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MSIB Cable Pinout

Question asked by petepdx on Dec 21, 2007
Latest reply on Jul 13, 2012 by ja6xkq

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,What are the pinouts for the MMS MSIB cables ?

Until I can obtain some, I need to make up a couple.

TIA ..

-pete

PS I know that some (all?) of the signals are diff-
twisted pairs, low capacitance, metric screws, etc.

No one else has this question

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dhamilton Feb 4, 2008 1:18 PM
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"
,What are the pinouts for the MMS MSIB cables ?

Until I can obtain some, I need to make up a couple.

TIA ..

-pete

PS I know that some (all?) of the signals are diff-
twisted pairs, low capacitance, metric screws, etc.
"

Here is a company that make these cables at a very reasonable price.

http://www.glkinst.com/
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jborges3 Oct 23, 2008 2:07 PM
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I just ran across this thread as I was searching for the same thing. Once I found it I decided to come back here to post it because I'm such a nice guy

I know you probably figured something else out by now, but since people can still turn this thread up in web searches I figured better later than never.

I'd recommend buying a cable vs making one if at all possible. I was looking for the pin out to test a cable that I think might be bad.

Best regards,
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- MSIB cable pin out.pdf20.8 KB
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sr75pro Oct 25, 2008 12:43 PM
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Hi,

Thanks for the effort. But I am not sure that the original poster would be happy if he tried to build a cable. They are not simple straight-trough connections between the male and female end.

I have not tested the wiring of my cables but I know for a fact that the mainframe signals an MSIB error (lights I/O check) if you only plug one end of a cable to the in or out MSIB connector. Note that a loop between these connectors can be made without complain (it is meant to test cables).

So I guess there may at least be a wire bridge or resistor between two pins of the same connector.

Or something more clever. Heck, you could even use TDR techniques to detect unterminated lines. :P

Anyway, I'd like to get the whole book you extracted that page from.

Best of luck to petepdx.

Sylvain
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petepdx Jan 28, 2009 2:46 PM
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but may soon need longer ones, want to put the 70001 about 5 feet
from the display ..
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ja6xkq Jun 11, 2011 8:00 PM
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I have a 70800B MSIB Cable, but need to make another cable.
Then, I disassembled the original cable and confirmed the pinout as below.

1. Pin #16(GND) and #35(CABLE) are tied (jumper) at each connector ends.
2. Cable outer shield is tied to Pin #19(CGND).
3. Other pins are connected in straight-through manner by "twisted pare".
Pairing are: (1,20) (2,21) (3,22) ... (15, 34) (17,36) (18,37)

As you can see in the pin assignments, it seems the signals are differencial.

Pay attention to mechanical aspect also. The screws are in metric.
Use thin (less than 16.5 mm) connector-cover, or thick cover interfares
with neighbor MSIB connector.

My homemade cable does work in 71210C MMS Spectrum Analyser without
problem.

This is a old topic, but hope this may help.

Yoshi
ja6xkq
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- hafrse @ ja6xkq on Jun 5, 2012 1:54 AM
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  Hello,
  
  Did you use twisted pair cables or standard ?
  SM5TAO
  Thanks
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  - ja6xkq @ hafrse on Jul 13, 2012 1:16 AM
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    Hi,
    
    I used twisted-pair cable with outer shield.
    I just followed the manner of original cable.
    
    Yoshi
    ja6xkq
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MSIB Cable Pinout

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