*****************************
                     *                           *
                     * CTBP TERMINATOR LOCATIONS *
                     *                           *
                     *****************************
                                                        23-MAY-1991 

This file describes  the locations that each  Timing and Sync Signal can
be found on a CTBP Revision B (Tier  1) Backplane. It also specifies the
recommended     positioning for  the   Terminator   Resistors,  both the
board-mounted variety and the single-signal variety.
       

LOCATION OF TIMING SIGNALS AT CARD SLOTS
----------------------------------------

TSS     CARD            J4 Pin numbers
---     ----            --------------
 A      CTFE            65, 33
 B      CTFE            66, 34
 C      CTFE            67, 35
 D      CTFE            68, 36
 E      CTFE            69, 37
 F      CTFE            70, 38
 G      CTFE            71, 39
 H      CTFE            72, 40
 J      CTFE            22, 23
 K      CTFE            24, 25
 L      CTFE            26, 27
 M      CTFE            28, 29

 N      CAT2 MOMENTUM   72, 40
 
 P      CAT2 ENERGY     72, 40

 R      CHTCR           68, 36
 S      CHTCR           69, 37


LOCATION OF TERMINATOR RESISTORS ON BACKPLANE
---------------------------------------------

SLOT    TSS     TYPE            J4 Pin numbers
----    ---     ----            --------------
 27      P      Single          72, 40
 26      N      Single          72, 40
  2     A-H     Board           (ALL SIGNAL PINS)
  2     J-K     Double          22, 23, 24, 25
  2     L-M     Double          26, 27, 28, 29
  1      R      Single          68, 36
  1      S      Single          69, 37

Note that the Terminator Board located at slot 2 also terminates the CA,
FA, STB, DIR, and DATA bits.

A "Board" type terminator is the board containing 32, 110 Ohm resistors.

A "Single"  type  terminator is an  AMP  2-position header  containing a
single  110-Ohm  resistor,  which  has AMP   crimp-contacts  crimped and
soldered on, and the resistor leads are protected with VOLTREX tube.

A "Double"  type  terminator is an  AMP  8-position  header, cut in half
longitudinally to provide 4  positions. These, unline the AMP 2-position
headers, are "end-stackable" in the  required orientation. The resistors
are installed in the same fashion  as a "Single." The header must be cut
in half to prevent interference with both the Backplane Support Bar, and
the "Board" type terminator also mounted at Slot 2.

Note that the two adjacent "Doubles" could be replaced with a "Quad," or
16-position AMP header, again cut in half longitudinally.