System Description Party Line Telephone System PLTS
BCPT1010.SD.E2.doc, Version 1.0
BlueCom AG, 1.3.1999
6
2 Mechanical Design
The bridging amplifiers J3KA are housed in a 19” MES rack R7AH. Up to 8 bridging
amplifiers can be installed in a single rack.
2.1 Interface J3KA
The J3KA module is 3.5 ASA units high and 3 divisions wide. Its mechanical construction
conforms to the ABB MES standard. Each bridging amplifier has its connecting cable V9CT.
The circuitry is arranged on three printed circuit boards which are designated Na, Nb and Nc.
Na is the main board. It is fitted with an edge connector and contains the input testpoints, input
and output transformers and the supply circuits. Nb comprises the amplifiers with the
potentiometers for the gain adjustment. Nc contains the output testpoints.
FRONT VIEW
483 (19")
4-Way
Bridging Amplifier
INPUTS
OUTPUTS
J3KA
1
1
2
2
3
3
4
4
SUPPLY
154
1
4
7
10
11
12
13
16
19
22
23
24
Position:
(3,5 ASA)
REAR VIEW
1
