connected. Usually, the MDF is 3/4 inch wooden
backboard securely mounted to a wall in the utility
closet or other isolated space where the switching
equipment is to be installed.
To mount the MDF on a wall, be sure to obtain a
backboard large enough to accommodate the 66M1-
50 terminal block, the KSU and any optional equip-
ment that must be close to the KSU or MDF. The
recommended material for backboards is A/C ply-
wood.
Attach the backboard securely to the wall with
pan or hex head screws appropriate to the wall con-
struction (wood screws for wood studs, self-tapping
sheet metal screws for metal studs). Use screws not
less than 3.5 inches in length. Insert washers on the
screws to reinforce the backboard. Center backboard
mounting screws on wall studs, use drywall or other
substrate anchors and increase the number of screws
used to attached the backboard.
Attach the 66M1-50 terminal block to the back-
board for terminating station wiring, CO lines and
KSU connector.
For details on 66M1-50 block connections see
“Station Cabling” in this chapter.
2. Installation
2.1 Unpack and Inspect Cabinet
1) Remove the KSU cabinet from its packaging
and place on a level surface.
2) Inspect the cabinet for any damage that might
have occurred in shipping and for loose or
missing components.
Warning:
Printed circuit boards can be damaged by static
discharge. Take precautions to protect the KSU during
handling.
The preferred static protection device is a grounded wrist
strap worn at all times while handling the KSU. For max-
imum effectiveness, make sure that the cabinet is grounded
properly.
Avoid touching the electrical contacts on the boards. A
static discharge on the Central Control Board may reset
the 616 system.
3-3
P
ROTEGÉ
® 616 I
NSTALLATION AND
M
AINTENANCE
M
ANUAL
, F
EBRUARY
2001
EPROM Chip
External Paging
Music on Hold
Music / Paging Board
Amphenol Connector
616 Board
Central Control
Board
Figure 3 - 1: Protegé® 616 Key Service Unit Central Control, Paging and 3x8 interface boards.
J1 ribbon cable connecting
Central Control and 3x8
Interface Boards
