> Cc: emc-p...@ieee.org
> Subject: Re: Excessive smoke
> 
> Hi Jeff:
> 
> >   If a component abnormal test generates excessive and sustained smoke
> >   (several minutes), but does'nt breach reinforced or double insulation,
> nor
> >   emit flame from the enclosure, is it considered a failure?  Intuitively,
> it
> >   seems like it would be, because of toxicity, but I have been unable to
> find
> >   anything in the safety standards to support this.  I have checked EN
> 60950,
> >   EN 50178, UL 1012, and CSA C22.2 No. 107.1.
> 
> For the purposes of product safety and compliance with safety
> standards, smoke is a "permitted" emission during fault testing.
> 
> The safety issue is whether a safeguard is damaged or breached
> due to the heat which produced the smoke.  If insulation is not
> damaged (as per the hi-pot test), and excessive heat or flame
> does not breach the enclosure (as per the cheesecloth test),
> then the product is considered acceptable for the purposes of
> product safety.
> 
> Typically, product safety standards do not address the toxicity
> of smoke.  This is because all smoke contains toxic materials.
> The only solution to smoke toxicity is to eliminate smoke, which
> means eliminating all overheating situations.  Which is nearly
> impossible.
> 
> However, any smoke from a product is likely create fear and
> anxiety in the mind of the user and nearby persons.  Any smoke
> in a clean room will likely be cause for scrapping all stock in
> the clean room.
> 
> While smoke always contains toxic materials (e.g., carbon monoxide),
> the concentration of the smoke (toxic material) in the volume of
> the room together with the room ventilation determines whether or
> not inhalation of the smoke is likely to cause an injury.  If the
> volume of smoke is small compared to the volume of the room, then
> it is likely the concentration of toxic material will be below the
> TLV (threshold limit value) for that material.
> 
> So, it is a good idea (for the satisfaction of your customers) to
> eliminate or reduce any significant smoke emissions that might
> occur during fault testing.
> 
> Best regards,
> Rich
>

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French E1 75-ohm spec

[Dwight Hunnicutt]

What's the E1 75-ohm unbalanced standard for France?  Do they have a
National requirement like the U.K. (NTR4)?  Any bizarre differences from
U.K requirements?  Any alternatives? thanks...

D

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


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NTR 4

[Dwight Hunnicutt]

Euro-telecom experts:

Is NTR 4 the same as BS PD 7024:1994  (National U.K. standard for
unstructured E1 75-ohm unbalanced service)?

If not, does anyone know a source for the NTR 4 document?  thanks...

D
-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


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Caller-ID testing

[Dwight Hunnicutt]

Anybody know of a good lab (California?) that does Caller-ID testing
(per GR-30-CORE)?  Our unit generates the Caller-ID information and
sends it on to a station phone, so we need to verify we are sending the
correct signals.   (I don't want to test a Caller-ID phone for receiving
properly, per SR-TSV-002476).

D
-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


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Re: Plugs for China

[Dwight Hunnicutt]

Patrick-

a little plug blade history:

Holes in the exposed part of a plug blade are optional, according to the 
NEMA specification.  They were once used by the large USA Receptacle
mfrs as a method of retaining that plug in the slots.  UL 498 requires
that a receptacle retain a plug when 3 lbs is applied in a direction
tending to withdraw the plug.  A nib on the receptacle contacts mated
with the hole in the blade.  Now, that technology has changed for the
large USA receptacle mfrs, and they do not need the hole in the blade. 
However, every other mfr in the world might still need that old
technology. So the holes are still around in many applications...

