| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 55.1 | Choose ST | HGOVC::RAYMONDSIU | | Wed Apr 18 1990 04:57 | 6 |
|
Specified in DFON, ST (2.5mm Bayonet) connectors will be used
popularly.
Rgds.
|
| 55.2 | ST specified in PMD | AKO569::JOY | Get a life! | Wed Apr 18 1990 17:16 | 4 |
| Also, ST-type connectors are what's specified in the FDDI PMD standard.
Debbie
|
| 55.3 | | KONING::KONING | NI1D @FN42eq | Thu Apr 19 1990 13:08 | 11 |
| No, absolutely not. The PMD spec specifies a connector unique to FDDI.
However, there are standard adapters that accept ST connectors on one
end and an FDDI duplex connector on the other. Also, several vendors
have elected to use ST connectors on the assumption that the customer will
use a patch cord with ST on one end and FDDI duplex on the other.
Also, the ferrule (inner part of the connector) on the ST and FDDI connectors
is the same, which is why the adapters between those two types are easy
to build.
paul
|
| 55.4 | H3114-FA ST or NOT. | GIDDAY::HUTCHISON | A DIGITAL PRO NETWORKER | Fri Apr 20 1990 00:50 | 22 |
| In a well designed and properly installed fibre cable plant the connector is
almost irrelevant to FDDI.
There should be a short patchcord from the trunk cable to the device. This
cable is around 1% of the cost of any FDDI device so it can be easily
exchanged with one that has the appropriate connector on it or alternatively
the old connector could be removed and a compatible one fitted to suit the new
product being installed.
What is more important is that much has been achieved in connector design
since the SMA905, 906 days and the later ST, so ST should be favoured because
of its lower loss and ease of fitting (without the long winded technical
reasons).
It is my understanding that the H3114-FA connectors used in DEC's
implementation of FDDI, are in fact ST's. Although on rereading the
documentation I see it is only refered to as a 2.5mm Bayonet Connector.
Can somone enlighten us as to whether it is different to the ST.
Kevin H.
|
| 55.5 | Same Design/Generic name | LEVERS::KIRK | Dick Kirk | Fri Apr 20 1990 09:30 | 8 |
| Our 2.5 mm Bayonet Connector is *not* called an ST connector because
ST seems to be an AT&T trademark. The DEC connector is compatible
with many ST type connectors. The DFON documentation will list
qualified vendors for our connector.
Dick Kirk
NaC LAN Technology Center
|
| 55.6 | AT&T connector | MQOA02::BARSALOU | Jean Claude Barsalou | Fri Apr 20 1990 13:14 | 6 |
| If you look in the DECconnect Illustrated parts Breakdown
EK-DECON-IP-003, you will recognize the AT&T connector. I was also
told the AT&T connector was Digital's choise among many connectors
evaluated by DEC.
Jean Claude
|
| 55.7 | Stick to Standards | SHAPES::BILLERSB | | Tue May 01 1990 09:52 | 6 |
| The last draft for 10BaseF i saw (FEB 14th) states the connector to be
the 2.5mm connector, IEC equivalent ST1. Maybe you should spec this to
maintain future standards compliance. Take heed of Dick Kirks entry,
there are some rogue connectors around from well known suppliers!
Bob
|