RE: [SI-LIST] : Gigabit cable assembly

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From: Knighten, Jim L (JK100005@exchange.SanDiegoCA.NCR.COM)
Date: Thu Jul 20 2000 - 09:13:57 PDT


Sunil,

My company has a 1.0625 Gb/s link from cabinet to cabinet. We chose the
Micro-D Subminiature by UltiMate along with a one piece backshell can for
EMI. This choice was made a couple of years ago, prior to the second
generation HSSDC style. The Micro-D is not impedance matched for either our
application (150 Ohms) or yours (100 Ohms) in that its differential
impedance is near 90 Ohms. It is smaller than the original HSSDC. It has
EMI characteristics which are superior to the HSSDC and we find that we are
able to operate our links for a few tens of meters without difficulty.

As we look forward to 2.5 Gb/s and beyond, I don't think our connector will
be satisfactory for the signal, however.

Jim
________________________________________________________
Dr. Jim Knighten e-mail: jim.knighten@ncr.com
<jim.knighten@ncr.com>
Technical Consultant - Design
NCR
17095 Via del Campo
San Diego, CA 92127 http://www.ncr.com <http://www.ncr.com>
Tel: 858-485-2537
Fax: 858-485-3788

                -----Original Message-----
                From: Sunil Kumar [mailto:sunilb@cdotb.ernet.in]
                Sent: Thursday, July 20, 2000 1:56 AM
                To: si-list@silab.eng.sun.com
                Subject: [SI-LIST] : Gigabit cable assembly

                Hello everybody.

                In my application, 1.5Gbps links have to be taken from one
cabinet to
                the other. There are sixteen links taken from one card
(cabinet) taken to
                another card (cabinet). The connectors for these sixteen
duplex links
                have to be accomodated over a length of 8 inches of board
edge. I am
                thinking of using copper cables. Multiple high speed right
angle
                connectors will be used on the board. The length of the
cable
                will be less than 5 meters. As the connectors have to
mounted on the front
                side of the board, I can not use the backplane connectors:
VHDM, Metral
                etc. The connectors which I know are DB9 and HSSDC. But the
problem is
                they are too big for my application. I don't have space to
put multiple
                connectors of any of these types. Can anybody please suggest
me a smaller
                connector and the corresponding cable assembly?

                Thanks

                Sunil Kumar Bahuguna PH: 91-80-2204616
                Research Engineer Fax: 91-80-2263256
                ATM Group Email: sunilb@cdotb.ernet.in
                Switching BII
                C-DOT
                Sneha Complex
                71/1 Millers Road
                Bangalore-560052
                Karnataka
                INDIA

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