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Conference netcad::hub_mgnt

Title:DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:NETCAD::COLELLADT
Created:Wed Nov 13 1991
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:4455
Total number of notes:16761

1222.0. "need LONG BC16E cable" by VAXRIO::ROLF (Vaporware Design Specialist) Wed Jul 13 1994 15:32

    I need to produce a 50 meter cable to interconnect the managment bus
    between two concatenated HUB90s. I understand the regular cable suggested 
    for this is the BC16E-XX, which comes with a maximum length of 100' (some 
    30.5 meters).
    
    The BC16E uses 6 conductor low speed flat cable (H8240) which I don't
    have. 
    
    Could I use cat. 5 UTP cable, just discarding one pair? 
    
    I am worried about the UTP cable being a TWISTED PAIR CABLE, while
    H8240 is not. Could that cause a problem?
    
    And yes, I know that cable is solid, and the H8220 MMPs aren't REALLY 
    designed for solid wire, but it will work.
    
    Any other suggestion?
    
    Any help appreciated!
    
    Rolf, DEC Brazil
T.RTitleUserPersonal
Name		DateLines
1222.1CAT 5 UTP about the best you can getTOOK::ALBRIGHTBorn to DECserverWed Jul 13 1994 18:319
    Actually, twisted pair could give you better performance.  Take care in
        how you pair the signals.  Putting RxD and TxD on the same pair can
        give you crosstalk problems up the wazoo.  From the MMJ pinout
        standpoint I suggest you pair pins 1-6, 2-3, and 4-5.  I would also
        suggest you not go over 38.4 Kbaud (57.6 Kbaud might work but is
        stretching a little).
    
        Loren
1222.2How about a 1000' spool of BC16EOURGNG::RIGGENBP says wampum from quantum good dealThu Jul 14 1994 18:055
Order a H8240-00  1000' spool of BC16E type cable. then cut to length required
add a Crimp tool H8241-00, and a bag of MMJ adapters H8820-00. 


Jeff
1222.3Permament or temporary?CSOA1::TEATERRCDD - Fight the Good FightFri Jul 29 1994 05:1415
    I assume you will be connecting thehubs with thinwire? So, why not
    configure it using an OPEN DECconnect faceplate, H3111-C, at each end. 
    Use either cat 3 or cat 5 cable, terminate in a H3112-GV 8 pin jack
    (referred to wrongly as a RJ45).  You can terminate the thinwire in the
    H3114-AB connector.
    
    Use BC16M cables to get from the faceplate to the thinwire port at both
    ends.  Use a BN24J-xx at one end and a BN24H-xx at the other end for
    the control lines.  This will create the cross-over the same as a
    BC16E.
    
    The H8240 cable is not suitable in any kind permament installation
    where the cable is not easily replaced (i.e. in ceilings, walls, etc).
    
    greg_t
1222.4THANKS!VAXRIO::ROLFVaporware Design SpecialistTue Aug 02 1994 19:5417
    Well, I used the cat. 5 cable I happened to have a spool of and crimped
    the MMP right on it. The crimping was a bit tricky, because I didn't
    have the right kind of plugs (the ones for solid wire) but it came out
    OK in the end.
    
    Now I just found out that the customer hasn't really got his DECagent90 and
    HUbwatch yet, so he isn't using that cable yet...
    
    The suggestion of -.1 we used some time ago in a remote side, except we
    wired the "behind the wall" cable in crossover manner, so we could use
    the non-crossover cables we had between faceplates and HUBs.
    
    Thanks again for all the suggestions!
    
    Rolf