Dwight

-- 
DWIGHT HUNNICUTT
Sr. Compliance Engineer


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Patrick Lawler wrote:
> 
> I just looked at a hospital-grade cord, and it had solid, nickel-plated blades
> _with_ a hole.
> 
> Is the hole related to plug retention in the outlet?  I thought I remembered
> seeing small bumps on the mating blades inside the wall outlet.
> 
> On Wed, 21 Oct 1998 08:15:52 -0800, ed.pr...@cubic.com wrote:
> >
> >  From: ed.pr...@cubic.com
> >  Subject: Re: Plugs for China
> >  Date: Tue, 20 Oct 1998 16:06:42 -0800
> >  To: EMC-PSTC , Millsaps Cindy-G14342 
> > 
> >
> >
> >>
> >>
> >> 
> >>   From: Millsaps Cindy-G14342 
> >>   Subject: Plugs for China
> >>   Date: Tue, 20 Oct 1998 16:10:33 -0400
> >>   To: "'emc-p...@ieee.org'" 
> >>
> >>
> >> > It seems that China now requires the plug blades to have no holes in 
> >> > them.  Referring to the small round opening at the upper area of a US 
> >> > plug.
> >>
> >> > Thanks,
> >>
> >> > Cindy Millsaps
> >> > Product Safety Engineer
> >> > Motorola Energy Systems Group
> >> > (770) 338-3288
> >> > FAX: (770) 338-3345
> >>
> >> Sorry, Cindy, I'm of no help on your question. But, can anyone tell me 
> >> just what those little circular holes in the High and Neutral plug blades 
> >> are supposed to do?
> >>
> >And now, another little observation. I looked at some equipment with 
> >Hospital Grade cable plugs. These plugs had solid blades; no holes at all. 
> >And the blades were much more rigid, with slightly larger thickness and 
> >width than a standard plug (subjective, since I didn't have a caliper with 
> >me). I would think that this would create higher contact pressure with the 
> >female socket elements when mated.
> >
> >Also, the blades had what appeared to be a nickel plate finish.
> >
> >Regards,
> >
> >Ed
> >
> >--
> >Ed Price
> >ed.pr...@cubic.com
> >Electromagnetic Compatibility Lab
> >Cubic Defense Systems
> >San Diego, CA.  USA
> >619-505-2780
> >Date: 10/21/1998
> >Time: 08:15:53
> >--
> >
> >
> >
> >-
> >This message is coming from the emc-pstc discussion list.
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> >with the single line: "unsubscribe emc-pstc" (without the
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> >j...@gwmail.monarch.com, ri...@sdd.hp.com, or
> >roger.volgst...@compaq.com (the list administrators).
> 
> --
> Patrick Lawler
> plaw...@west.net
> 
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ESD procedures

[Dwight Hunnicutt]

Any of you ever get handed the responsibility to deploy an ESD control
system for your engineering group?  I'm talking about ESD for our
hardware and test engineers, not the manufacturing folks.  

Just put out the ESD mats and distribute wrist straps, and have a tester
laying around to check straps?  I'm sure there is more to it than
that...any good books to read, or websites to plunder? Any US or Euro
standards to follow for the engineering group (per ISO9001) ?

Dwight
-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


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RENs and dummy loads

[Dwight Hunnicutt]

For you REN experts, any good ideas for making up REN loads for testing
purposes / loading multiple analog lines?

I've heard that a 10K-ohm resistor in series with a 47uF cap gives you 
5 REN (so 2.2K / 10uF series combo equals 1 REN?).  Is this all you
need? Any ideas on making up a switch box for varying REN into multiple
lines? Any suppliers of inexpensive load panels out there?

thanks in advance for your comments...

Dwight
-- 

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Sr. Compliance Engineer


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HALT/HASS Testing

[Dwight Hunnicutt]

In a related area of compliance world, have any of you had experience
subjecting your prototypes to HALT testing, then your production units
to HASS testing (such as by QualMark)??  I'm wondering if this sort of
"accelerated life" testing is something out there for the satellite and
space shuttle designers, rather than for ITE and Telecom equipment
manufacturers.

For those that did do some of this, did you break the bank and use 6
months of your life for this testing, or was it relatively quick and
painless (yeah, right)?

We're considering shaking and baking our telecom unit using these types
of tests as a design verification tool, but one doesn't hear much about
it on the newswire...

Dwight

p.s. HALT - Highly Accelerated Life Testing
 HASS - Highly Accelerated Stress Screening

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


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Re: isopropyl alcohol

[Dwight Hunnicutt]

John-

All that "petroleum spirit" technical jargon translates into good old
kerosene.  That's the solvent the UL lab techs use to conduct the
permanence of marking test for UL1950 (along with a separate test run
using water as the solvent.)

I believe, however, that the original thread of this message dealt with
a non-ITE standard, such as for laboratory or medical equipment.  In
those environments, one might commonly use readily available "rubbing
alcohol" to clean an instrument, therefore the need to test permanence
with isopropyl alcohol.  

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer
VINA Technologies,Inc.  



