CABLES TO CONNECT THE SECOND-LEVEL DISABLE INPUTS TO THE FSTD
    SECOND-LEVEL DISABLE INPUTS
===============================================================================

    When a  2nd  Level  Disable (All  Nodes in  Queue  Busy)  signal enters the
framework through the M101 Patch Panel, it must be distributed to the
associated FSTD card. This is done using two harnesses made from twisted-pair
cable. On one end of each harness is an AMP 34-contact header (32 contacts are
used). On the other end of each harness are 4 AMP 8-contact headers, one header
per FSTD card. These are then plugged into the 2nd Level Disable inputs on the
back of the FSTD. They are loaded in the standard way, with red on top.
 
   
    CABLES TO CONNECT THE FRONT-END BUSY DIGIMEM CARD OUTPUTS TO
    THE FSTD SPECIFIC TRIGGER DISABLE INPUTS
===============================================================================

    When a front-end unit is busy, it  is necessary to disable all Specific
Triggers that would  result in a Start Digitize  signal for that unit. This
is done using a DIGIMEM card matrix  that is programmed with the inverse of
the Specific Trigger to  Start Digitize signal  DIGIMEM matrix. That is, if
the input to this DIGIMEM matrix is Front End Busy signals, the output will
be the Specific Triggers to be disabled. 

    These  signals are  gathered  up in  two AMP 34  Contact  Housings (one
housing for Specific Triggers 1-16, the other housing for Specific Triggers
17-32). These plug into a 64-pin connector in the Patch Panel in rack M101.
This is exactly like the Start Digitize DIGIMEM-to-TLM connection (also two
34-pin housings plugged into one 64-pin connector). The bits are in reverse
order  (Specific  Trigger  1  disable is on  pins 63  and 64  of the 64-pin
connector).  However, they  are in correct  order and  polarity on the back
side of the patch panel. From the back of the Patch Panel, the signals will
be distributed  to the Aux  Disable 1 input  of each  Specific Trigger FSTD
card by twisted pair cables. Also, another 64 pin header on the Patch Panel
is wire-wrapped  to the straight  through header.  This extra header is for
the  purpose of  reading the  Specific  Trigger  Disable  Signals using the
Auxiliary Data IMLRO. A  twisted-pair ribbon  cable connects this header to
bits 33-64 of the Auxiliary Data IMLRO.