| Title: | FDDI - The Next Generation |
| Moderator: | NETCAD::STEFANI |
| Created: | Thu Apr 27 1989 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 2259 |
| Total number of notes: | 8590 |
Does anyone have the pinout for the DEFTA-UA and the DEFPA twisted
pair FDDI controllers.
It appears that the two manuals EK-DEFPA-IN A04 page A-4 and
EK-DEFT2-IN A01 page B-2 are in error as far as the cable pinout. They
don't appear to match up to the BN25H or BN26S cables that are called for
in the network buyers guide.
I can not locate either manual for reference. I am going by what a
customer is reading to me. The pinout he is reading me is as follows.
1---3
2---6
3---1
4---5
5---4
6---2
7---8
8---7
This would equate to a BN24F cable, which is for standard twisted
pair not TP FDDI.
I would like to associate signals with the BN25H pinout so as to
see the difference.
Thanks
Ray Hall
CSC-CS Network Support
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1763.1 | TP-PMD Pin-out | SNOFS1::KHOOJEANNIE | Wed Aug 02 1995 00:26 | 22 | |
I believe that for the TP-PMD interface:
pin 1 = tx+
pin 2 = tx-
pin 7 = rx+
pin 8 = rx-
and for the BN25H (TP-PMD Cat 5 cable)
1 --- 7
2 --- 8
3 --- 3
4 --- 4
5 --- 5
6 --- 6
7 --- 1
8 --- 2
Does this help?
Jeannie
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| 1763.2 | confused!! | CSC32::RA_HALL | Thu Aug 03 1995 11:25 | 21 | |
Thanks Jeannie, but now I am really confused. The cable reference
guide that I have shows both the BN25H and the BN26S pinout as follows.
1--8
2--7
3--6
4--5
5--4
6--3
7--2
8--1
If the pinout shown in .1 is correct, and I have no reason to think
it is not, then this means that my cable reference guide as well as the
owner manuals for the products is wrong. I am concerned about the
product owner manuals mentioned in 1763.0. If these manuals are wrong
then we are going to have a lot of customer calls about this. I cannot
verify this as I cannot find the manuals in the center.
thanks
Ray
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| 1763.3 | .1 has correct pinout | NETCAD::MELARAGNI | Thu Aug 03 1995 13:15 | 17 | |
The BN25H and BN26S are pinned out as shown in .1. I have verfied this
via the latest version of the Open DECconect Applications Guide.
The pinout shown in .0 is for 10BaseT. I have seen this error in other
manuals as well.
bill
****
p.s., For those who find tech trivia interesting:
FWIW, the cable pinout shown in .2 *would* work, but it's not "ideal".
TP-PMD can tolerate inverted polarities of TX and RX. That is, If TX+
and TX- are swapped the link will still work. It's the nature of
the line encoding (MLT-3). The other 4 pins (3,4,5,6) are not used by
TP-PMD are are don't-cares.
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| 1763.4 | NETCAD::STEFANI | Machines to humanize | Mon Aug 07 1995 19:24 | 13 | |
Re: .2
Ray,
Please check your copy of the DEFPA manual again to verify that the
pinout matches what's expected. We pulled the pinout from the Open
DECconnect catalog as well as checked with HW engineers like Bill to
verify that it's correct. It's my understanding that the pinouts ARE
correct in the DEFPA manual, so please let me know if you believe
otherwise.
Regards,
Larry
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