Karel MS128 Installation & Maintenance Guide
Edition 3.2
12
The dimensions of CPU128 are 26 cm x 21 cm and the weight is 0.3 kg.
The dimensions of MS128 CPUKON are 13 cm x 4.5 cm and the weight is 0.2 kg.
I.5.
EXPANSION MODULES - MS128 EX1 / MS128 EX2
MS128 EX1 and MS128 EX2 modules are used to increase the system capacity.
MS128 EX1 Expansion Module has a capacity of 4/12 whereas MS128 EX2
Expansion Module has a capacity of 0/16.
The system should have at least one MS128 EX1 module to support the minimum
capacity of 4/12. At maximum capacity, the system can have 124 extensions or 20
lines. Hence, by means of the 8 general purpose slots for MS128 EX1 and MS128
EX2 modules, the maximum system capacity may be configured as 4/124 or
20/108, when all slots are occupied.
MS128 has a default numbering plan for extensions from 111 to 234 (max.) and
lines from 01 to 20 (max.). When all the cards are installed and the system is
powered on, the system checks and recognizes all the cards automatically and
arranges the numbering plan accordingly.
MS128 EX1 consists of MS128 EX1B and KN1 cards together with the EX-FC flat
cable. Similarly, MS128 EX2 includes MS128 EX2B and KN2 cards together with
the EX-FC flat cable. MS128 EX1B and MS128 EX2B are the capacity expansion
boards, having extension circuitries as well as bus receiver circuitries. MS128
EX1B cards employ line circuitries as well. See Figure A-8 for the location of these
circuitries as well as Figures A-9 and A-10 for the operational flow diagrams of
MS128 EX1 and EX2 Expansion Boards, respectively.
KN1 and KN2 Connection Cards are the interface boards between the extension
telephones / external lines and the MS128 EX1B and EX2B cards, respectively.
KN1 and KN2 have the extension / line connectors as well as some protection and
filter elements.
KN1 lays on the rack top plate below the top cover of CBN128 cabinet (see Figure
A-3)
.
It is fixed to the rack by a brass card holder with its screw and two plastic
card holders. The KN1 card is connected to MS128 EX1B by a 34-pin flat cable,
called EX-FC. The same also applies to the connection of KN2 and MS128 EX2B.
The pin-outs of the KN1 – MS128 EX1B and KN2 – MS128 EX2B connectors are
illustrated in the following tables.
Summary of Contents for MS128
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