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Conference 7.286::fddi

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

1212.0. "BN24 MIC to ST cable problem" by GIDDAY::STANISLAUS () Wed Jan 19 1994 14:03

    
    	We are trying to connect a DL3000 (Digital Link's) FDDI to T3 unit
    to a Gigaswitch. We have a BN24D-01 cable whose ST connector (metalic
    type at the ST end) has only a little trouble in connecting on to the
    DL3000's ST connector on the FDDI card. This cable is a bit short so we
    ordered a BN24D-03 longer cable. This brand new cable is of plastic
    type at the ST end. This ST connector is  impossible to lock onto the
    ST connector of the FDDI module on the DL3000 unit. We have just pushed
    the ST connector in but we are unable to turn, in order to lock it. It
    works but why is this plastic shroud so big compared to the older
    metalic shroud on the ST end.
    
    	How do I order one so that I can get the one with the metalic
    shroud.
    
    Alphonse 
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1212.1... need more details !DELNI::ARIVERAFri Jan 21 1994 13:3117
    It sounds like the outer diameter of the ST-connector sleeve is larger
    on the plastic connector than on the metal connector.  Is this correct?
    If this is the case, is the clearance between the connector and the
    panel (or handle) hole small enough to interfere with the plastic
    connector sleeve and prevents it from rotating or locking in ?  If the
    hole clearance is not an issue then either the cable or the component
    on the FDDI card may be defective.
    
    You mentioned having "a little trouble in connecting" the metal
    connector.  Could you please give us some more details on this ?  What
    sort of "trouble" ?  high insertion force ?  high resistance when
    rotating the connector to lock in ?  other ?
    
    Regards,
    
    Alfonso Rivera
    Component Engineer, Fiber Optics
1212.2... regarding ordering metal ST-connectorsDELNI::ARIVERAFri Jan 21 1994 13:5422
    Where did you order these cable assemblies ?  DECdirect ?  ANIXTER ? 
    other ?
    
    Internally to Digital there are several ST-connectors qualified.
    Although I am not the Component Engineer who qualified these
    connectors, I understand the specifications allow for either a plastic
    or metal sleeve.  This means that the same cable assembly could come
    with either connector (which is what you experienced).  Ordering a
    specific connector within one cable assembly normally means there has
    to be different versions available for each connector ... I believe
    this is not the case here.  I recommend you check with the place you
    bought the cables from, maybe they have mechanisms to accomodate
    special requirements.  You could also put together your own cable
    assemblies by getting the (metal) connector kits and the raw cable
    although assembling fiber optic connectors effectively requires
    practice (i.e. this is not like assembling and crimping copper
    connectors).
    
    I am very curious to know if either your cables or the FDDI component
    on the board are defective (especially the latter).  You may also want
    to consult with Dick Kirk on LEVERS::KIRK on the whole problem.  He is
    the Design Engineer responsible for the ST-connector itself.
1212.3NETRIX::thomasThe Code WarriorFri Jan 21 1994 15:042
I've had problem the plastic connector BN24D and DEFTAs.  It took more than
finger effort to lock into place.
1212.4These are cables ordered from DECdirect.140MPH::W_FRANKLINMon Jan 24 1994 16:059
We have some the these cables that just arrived as part of a DECdirect order
and the plastic ends will not connect to a DEFZA and it is a bear to get them
on the connectors on the DEFTA.  If you want you can come to the LAN Certifi-
cation Lab in LKG2-A and have a look.

Bill Franklin
LAN Certification Group
LKG2-A
DTN 226-5228
1212.5I am sure the customers will love this!VASSAR::LEKASFrom the Workstation of Tony LekasThu Jan 27 1994 01:359
We just recieved a DEC3000 with a DEFTA.  It came with cables with the
plastic connector.  We cannot get them onto the DEFTA.  If someone wants to
look at this before I FCO it with my pocket knife, let me know.  The system
is sitting on top of the school cluster in the LKG1-2 LAB.

The problem is that the shroud extends too far from the slots that should
lock onto the pins on the side of the DEFTA end.

		Tony