DC
I
TABLE 1: MAIN EQUIPMENT
BOARD
BOARD
CODE
DESCRIPTION
STANDARD BOARDS (MUST BE EQUIPPED)
ECPB-A
CENTRALPROCESSORBOARD
This board has the main CPU and
ROM containing the operational
programme.
ECMB-A
CENTRAL MEMORY BOARD
ECMB-B
Contains memory for site
ECMB-D
dependent data and abbrievated
dial numbers.
EDTB-A
TRANSMISSION BOARD
key data between the
equipment and stations.
‘On the EDTB-B (N616 only) a DSS
EDTB-B
port is provided.
EICB-A
INTERCOM CONTROL BOARD
Controls voice switching for up to
Intercom links. If there are
than 4 links required an
expansion board must be used.
E
P F B
-
A
‘POWERFAIL BOARD
board transfers a maximum of
exchange lines to predetermined
stations when there is a power
This board must be equipped
if no powerfail stations are
BOARDS
MAXIMUM QUANTITY PER SYSTEM
N 1 2 3 6
N 2 2 6 0
N 6 1 6
1
1
1
N.A.
1
N.A.
1
N.A
N.A.
N.A.
1
N.A.
1
1
N.A.
1
N.A
1
1
1
2
4
used.
TONE AND SENDER BOARD (VF)
This board contains tone generators
for internal tones and audible
signalling. This board also provides
VF signalling for all exchange lines
up to the maximum system size.
TONE AND SENDER BOARD (DECADIC)
This board contains tone generators
for internal tones and audible
signalling and a microprocessor which
controls decadic signalling on exchange
lines. This unit controls decadic
signalling for up to 16 exchange
lines.
TONE AND SENDER EXPANSION
BOARD (DECADIC)
Contains a microprocessor which
controls decadic signalling on exchange
lines. This board is used to control
decadic signalling on an additional ten
exchange lines and must be used with the
ETSB-B board.
STATION INTERFACE BOARD
This board provided interfaces
for four stations
ETSB-A
1
1
ETSB-B
1
ETSB-C
N.A.
N.A.
1
4
(max.)
9
(max.)
ESTB-C
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ISSUE 2