[SI-LIST] Re: The model of Cat 5 UTP cable
- From: "Patrick O'Shea" <patricko@xxxxxxxxxxxxxxxxx>
- To: <jmartinson@xxxxxxxxxxxxxxxxx>, <julia.nekrylova@xxxxxxxxx>,<si-list@xxxxxxxxxxxxx>
- Date: Fri, 11 Oct 2002 14:16:34 -0700
Jerry & Julia,
If you know the wire diameters, impedance and dB loss, I can make you a
model.
Patrick O'Shea
Director of Business Development
Hytek, Engineering & Manufacturing Services
923 Berryessa Road
San Jose, CA 95133
Direct: 408.727.9770 x 228
Cell: 408.593.3241
www.hytekservices.com
www.hyteksupport.com
----- Original Message -----
From: "Jerry Martinson" <jmartinson@xxxxxxxxxxxxxxxxx>
To: <julia.nekrylova@xxxxxxxxx>; <si-list@xxxxxxxxxxxxx>
Sent: Friday, October 11, 2002 11:56 AM
Subject: [SI-LIST] Re: The model of Cat 5 UTP cable
>
> Julia,
>
> I'm trying to do this too and I'm finding that this is a very complex
> subject (although I didn't think it would be easy). Depending on what
> you want to model, there are a variety of models and methods to use and
> only some are openly described in the literature. There are many types
> of UTP cable installed in the field and they have different parameters.
>
>
> It would be nice if someone had done some sort of modal decomposition
> technique to extract all the parameters of UTP cable, do this to a
> variety of cables that are out there in the field, and develop "corner
> case" cable SPICE models to cover this so that we could simulate to
> them. This is a science project beyond my available resources but if
> anyone knows of an effort to do this that is described in a book
> somewhere, I'd like to hear about it.
>
> I've also heard from a similar post to check out the following book:
>
> Transmission Line Design Handbook (Artech House Microwave Library)
> by Brian C. Wadell. I ordered this but I haven't gotten it yet so I'm
> not sure how well it covers the subject.
>
> There are some models centered around ESD cable discharge that I think
> Rick Brooks from Nortel developed found at:
> http://grouper.ieee.org/groups/802/3/ad_hoc/copperdis/public/docs/cat5_r
> lc.rlc
> http://grouper.ieee.org/groups/802/3/ad_hoc/copperdis/public/docs/
>
> I'm not sure if there are any intellectual property use restrictions on
> using this model - you'd have to double-check this.
>
> Since I don't have access to HSPICE anymore, sometimes I've used this
> for quick, crude approximations for two-wires of UTP but it has a number
> of modeling deficiencies:
>
> .subckt utp_one_foot in1 in2 out1 out2
> x1 in1 in2 1 2 utp_one_inch
> x2 1 2 3 4 utp_one_inch
> x3 3 4 5 6 utp_one_inch
> x4 5 6 7 8 utp_one_inch
> x5 7 8 9 10 utp_one_inch
> x6 9 10 11 12 utp_one_inch
> x7 11 12 13 14 utp_one_inch
> x8 13 14 15 16 utp_one_inch
> x9 15 16 17 18 utp_one_inch
> x10 17 18 19 20 utp_one_inch
> x11 19 20 21 22 utp_one_inch
> x12 21 22 out1 out2 utp_one_inch
> .ends utp_one_foot
>
> .subckt utp_one_inch in1 in2 out1 out2
> r1 in1 int1 0.01
> r2 in2 int2 0.01
> c12 int1 int2 1.42p
> l1 int1 out1 35.5n
> l2 int2 out2 35.5n
> k12 l1 l2 0.4
> .ends utp_one_inch
>
> -----Original Message-----
> From: Nekrylova, Julia [mailto:julia.nekrylova@xxxxxxxxx]=20
> Sent: Friday, October 11, 2002 10:27 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] The model of Cat 5 UTP cable
>
>
> Good Morning,
>
> Could somebody point me to a website or literature source
> where I can find transmission line model of the Cat 5 UTP
> (unshielded twisted pair) cable? You know, you can sometimes run across
> a
> manager
> who would "kindly ask" you to simulate 100 Mbps Ethernet :)
>
> Thanks,
> Julia
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