15(57)
Date Rev
DocumentnumberPrepared
Doc respons/Approved Checked File/Reference
1999-07-15 V
1531-BDV 113 08 Uen
INSTALLATION INSTRUCTION
Subject responsible
5.4 BTU-A (ROF 157 5110/_) and
BTU-A2 (ROF 157 5120/_)
On delivery from the factory both contacts are in the
OFF position, and the line is a normal trunk.
When both contacts on a DIP-switch are set to position
ON, the line is to be regarded as a music source input.
Different contact positions are not allowed.
Note: Only lines 4 - 7 can be used as a music source
input. Not available on BTU-A subequipped
ROF 157 5127/_.
Add range data information on levels
5.5 Power failure circuit (PFC)
In the event of mains failure and if no back-up battery
is connected to the PBX, a relay on the BTU-A and
BTU-C (see under BTU-C on next page) board auto-
matically switches the trunk lines (generally 2) to ana-
logue telephones, if connected to this board.
If an ELU-A board is installed these telephones can be
used during normal operation and in case of power
failure they will be automatically connected to the pub-
lic exchange.
85
86
87
88
The DIP-switch is shown
with both contacts in
OFF position
Line 4
Line 5
Line 6
Line 7
ON
1 2
26
28
30
32
C
18
20
22
24
A
LA0
Connection field 6
LA1
LB0
LB1
LA2
LA3
LB2
LB3
LA4
LA5
LB4
LB5
LA6
LA7
LB6
LB7
Line wires for
connection to
Public Exchange
*)
*)
Not available on sub-equipped board see below
Indicator
BTC
BTU-A & BTU-C1
La
Lb
a
bPFb
PFa
ELUA
Trunk
Power failure set
Relay shown in power fail position
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