4.2 Central Control Board
This board contains all circuitry to control the fully
equipped KSU. There is an internal connector
between the main PCB and the Central Control
Board. The Central Control Board contains:
• An 8088-compatible 16-bit microprocessor
• 512 Kbyte ROM chip containing system software
• 128 Kbyte CMOS RAM with battery backup
• Interrupt controller
• Time slot interchange circuit
• Digital conference circuit
• System heartbeat indicating red LED
• System timing circuit and PCM frame timing circuit
• CPU/RAM reset switch for initialization
4.3 Auxiliary Board
This board contains circuitry for connecting to exter-
nal input and output devices (music source and pag-
ing equipment).
5. Optional System
Components
5.1 3x8 Expansion Board
One 3x8 Expansion Board may be installed in the 3x8
KSU to expand the system to a maximum capacity of
6 lines and 16 digital extensions.
5.2 Analog Adapter
Analog Adapters can be connected to any of the digi-
tal station ports.
5.3 Station Instruments
Protegé® 616 supports the Business with Display
and Business without Display keysets. Additionally
the 616 system works with single-line phones, fax
machines and voice mail systems that must be con-
nected to the 616 KSU via an analog adapter.
6. Optional Equipment
6.1 Music on Hold/Background Music
Radios, CD players, tape players and other audio
sources can be connected to the external music port
on the KSU. The external source is mono and the
impedance must be 600 ohms to match the input
impedance of the external music port.
Note:
Broadcast music sources are subject to copyright
restriction.
6.2 Voice Mail
Commercial voice mail systems can be attached to an
analog adapter port. The interface requirements for a
voice mail system are the same as those for an indus-
try standard single line phone.
6.3 Fax
Commercial fax equipment can be attached to an
analog adapter port. The interface requirements of a
fax system are the same as those for an industry stan-
dard single line phone.
6.4 External Paging
The 616 KSU provides a single paging port. It has an
output impedance of 600 ohms. If an external paging
unit is connected to a Protegé® system, its input
impedance also should be 600 ohms to match.
Matching impedances ensures maximum output
from the pager and noise free operation. The page
port output is 0 dBm.
6.5 Power Failure Transfer
Power failure transfer provides a bypass for outside
line calls during power failure with no backup bat-
teries or after the backup batteries have been
depleted. This is a hardwired feature. The system
automatically switches the first line to an optional
dedicated analog telephone connected to the 66M1-
50 block. During Power Failure Transfer, incoming
calls on line 1 only ring at this analog phone. The
phone also may be used to place outgoing calls for
assistance.
7. Station Instruments
The Business with Display and Business without
Display digital keysets are available for use on the
Protegé 616. These models make the extensive collec-
tion of features easier to use. In addition to the two
keysets, Protegé 616 works with single line phones
and other analog devices such as fax machines,
modems and voice mail systems that must be con-
nected via an analog adapter.
2-4
P
ROTEGÉ
® 616 I
NSTALLATION AND
M
AINTENANCE
M
ANUAL
, F
EBRUARY
2001