Crabb, John wrote:
> 
> The requirements in 1.7.15 of UL 1950 are : -
> Compliance is checked by inspection and by rubbing the marking by hand for
> 15 s with a piece of cloth soaked with water and again for 15 s with a piece
> of cloth soaked with petroleum spirit. After this test, the marking shall be
> legible; it shall not be possible to remove marking plates easily and they
> shall show no curling.
> The petroleum spirit to be used for the test is aliphatic solvent hexane
> having a maximum aromatics content of 0.1% by volume, a kauri-butanol value
> of 29, an initial boiling point of approximately 65EC, a dry point of
> approximately 69EC and a mass per unit volume of approximately 0.7 kg/l.
> 
> My recollection is that the sentence beginning "the petroleum spirit" was
> added to CLARIFY
> exactly what should be used.
> 
> It has been suggested to me that doing the test EXACTLY as specified is less
> severe
> than just rubbing with petrol (gas to you). i.e. rubbing with water leaves a
> film of water,
> followed by rubbing with petrol.
> 
> We use a UL Recognized Printing Materials system (PGJI2), where the
> combination of
> label stock, ink ribbon, and printer gives you a label which satisfies UL
> requirements.
> We use a system from Donprint, which also is CSA Certified, and we have
> NEVER had
> UL or CSA carry out any tests.
> 
> As an aside, one of the advantages of buying UL 1950 on disc is that you
> could copy
> the above extract and insert it in an e-mail such as this, rather than
> typing it out.
> 
> John Crabb, Product Safety
> NCR Financial Solutions Group Ltd, Dundee, Scotland.

Re: Majordomo results: Re: odd immunity problems ?

[Dwight Hunnicutt]

of course, the "emi-catchers" lurking in the van would first have to
convince you to leave your ATM card with them so they could carry out
their dirty deed...

Dwight



Douglas Mckean wrote:
> 
> How about ...
> 
> The one where some creative types got some EMI(?) equipment
> to monitor the keystrokes of people at an ATM?
> 
> Story goes that they sat in a van in a parking lot by the
> bank with antennas focused on the ATM.  Once you entered
> in your numbers, they could translate the EMI signature
> to keystrokes on the keypad.  After you left the scene,
> they drained your account.
> 
> Never knew if that was UL or fact.

--

Re: Ce versus FCC

[Dwight Hunnicutt]

good point, Gary.  Only the front end of the switcher would see the
different input voltage and frequency.  The high-speed oscillators on
the motherboards, etc., should not be affected by input
voltage/frequency, yes?

Dwight


Gary McInturff wrote:
> 
> That's interesting. The change from 50 to 60 Hz would change some input
> components and that could effect the input impedance and hence the
> conducted emissions signature but the voltage, especially if its a well
> regulated and filtered supply should be invisible. The components that
> radiate at that point are all of the secondary 5 or 3.3 volt oscillators
> and stuff. They shouldn't even know the difference in the input voltage.
> If using a switcher power supply it seems even more odd. The input
> voltage is rectified and then chopped to "#$@ then more regulating and
> filtering stuff happens. Then it hits the electronics.
> Anybody else see this and have an idea why it might. I may be living in
> a fools paradise here.
> Gary McInturff
> Packet Engines
> 
> -Original Message-
> From:   hmellb...@aol.com [SMTP:hmellb...@aol.com]
> Sent:   Monday, July 06, 1998 11:16 AM
> To: dwight.hunnic...@vina-tech.com; emc-p...@ieee.org
> Cc: eric.lif...@natinst.com
> Subject:Re: Ce versus FCC
> 
> I have encountered certain European agencies requesting that not
> only are the
> conducted emissions required to be performed at 230V 50Hz but
> radiated
> emissions as well. I agree that for conducted emissions it may
> make  a
> difference but I have not seen radiated emissions change when
> the power source
> is changed from 60 to 50 Hz (while keeping Voltage the same). I
> did, however,
> see recently a product change emissions when the voltage was
> changed from 120
> to 230 V. And, it did not matter if it was 50 or 60 Hz, only the
> voltage was
> significant. Go figure!
> Hans

-- 

DWIGHT HUNNICUTT
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Re: Tungsten Halogen Lamp spec's

[Dwight Hunnicutt]

Art-

Take a read through UL's Subject 1950 Industry Bulletin, dated June 10,
1998.  There is considerable discussion of high-pressure lamps; in
particular, consideration is given to using "Contained Atmospheric
Energy (CAE)" in the definition of a high-pressure lamp, rather than
just MPa cold/MPa operating.

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


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Art Michael wrote:
> 
> Hello all,
> 
> I'm presently involved in a decorative lamp project (IEC 60558-1 and -2-4)
> which utilizes a 24 Watt, 12 Volt tungsten-halogen lamp.
> 
> The question is:  What is the definition of high pressure and low pressure
> with respect to tungsten halogen lamps, as defined in IEC 60357, Paragraph
> 9.1   ???  (I'm reluctant to purchase the standard for this one bit of
> information)
> 
> ThanX, Art Michael
> 
> A.E. Michael, Dir. of Engineering
> Product Safety Int'l
> 166 Congdon St. East, Dept. PSTC
> Middletown CT 06457-2107 U.S.A.
> 
> Phone  :  (860) 344-1651
> Fax:  (860) 346-9066
> Email  :  p...@connix.com
> Website:  http://www.safetylink.com

Re: Ce versus FCC

[Dwight Hunnicutt]

Eric-

You tossed in one line that brings up a parallel question for Europe:

> Note that the FCC expects conducted emissions to be
> measured at 115 VAC, 60 Hz.

Has your experience indicated that all Euro EMC directive
(emissions/immunity) testing be conducted at 50Hz?  Many local EMC labs
do not have 50Hz readily available... 

Has anyone run into a problem with a European customer or agency
insisting on 50Hz?

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


**
*  (510) 413-1349 direct   *
*  (510) 492-0808 fax  *
*  VINA Technologies,Inc.  *
*  42709 Lawrence Place*
*  Fremont, CA  94538  *

ovens

[Dwight Hunnicutt]

Anyone have good experience with a small, benchtop-type oven?  Like the
Blue M "MO Series", or others?  Just looking around for a small oven to
do some elevated ambient testing on a rack unit, and don't really want
to spend $10K on a fancy unit.

(Anyone have a used chamber they want to unload?)

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


**
*  (510) 413-1349 direct   *
*  (510) 492-0808 fax  *
*  VINA Technologies,Inc.  *
*  42709 Lawrence Place*
*  Fremont, CA  94538  *

Re: isolation of TO-220 package

[Dwight Hunnicutt]

Edward/Doug/et.al.-

Any sources for those special clips?  I've seen metal spring clips
also...

And how about sources for the grey insulating sleeving/tubing that slips
over the entire TO-220 package, providing insulation and good thermal
transfer, and allowing use of a metal clip?  The sleeving would of
course have to be 94V-2 or better...

Dwight

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer
VINA Technologies,Inc.



POWELL, DOUG wrote:
> 
> Moshe,
> 
> I also have used an number of TO-220 transistor packages.  In the past to
> get the isolation I used thin ceramic substrate.  Several things were done
> to provide the 1.5 MM required.  1) a shoulder washer was used on the screw,
>  2) there was a counter-bore in the heat sink to provide a little extra
> creepage as the substrate was only 1mm thick.   On occasion we have tried
> kapton film but European standards require either multiple layers or 0.4mm
> thickness.  Also the kapton is not puncture resistant to the edges of the
> transistor.
> 
> My favorite solution is the use of a substrate with no holes drilled, and a
> plastic clip is shaped like a "U" bracket with one leg shorter and the other
> with an angled foot. The clip legs were about  8 mm square. The leg with the
> angled foot receives a screw and as the screw is tightened pressure is
> transferred to the transistor body.  The transistor side of the bracket is
> shaped to hold the transistor captive and prevents a compromise in creepage
> and clearance.  I have also used this successfully with thermal switches
> mounted to copper bus bars.
> 
> I know the group does not like graphics to be embedded in email so if you
> would like a sketch please let me know which graphics format you prefer.
> 
> One last choice was more difficult to achieve.  We used TO-220 style
> resistors and by using a diamond saw were able to section several and show
> that the 0.4MM of solid dielectric was provided to the metal tab.  However
> my inspector requires an impulse test on a component in every shipment we
> receive.  IEC 664-1 recommends
> 2.5 kV for our application.  Some parts had to be removed from our
> authorized vendor list for the part as they did not withstand the test (i.e.
> no breakdown, punch-thru, flash-over, etc.).
> 
> Doug Powell
> Compliance Engineer
> Advanced Energy Industries, Inc.
> Ft. Collins, Colorado USA
> 
>  --
> From: moshe_valdman_at_isr-rhv...@mail.nsix.co
> To: emc-p...@ieee.org
> Subject: isolation of TO-220 package
> Date: Monday, June 08, 1998 4:32AM
> 
> Hello everyone,
> 
> The following problem has probably several solutions, some of which I've
> seen
> implemented in power supplies.
> 
> PROBLEM:
> In many applications the metal part of the TO220 package (that's the square
> with
> metal backing and 3 legs in a row) is (or should be considered) under "live"
> voltage. At the same time, for thermal reasons, it is required that this
> metal
> be coupled to the best heat sink around = chassis. This obviously creates a
> problem of isolation, which seems to be solved by using a thermally
> conductive
> isolator sheet between the transistor and the chassis heatsink.
> However, if a screw, which passes through the hole in the TO 220 package is
> used
> (even if it is a plastic screw) then creepage requirements cannot be
> maintained
> (because the insulator is very thin).
> Solutions I saw to this problem are based on not using the hole and pressing
> the
> transistor to the heat sink by other means.
> 
> I would be grateful for any suggestion on how to solve the problem: cool the
> TO
> 220 through the chassis while maintaining at least 1.5 mm (possibly more for
> reinforced insulation) creepage between TO 220 and chassis.
> 
> Thanks
> Moshe Valdman

Re: Coated Printed Boards

[Dwight Hunnicutt]

Alan-

Don't forget that immediately above every PWB trace there is an air gap
to be considered... voltages can flashover through the air above
traces...

Dwight

 

Alan Booth wrote:
> 
> Dear Treggers,
> 
> I am having a problem with clause 2.9.5 of EN60950 regarding Coated
> Printed Boards.
> 
> The second paragraph, second sentence reads :
> 
> 'Between any two uncoated conductive parts and over the outside of the
> coating, the minimum distances in tables 3, 4 or 5 apply.'
> 
> Tables 3, 4 and 5 only deal with clearance distances. I would have
> thought that table 6 for creepage was a more appropriate application in
> this instance.
> 
> Can anyone explain the reasoning behind this?
> 
> Many thanks,
> 
> 
> Alan Booth.
> 
> Equipment Engineering Group
> Fujitsu Telecommunications Europe Limited
> Solihull Parkway
> Birmingham Business Park
> Birmingham
> B37 7YU
> Telephone +44 121 717 6492
> FAX +44 121 717 6014/6018
> e.mail- a.bo...@ftel.co.uk

-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


**
*  (510) 413-1349 direct   *
*  (510) 492-0808 fax  *
*  VINA Technologies,Inc.  *
*  42709 Lawrence Place*
*  Fremont, CA  94538  *

[Fwd: GS Requirements]

[Dwight Hunnicutt]

Volkhard replies:

Volkhard Delfs wrote:
> 
> I have not yet dealt with with DIN 0848 part2/-4 nor with ENV50166-1, -2,
> but perhaps you should approach to the german association of electrical
> engineers the VDE. This group together with the german institute of norms
> (DIN) creates german electrical (emc, safety etc.) norms or prepares the
> adaptions of european standards. The homepage of VDE is www.vde.de.
> By the way, you must not comply with the GS requirements. GS is somewhat of
> a "quality label". It means "Gepruefte Sicherheit" or approved safety. TUV
> makes a business out of this, as you have to pay license fees if your
> product bears that label. Of course you can be confident to match the
> applicable safety standards if you apply for GS-mark, but basically you
> only have to act in accordance with the applicable laws or EC directives
> (typically the EMC directive, Low Voltage Directive etc.).
> Best regards

--

Industry Canada filing software

[Dwight Hunnicutt]

Thanks to those who replied concerning my request for FCC Form 730
instructions (Vic, Jack, et.al.)  Bill vonAlven himself (as busy as he
is at this time) even picked up the message thread, and will drop me a
copy.   Best wishes to Bill as he enjoys a much-earned retirement. 
Do I hear a second to this motion?

Now, how about Industry Canada?  Do they have their filing software
posted on the web somewhere, or do you have to call/write/email them for
a disk?  Was this software another Albuquerque freebee?  I'm told the
Ind. Can. filing is much simpler than our FCC Form 730...


-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


**
*  (510) 413-1349 direct   *
*  (510) 492-0808 fax  *
*  VINA Technologies,Inc.  *
*  42709 Lawrence Place*
*  Fremont, CA  94538  *

FCC Form 730 instructions

[Dwight Hunnicutt]

What's the quickest way to get a copy of the Instruction Book for
completing FCC Form 730?  Is it residing somewhere on the web? Does the
government sell it?  Or does one only get it at Albuquerque?
-- 

DWIGHT HUNNICUTT
Sr. Compliance Engineer


**
*  (510) 413-1349 direct   *
*  (510) 492-0808 fax  *
*  VINA Technologies,Inc.  *
*  42709 Lawrence Place*
*  Fremont, CA  94538  *